uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/818789a882a318c1d7f3fc43a2289e12 David Orwig https://orcid.org/0000-0001-7822-3560 David Foster https://orcid.org/0000-0003-1171-3762 Aaron Ellison https://orcid.org/0000-0003-4151-6081 2023 English

To investigate the forest dynamics across a larger range of scales in which many processes operate, Harvard Forest (HF) researchers, with assistance from the Center for Tropical Forest Science (CTFS) and the Smithsonian Institute’s Forest Global Earth Observatory (ForestGEO), completed an initial census of all woody stems within a 35 ha plot located at the Harvard Forest in 2014. The HF MegaPlot is part of a global array of large-scale plots established by CTFS whose goals are to increase sampling efforts into temperate forests to explore ecosystem processes beyond population dynamics and biodiversity. The geography and size of the HF MegaPlot (500 m x 700 m) is designed to include a continuous, expansive, and varied natural forest landscape. The strategic plot location will yield opportunities for the study of forest dynamics and demography while capturing a large amount of existing NSF funded LTER (Long Term Ecological Research) science infrastructure (e.g. eddy flux towers, gauged sections of a small watershed, existing smaller permanent plots) and a century of observations and studies. The HF MegaPlot will enable an integrated study of ecosystem processes (e.g., biogeochemistry, hydrology, carbon dynamics) and forest dynamics by melding the past with current and future forest research. The second census was conducted during the summers of 2018 and 2019 but did not contain the central swamp portion of the plot.

community composition forest dynamics hemlock hemlock woolly adelgid oak tree maps LTER controlled vocabulary populations disturbance LTER core area Harvard Forest HFR LTER USA HFR default

This dataset is released to the public under Creative Commons CC0 1.0 (No Rights Reserved). Please keep the dataset creators informed of any plans to use the dataset. Consultation with the original investigators is strongly encouraged. Publications and data products that make use of the dataset should include proper acknowledgement.

Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html CC0-1.0 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf253 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.18 -72.18 +42.54 +42.54 340 368 meter 2014 2019 genus Acer species rubrum red maple genus Ilex species verticillata winterberry genus Kalmia species latifolia mountain laurel genus Pinus species strobus white pine genus Quercus species rubra red oak genus Tsuga species canadensis eastern hemlock genus Vaccinium species corymbosum highbush blueberry ongoing Information Manager Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 hf-im@lists.fas.harvard.edu Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu

During March 2010, a professional survey crew delineated a 500m x 700m forest plot with a continuous grid of 20 x 20 m quadrats using a Sokkia SET600 Total Station (Olathe, KS). Each of the 35 vertical columns contained twenty-five quadrats or 1 total ha in area. Half meter steel rods and labeled pvc posts (2.5 cm diam.) marked each of the 875, 20 x 20 quadrat corners and pvc posts (1.25 cm diam.) marked each 10 x 10 subsection. Elevation of each quadrat corner was also recorded using the total station. During the summers of 2010 and 2011 for census 1 and 2018 and 2019 for census 2, all woody stems at least 1 cm dbh were measured to the nearest 0.1 cm at 1.3 m height (called the point of measure or POM) and recorded using methods adopted from Condit (1998). If a stem was irregular or damaged at 1.3 m, then an alternative POM was recorded and used. Individual stems were tagged with uniquely numbered six-digit metal tags (National Band and Tag Company, Newport, KY) and attached to the tree with an aluminum nail angled downward if at least 8 cm dbh or with plastic coated copper wire if less than 8 cm dbh. For multiple-stemmed individuals the dbh of the largest stem was considered the main stem, along with the number and dbh of other stems at least 1 cm dbh. Each stem’s POM was painted with a 2.5 cm by 15 cm horizontal stripe of yellow road paint. Species identification was recorded at the time of measurement. All dead stems at least 5 cm dbh, still standing, and greater than 45 degrees from horizontal were also recorded during this initial census period. The swamp section located in the center of the ForestGEO plot containing dense shrubs was sampled when frozen during the winter months of 2012-2014. Nomenclature follows Haines (2011).

For census 1, each tagged stem was mapped by hand within 10 x 10 m segments of each quadrat by estimating their location to within 0.1 m on a map data sheet drawn to scale with a dot. Each map was then scanned and converted into a jpeg for further analysis. For census 2, all new stems were mapped onto the census 1 maps in the field using electronic field tablets. Using Image J version 1.46, an open-source Java image processing program (Rasband 2012), each dot (stem) was digitized and then converted to local x,y coordinates within a quadrat using R (R Core Team 2013) and the CTFS R package (Condit 2012).

Condit, R. 1998. Tropical forest census plots: methods and results from Barro Colorado Island, Panama and a comparison with other plots. Springer-Verlag, Berlin and R.G. Landes Company, Georgetown, TX. Condit, R., 2012. CTFS R Package. https://forestgeo.si.edu/explore-data/r-package. Haines, A. 2011. Flora Novae Angliae, a Manual for the Identification of Native and Naturalized Higher Vascular Plants of New England. Yale University Press, New Haven, CT. Rasband WS. 2012. ImageJ, U.S. National Institutes of Health, Bethesda, Maryland, USA (imagej.nih.gov/ij/). R Core Team. 2013. R: A language and environment for statistical computing. R Foundation for Statistical Computing. Vienna.

Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu https://ror.org/059cpzx98 pointOfContact The Harvard Forest Long-Term Ecological Research (LTER) program examines ecological dynamics in the New England region resulting from natural disturbances, environmental change, and human impacts. National Science Foundation LTER grants: DEB-8811764, DEB-9411975, DEB-0080592, DEB-0620443, DEB-1237491, DEB-1832210. hf253-01-elevation.csv elevation hf253-01-elevation.csv 33058293 4bedfe039da56388531f2349596ea7b3 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p25/hf253/hf253-01-elevation.csv col.x x coordinate, matching gx of plot coordinate system in Tree and Stem tables, where called gx meter 1 whole NA missing value col.y y coordinate, matching gy of plot coordinate system in Tree and Stem tables meter 1 whole NA missing value col.elev elevation; in some plots, it is absolute elevation above-sea-level, but in other plots, relative elevation meter 0.000000000001 real NA missing value mat.1 matrix of elevation data in format needed by map, image, contour programs. The columns of the matrix are columns in the plot (x dimension), and rows of the matrix are rows in the plot (y dimension). Most plots have elevation recorded over a grid of 5x5 m, so the dimensions of the matrix [dim(elev$mat)] are 1+ydim/5, 1+xdim/5, with the 1 added because the elevation is recorded at all plot edges. Counterintuitively, image and contour functions of R require this matrix be transposed for the map to be right, ie, image(t(elev$mat)) works but image(elev$mat) is a faulty reflection of reality. meter 0.000000000001 real NA missing value mat.2 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.3 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.4 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.5 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.6 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.7 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.8 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.9 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.10 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.11 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.12 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.13 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.14 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.15 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.16 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.17 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.18 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.19 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.20 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.21 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.22 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.23 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.24 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.25 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.26 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.27 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.28 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.29 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.30 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.31 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.32 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.33 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.34 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.35 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.36 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.37 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.38 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.39 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.40 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.41 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.42 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.43 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.44 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.45 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.46 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.47 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.48 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.49 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.50 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.51 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.52 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.53 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.54 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.55 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.56 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.57 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.58 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.59 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.60 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.61 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.62 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.63 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.64 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.65 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.66 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.67 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.68 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.69 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.70 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.71 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.72 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.73 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.74 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.75 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.76 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.77 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.78 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.79 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.80 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.81 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.82 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.83 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.84 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.85 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.86 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.87 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.88 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.89 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.90 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.91 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.92 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.93 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.94 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.95 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.96 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.97 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.98 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.99 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.100 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.101 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.102 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.103 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.104 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.105 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.106 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.107 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.108 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.109 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.110 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.111 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.112 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.113 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.114 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.115 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.116 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.117 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.118 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.119 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.120 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.121 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.122 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.123 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.124 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.125 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.126 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.127 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.128 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.129 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.130 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.131 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.132 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.133 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.134 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.135 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.136 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.137 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.138 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.139 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.140 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value mat.141 matrix of elevation data in format needed by map, image, contour programs meter 0.000000000001 real NA missing value xdim plot x dimension, corresponding to plot and matrix columns meter 1 natural NA missing value ydim plot y dimension, corresponding to plot and matrix rows meter 1 natural NA missing value 14241 hf253-02-species-codes.csv species codes hf253-02-species-codes.csv 5740 8ab6408dd633a821508e26e9beae1337 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p25/hf253/hf253-02-species-codes.csv sp The species mnemonic. Full Latin name can be found in hf253-02-species-codes.csv. This mnemonic is crucial in joining various databases, for instance The Full Tree and Stem tables to the Species tables and Wood Density Table species mnemonic NA missing value latin full genus and species name full genus and species name NA missing value genus genus genus NA missing value species species species NA missing value family family according to APG; Harvard Forest used Haines (2011) for taxonomic nomenclature, and therefore used the following nomenclature for several species mnemonics: viburnum lantanoides was used for vibual, viburnum nudum was used for vibuca, prunus pensylvanica was used for prupe, ilex mucronata was used for nemomu, cratsp and cratxx were combined to cratsp family according to APG NA missing value species.id unique species identifier in MySQL database; seldom needed unique species identifier in MySQL database; seldom needed NA missing value authority taxanomic authority for species name taxanomic authority for species name NA missing value id.level level of identification: can be species, genus, or family; none means no identification at all; multiple indicates that a code includes a mix of more than one species level of identification NA missing value syn synonyms formerly used in the plot synonyms formerly used in the plot NA missing value subsp subspecies name subspecies name NA missing value db database database NA missing value 59 hf253-03-coordinates.csv HF MegaPlot coordinates hf253-03-coordinates.csv 233 96eaf3ec350d0f4716ffa9da73b1bfcb 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p25/hf253/hf253-03-coordinates.csv corner corner of the HF MegaPlot SW southwest corner SE southeast corner NE northeast corner NW northwest corner northing UTM coordinate meter 0.1 real NA missing value easting UTM coordinate meter 0.1 real NA missing value latitude latitude (degrees) dimensionless 1e-08 real NA missing value longitude longitude (degrees) dimensionless 1e-08 real NA missing value 4 hf253-04-trees-2014.csv trees 2014 hf253-04-trees-2014.csv 9699549 53bd19e300a99c0677a265a5ac58f9a6 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p25/hf253/hf253-04-trees-2014.csv tree.id unique tree identifier in CTFS database. Useful to be certain in matching trees. unique tree identifier in CTFS database. Useful to be certain in matching trees. NA missing value stem.id unique stem identifier in CTFS database. Useful to be certain in matching stems. unique stem identifier in CTFS database. Useful to be certain in matching stems. NA missing value tag tag number used in the field tag number used in the field NA missing value stem.tag tag number on the individual stem, if present tag number on the individual stem, if present NA missing value sp The species mnemonic. Full Latin name can be found in hf253-02-species-codes.csv. This mnemonic is crucial in joining various databases, for instance The Full Tree and Stem tables to the Species tables and Wood Density Table species mnemonic NA missing value quadrat quadrat designation quadrat designation NA missing value gx x coordinate within the plot, relative to one edge of the plot meter 0.0000001 real NA missing value gy y coordinate within the plot, relative to one edge of the plot meter 0.0000001 real NA missing value dbh.id unique identifier of a single measurement in the CTFS database unique identifier of a single measurement in the CTFS database NA missing value census.id numeric identifier of the census numeric identifier of the census NA missing value dbh diameter of the stem centimeter 0.000000001 real NA missing value pom point-of-measure, where the diameter was taken, identical to hom, but a character variable with only 2 decimal places. Value is assumed to be at 1.3m, so appears often as 0, which means 1.3m. meter 0.01 real NA missing value hom height-of-measure, identical to pom but a numeric variable with full precision. Value is assumed to be at 1.3m, so it appears often as 0, which means 1.3m. meter 0.000000001 real NA missing value exact.date date on which the steam was measured YYYY-MM-DD 1 day NA missing value df.status status taken from the DFtemp table of the CTFS database: alive, dead, lost_stem, missing, or prior. Alive (A) and dead (D) refer to the entire tree, so if any stem is alive, the tree is alive, and a tree is only dead when every stem is dead. Status = 'lost_stem' indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem. Status = 'missing' (M) are cases where dbh are codes for a tree were not given, so it is not certain whether the tree was alive or dead. Status = 'prior' (P) indicates a tree had not yet recruited at this census. The lost_stem status is now deprecated, since it should always be safer to check stemID to determine whether a tree's measurement changed stems between censuses. alive refers to the entire tree, so if any stem is alive, the tree is alive dead a tree is only dead when every stem is dead lost_stem indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem stem missing dbh codes for a tree not given, so not certain whether tree is alive or dead prior tree had not yet recruited at this census NA missing value codes codes for the measurement as recorded in the field M Multiple: the parent/biggest stem in the multiple L Leaning: a stem that has a significant lean P Prone: stems that are growing parallel to the ground U Uproot: a stem's root ball is partially or fully uprooted. This code might be combined with Prone, if the stem is fully uprooted. B Broken Stem: a stem that has been snapped but is still attached C Crown Dead: a crown that has been defoliated or killed in some other way D Dead: all dead stems over 5cm at DBH get a tag and this code N Dendrometer: the stem has a dendro band attached T Other Tag: there is another tag present on stem. Tag number recorded in comments. Q Equipment: other science equipment is attached to the tree S Dead Re-Sprout: a stem that has sprouted from the roots of a dead stem I Irregular: stems that have misshapen boles. This code is used to help determine C storage. O Broken Top: stems that have the top or large part of the top missing. This code means that the broken piece is no longer attached to the stem. Free text (unrestricted) .* NA missing value no.stems number of living stems on the date of measurement number 1 whole NA missing value jd julian date, for date arithmetic nominalDay 1 natural NA missing value status abbreviated version of status, for compatibility with earlier versions of functions in the CTFS R package A alive D dead M missing P prior NA missing value agb above-ground-biomass of the stem, in Mg (= metric tons or 10^6 grams). Some are NA. agb calculation in this table based on volume allometry published for tropical trees, then uses published wood density for individual species. megagram 0.000000001 real NA missing value 83813 hf253-05-stems-2014.csv stems 2014 hf253-05-stems-2014.csv 13407924 624fdff43a4cc7385b4de61de2f9ae3c 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p25/hf253/hf253-05-stems-2014.csv tree.id unique tree identifier in CTFS database. Useful to be certain in matching trees unique tree identifier in CTFS database NA missing value stem.id unique stem identifier in CTFS database. Useful to be certain in matching stems. unique stem identifier in CTFS database NA missing value tag tag number used in the field tag number used in the field NA missing value stem.tag tag number on the individual stem, if present tag number on the individual stem, if present NA missing value sp The species mnemonic. Full Latin name can be found in hf253-02-species-codes.csv. This mnemonic is crucial in joining various databases, for instance The Full Tree and Stem tables to the Species tables and Wood Density Table species mnemonic NA missing value quadrat quadrat designation quadrat designation NA missing value gx x coordinate within the plot, relative to one edge of the plot meter 0.0000001 real NA missing value gy y coordinate within the plot, relative to one edge of the plot meter 0.0000001 real NA missing value dbh.id The unique identifier of a single measurement in the CTFS database The unique identifier of a single measurement in the CTFS database NA missing value census.id numeric identifier of the census numeric identifier of the census NA missing value dbh diameter of the stem centimeter 0.000000001 real NA missing value pom point-of-measure, where the diameter was taken, identical to hom, but a character variable with only 2 decimal places. Value is assumed to be at 1.3m, so appears often as 0, which means 1.3m. meter 0.01 real NA missing value hom height-of-measure, identical to pom but a numeric variable with full precision. Value is assumed to be at 1.3m, so it appears often as 0, which means 1.3m. meter 0.000000001 real NA missing value exact.date date on which the steam was measured YYYY-MM-DD 1 day NA missing value df.status status taken from the DFtemp table of the CTFS database: alive, dead, lost_stem, missing, or prior. Alive (A) and dead (D) refer to the entire tree, so if any stem is alive, the tree is alive, and a tree is only dead when every stem is dead. Status = 'lost_stem' indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem. Status = 'missing' (M) are cases where dbh are codes for a tree were not given, so it is not certain whether the tree was alive or dead. Status = 'prior' (P) indicates a tree had not yet recruited at this census. The lost_stem status is now deprecated, since it should always be safer to check stemID to determine whether a tree's measurement changed stems between censuses. alive refers to the entire tree, so if any stem is alive, the tree is alive dead a tree is only dead when every stem is dead lost_stem indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem stem missing dbh codes for a tree not given, so not certain whether tree is alive or dead prior tree had not yet recruited at this census NA missing value codes codes for the measurement as recorded in the field M Multiple: the parent/biggest stem in the multiple L Leaning: a stem that has a significant lean P Prone: stems that are growing parallel to the ground U Uproot: a stem's root ball is partially or fully uprooted. This code might be combined with Prone, if the stem is fully uprooted. B Broken Stem: a stem that has been snapped but is still attached C Crown Dead: a crown that has been defoliated or killed in some other way D Dead: all dead stems over 5cm at DBH get a tag and this code N Dendrometer: the stem has a dendro band attached T Other Tag: there is another tag present on stem. Tag number recorded in comments. Q Equipment: other science equipment is attached to the tree S Dead Re-Sprout: a stem that has sprouted from the roots of a dead stem I Irregular: stems that have misshapen boles. This code is used to help determine C storage. O Broken Top: stems that have the top or large part of the top missing. This code means that the broken piece is no longer attached to the stem. Free text (unrestricted) .* NA missing value count.pom number of POMs (HOMs) for the same stem in this census number 1 natural NA missing value jd julian date, for date arithmetic nominalDay 1 natural NA missing value status abbreviated version of status, for compatibility with earlier versions of functions in the CTFS R package A alive D dead M missing P prior NA missing value agb above-ground-biomass of the stem, in Mg (=metric tons or 10^6 grams). Some are NA. agb calculation in this table based on volume allometry published for tropical trees, then uses published wood density for individual species. megagram 0.000000001 real NA missing value 116227 hf253-06-stems-2019.csv stems 2019 hf253-06-stems-2019.csv 12687409 3078211fec57e2b11b3e0ca1c6c01af2 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p25/hf253/hf253-06-stems-2019.csv tree.id unique tree identifier in CTFS database. Useful to be certain in matching trees unique tree identifier in CTFS database NA missing value stem.id unique stem identifier in CTFS database. Useful to be certain in matching stems. unique stem identifier in CTFS database NA missing value tag tag number used in the field tag number used in the field NA missing value stem.tag tag number on the individual stem, if present tag number on the individual stem, if present NA missing value sp The species mnemonic. Full Latin name can be found in hf253-02-species-codes.csv. This mnemonic is crucial in joining various databases, for instance The Full Tree and Stem tables to the Species tables and Wood Density Table species mnemonic NA missing value quadrat quadrat designation quadrat designation NA missing value gx x coordinate within the plot, relative to one edge of the plot meter 0.0000001 real NA missing value gy y coordinate within the plot, relative to one edge of the plot meter 0.0000001 real NA missing value dbh.id The unique identifier of a single measurement in the CTFS database The unique identifier of a single measurement in the CTFS database NA missing value census.id numeric identifier of the census numeric identifier of the census NA missing value dbh diameter of the stem centimeter 0.000000001 real NA missing value pom point-of-measure, where the diameter was taken, identical to hom, but a character variable with only 2 decimal places. Value is assumed to be at 1.3m, so appears often as 0, which means 1.3m. meter 0.01 real NA missing value hom height-of-measure, identical to pom but a numeric variable with full precision. Value is assumed to be at 1.3m, so it appears often as 0, which means 1.3m. meter 0.000000001 real NA missing value exact.date date on which the steam was measured YYYY-MM-DD 1 day NA missing value df.status status taken from the DFtemp table of the CTFS database: alive, dead, lost_stem, missing, or prior. Alive (A) and dead (D) refer to the entire tree, so if any stem is alive, the tree is alive, and a tree is only dead when every stem is dead. Status = 'lost_stem' indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem. Status = 'missing' (M) are cases where dbh are codes for a tree were not given, so it is not certain whether the tree was alive or dead. Status = 'prior' (P) indicates a tree had not yet recruited at this census. The lost_stem status is now deprecated, since it should always be safer to check stemID to determine whether a tree's measurement changed stems between censuses. alive refers to the entire tree, so if any stem is alive, the tree is alive dead a tree is only dead when every stem is dead lost_stem indicates that the stem had the associated code; it usually means the stem was broken in the given census, while the tree had no other stem stem missing dbh codes for a tree not given, so not certain whether tree is alive or dead prior tree had not yet recruited at this census NA missing value codes codes for the measurement as recorded in the field M Multiple: the parent/biggest stem in the multiple L Leaning: a stem that has a significant lean P Prone: stems that are growing parallel to the ground U Uproot: a stem's root ball is partially or fully uprooted. This code might be combined with Prone, if the stem is fully uprooted. B Broken Stem: a stem that has been snapped but is still attached C Crown Dead: a crown that has been defoliated or killed in some other way D Dead: all dead stems over 5cm at DBH get a tag and this code N Dendrometer: the stem has a dendro band attached T Other Tag: there is another tag present on stem. Tag number recorded in comments. Q Equipment: other science equipment is attached to the tree S Dead Re-Sprout: a stem that has sprouted from the roots of a dead stem I Irregular: stems that have misshapen boles. This code is used to help determine C storage. O Broken Top: stems that have the top or large part of the top missing. This code means that the broken piece is no longer attached to the stem. Free text (unrestricted) .* NA missing value count.pom number of POMs (HOMs) for the same stem in this census number 1 natural NA missing value jd julian date, for date arithmetic nominalDay 1 natural NA missing value status abbreviated version of status, for compatibility with earlier versions of functions in the CTFS R package A alive D dead M missing P prior NA missing value agb above-ground-biomass of the stem, in Mg (=metric tons or 10^6 grams). Some are NA. agb calculation in this table based on volume allometry published for tropical trees, then uses published wood density for individual species. megagram 0.000000001 real NA missing value 123218 biodiversity invasive plot long-term measurement https://forestgeo.si.edu/