Overstory Mapped Tree Plots at Harvard Forest since 1990

<para>These plots were established and mapped in 1990 for an experiment designed to study the effects of selective overstory tree mortality. The planned manipulation was to kill and leave standing one species in each of four plots, to simulate mortality by a species-specific pathogen. This manipulation was never done, for logistical reasons and because the appearance of the hemlock woolly adelgid provided a more pressing "natural" experiment to study; however, the plots are maintained and have been used in other studies. There are four 50m x 50m plots, located in a mixed hardwood forest (red oak and maple species are major components), north of the experimental hurricane. Tree data from the control plot of the experimental hurricane study could be added to this set for some analyses, since all the plots are in the same general area and forest type, and similar types of measurements were made on all of these trees. Tree diameter and condition were re-surveyed in these plots in Autumns 2003, 2013 and 2023, and saplings growing into the "tree" size class of greater than or equal to 5cm diameter were measured, tagged and mapped.</para> </section> </abstract> <keywordSet> <keyword>maple</keyword> <keyword>oak</keyword> <keyword>permanent plots</keyword> <keyword>tree maps</keyword> <keyword>vegetation dynamics</keyword> <keywordThesaurus>LTER controlled vocabulary</keywordThesaurus> </keywordSet> <keywordSet> <keyword>populations</keyword> <keywordThesaurus>LTER core area</keywordThesaurus> </keywordSet> <keywordSet> <keyword>Harvard Forest</keyword> <keyword>HFR</keyword> <keyword>LTER</keyword> <keyword>USA</keyword> <keywordThesaurus>HFR default</keywordThesaurus> </keywordSet> <intellectualRights> <section> <para>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.</para> </section> </intellectualRights> <licensed> <licenseName>Creative Commons Zero v1.0 Universal</licenseName> <url>https://spdx.org/licenses/CC0-1.0.html</url> <identifier>CC0-1.0</identifier> </licensed> <distribution> <online> <url function="information">https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf036</url> </online> </distribution> <coverage> <geographicCoverage> <geographicDescription>Tom Swamp Tract (Harvard Forest). Coordinates based on WGS84 datum.</geographicDescription> <boundingCoordinates> <westBoundingCoordinate>-72.20</westBoundingCoordinate> <eastBoundingCoordinate>-72.20</eastBoundingCoordinate> <northBoundingCoordinate>+42.50</northBoundingCoordinate> <southBoundingCoordinate>+42.50</southBoundingCoordinate> <boundingAltitudes> <altitudeMinimum>295</altitudeMinimum> <altitudeMaximum>295</altitudeMaximum> <altitudeUnits>meter</altitudeUnits> </boundingAltitudes> </boundingCoordinates> </geographicCoverage> <temporalCoverage> <rangeOfDates> <beginDate> <calendarDate>1990</calendarDate> </beginDate> <endDate> <calendarDate>2023</calendarDate> </endDate> </rangeOfDates> </temporalCoverage> </coverage> <maintenance> <description> <para>ongoing</para> </description> </maintenance> <contact scope="document"> <positionName>Information Manager</positionName> <organizationName>Harvard Forest</organizationName> <address scope="document"> <deliveryPoint>324 North Main Street</deliveryPoint> <city>Petersham</city> <administrativeArea>MA</administrativeArea> <postalCode>01366</postalCode> <country>USA</country> </address> <phone phonetype="voice">(978) 724-3302</phone> <electronicMailAddress>hf-im@lists.fas.harvard.edu</electronicMailAddress> </contact> <publisher scope="document"> <organizationName>Harvard Forest</organizationName> <address scope="document"> <deliveryPoint>324 North Main Street</deliveryPoint> <city>Petersham</city> <administrativeArea>MA</administrativeArea> <postalCode>01366</postalCode> <country>USA</country> </address> <phone phonetype="voice">(978) 724-3302</phone> <phone phonetype="fax">(978) 724-3595</phone> <onlineUrl>https://harvardforest.fas.harvard.edu</onlineUrl> </publisher> <methods> <methodStep> <description> <section> <para>Each 50m x 50m plot was established with a 10m x 10m grid and all trees of diameter greater than or equal to 5 cm dbh were mapped using a least-squares technique in which inter-tree distances were measured to the nearest centimeter (Boose et al. 1998. Ecology 79:819-827). For each tree, species, canopy position, health, and diameter were recorded. Trees with multiple stems originating from a single base were measured as separate individuals if the stems forked at less than 1.3m high.</para> </section> </description> </methodStep> </methods> <project> <title>Harvard Forest Long-Term Ecological Research 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. hf036-01-tree.csv tree data hf036-01-tree.csv 117421 0e28886188fc90865a18f957f661c19e 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p03/hf036/hf036-01-tree.csv plot 50m x 50m plot 50m x 50m plot tree All trees are tagged in the field with their number. Trees in the original 1990 survey have numbers less than 300. Trees that grew into the 5cm class and were first measured in 2003 have numbers greater than 300. Trees that grew into the 5cm class and were first measured in 2013 have numbers greater than 400. tree numbers species First two letters of genus and species names of tree ACPE Acer pensylvanicum ACRU Acer rubrum ACSA Acer saccharum BEAL Betula alleghaniensis BELE Betula lenta BEPA Betual papyrifera CADE Castanea dentata CAGL Carya glabra CAOV Carya ovata CASP Carya (not identified to species) FAGR Fagus grandifolia FRAM Fraxinus americana OSVI Ostrya virginiana PIRE Pinus resinosa PIST Pinus strobus POGR Populus grandentata PRSE Prunus serotina QURU Quercus rubra TIAM Tilia americana TSCA Tsuga canadensis x Cartesian coordinate identifying location within the plot along its north-south axis meter 0.01 real NA missing value y Cartesian coordinte identifying location within the plot along its east-west axis meter 0.01 real NA missing value can canopy class D dominant C codominant I intermediate S suppressed (or lower stratum) dbh90 Diameter at breast height (1.37m) in 1990 centimeter 0.1 real NA missing value dbh03 Diameter at breast height (1.37m) in autumn 2003 centimeter 0.1 real NA missing value dbh13 Diameter at breast height (1.37m) in autumn 2013 centimeter 0.1 real NA missing value dbh23 Diameter at breast height (1.37m) in autumn 2023 centimeter 0.1 real NA missing value cond90 tree condition in 1990 L living D dead M moribund (will likely die soon) cond98 tree condition in 1998 L living D dead M moribund (will likely die soon) G gone - can't relocate the tree cond03 tree condition in 2003 L living D dead M moribund (will likely die soon) G gone - can't relocate the tree cond13 tree condition in 2013 L living D dead G gone - can't relocate the tree cond23 tree condition in 2023 L living D dead G gone - can't relocate the tree damage93 These observations were recorded after a major winter storm BEND bole bent CRSN bole broken at more than 50% height OLD damage from before 1993 winter storm SNAP bole broken at less than 50% height STND no notable damage UPRT tree uprooted leaf93 These observations were recorded after a major winter storm L4 >90% crown leafed out L3 more than 50% but less than 90% leafed out L2 less than 50% but more than a single branch leafed out L1 only a few leaves or small branches leafed out, or one large branch; less than 10% leafout F false, no leafing out 0 not sure what this means. Usually attributed to trees dead before 1993 basp93 These observations were recorded after a major winter storm T has basal sprouts F no basal sprouts trsp93 These observations were recorded after a major winter storm T has trunk sprouts F no trunk sprouts ht04 the height (in meters) of the tree, calculated from the height percent and the distance at which that was measured in 2004 meter 0.01 real NA missing value crowndepth04 amount of live crown, calculated from height percent-height to base of live crown percent and the distance at which these were measured in 2004 meter 0.01 real NA missing value meancrowndiam04 the average of the major and minor axes of the crown diameter (width), which were determined visually and measured with a 50m tape in 2004 meter 0.01 real NA missing value note90 field notes from 1990 field notes from 1990 note93 field notes from 1993 field notes from 1993 note98 field notes from 1998 field notes from 1998 note03 field notes from 2003 field notes from 2003 note13 field notes from 2013 field notes from 2013 note23 field notes from 2023 field notes from 2023 1097 plot community long-term measurement https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf051