uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/f4e89abef140b70b3e073512ac81007d David Orwig https://orcid.org/0000-0001-7822-3560 Julian Hadley Greta VanScoy Researcher 2024 English

We measure the dry mass and estimated carbon content of leaves and fine twigs that abscise each year. These data are used to quantify one component of annual net primary productivity (ANPP), an important measure of ecosystem productivity and carbon cycling. Leaf area index (LAI) can also be estimated from these data, if area-to-mass ratios are calculated for leaves of each species. This was done for 2002 and 2003 leaf litterfall at the Little Prospect Hill (LPH) site. The fraction of total leaf mass or estimated total leaf area that is formed by leaves of each species also shows the species composition of the forest canopy. If repeated over many years, these data can indicate whether the forest canopy species composition is changing over time.

carbon cycling leaf litter net primary production LTER controlled vocabulary primary production 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=hf151 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.185 -72.180 +42.542 +42.539 355 380 meter 2002 2023 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

Laundry baskets varying from about 40 to 45 cm across were placed in within circular plots in the footprints of the Little Prospect Hill and Hemlock eddy flux towers, in October 2002 for the Little Prospect Hill flux tower site and in October 2004 for the Harvard Forest Hemlock flux tower site. Baskets were placed in 36 plots at the Little Prospect Hill site and 12 plots at the Hemlock site. For a description of the number and locations of these circular plots, please see HF149. The baskets remain in the forest throughout the year and all leaves and fallen twigs are collected each year in November, after completion of the major period of leaf abscission for both deciduous and hemlock-dominated forests. Quarterly (or occasionally 2-3 yearly) collections of litter began for the Hemlock forest in 2012, and litter collections ceased at the Little Prospect Hill site after 2010. The leaf litter is sorted by species, dried at 70 degrees Celsius for two days or longer, and weighed. Twigs, acorns, seed cones, and pieces of litter too small to be identified by species are also separated, dried at 70 degrees Celsius and weighed. Starting in 2020, acorns were lumped in with all other seeds. The total dry masses of leaves and other fallen litter are divided by the cross-sectional area of the mouth of each litter basket to obtain values of mass per unit area. For 2002 and 2003 measurements at Little Prospect Hill, the estimated area of leaves of each species in each litter basket were also divided by the cross-sectional area of the mouth of each litter basket to obtain leaf area per unit ground area, which is leaf area index (LAI).

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. hf151-01-hem-litterfall.csv Hemlock litterfall hf151-01-hem-litterfall.csv 128103 bab91079237c7e1f64e420830bcc798b 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p15/hf151/hf151-01-hem-litterfall.csv year year YYYY month month of collection. Litter was collected once each year from 2006-2011, and quarterly starting in 2012. month dist distance from tower meter 1 whole NA missing value trans compass direction from Hemlock tower from geographic north degree 1 whole NA missing value species species (4-letter abbreviation) or other ID ACORNS acorns ACPE Acer pensylvanicum ACRU Acer rubrum BELE/BEAL Betula lenta and B. alleghaniensis BEPA Betula papyrifera CADE Castanea dentata CONES cones FAGR Fagus grandifolia FERN fern FRAM Fraxinus americana HAVI Hamamelis virginiana MISC miscellaneous MOSS moss NA missing value NYSY Nyssa sylvatica OTHER DECID other deciduous PICEA Picea PIRE Pinus resinosa PIST Pinus strobus POTR Populus tremuloides QUAL Quercus alba QUAL/QURU Quercus alba/Quercus rubra QURU Quercus rubra SEEDS seeds SHRUB shrub TSCA Tsuga canadensis UNK unknown VACO Vaccinium corymbosum WOODY woody WOODY REPRO woody; reproductive NA missing value tot_wt total weight gram 0.001 real NA missing value bask_area area of opening of litter basket squareCentimeters 1 natural NA missing value notes notes notes NA missing value 3367 hf151-02-lph-litterfall.csv Little Prospect Hill litterfall hf151-02-lph-litterfall.csv 89766 3757f360d132b40536cde9ad22decf8b 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p15/hf151/hf151-02-lph-litterfall.csv year year YYYY dist distance from tower meter 1 whole NA missing value trans compass direction from LPH tower from geographic north degree 1 whole NA missing value species species (4-letter abbreviation) or other ID species (4-letter abbreviation) or other ID subsamp_wt weight of subsample gram 0.001 real NA missing value tot_wt total weight gram 0.001 real NA missing value sample_la sample leaf area squareCentimeters 0.01 real NA missing value bask_area area of opening of litter basket squareCentimeters 1 natural NA missing value 2323 plot long-term measurement https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf069 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf149