uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/8086dbebb71dc98ba492345258ca67b7 Peter Bettmann-Kerson Aaron Ellison https://orcid.org/0000-0003-4151-6081 2023 English

As part of the long-term goal of reconstructing the stand and land-use history of the Simes Tract at Harvard Forest, trees were cored from the 8 hemlock and hardwood plots in the Hemlock Removal Experiment. Cores were sanded and growth was measured. The data were used for the 2006 senior thesis (Division III paper) of Peter Bettman-Kerson at Hampshire College ("Dendrochronological reconstruction of historical disturbances in a hemlock forest at the Harvard Forest, Petersham, MA"). This dataset is the raw growth data for 230 trees sampled across the 8 plots.

dendrochronology forest disturbance hemlock land use LTER controlled vocabulary primary production 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=hf086 Simes Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.22 -72.22 +42.47 +42.47 200 240 meter 2004 2006 genus Acer species spp. maple genus Betula species spp. birch genus Ostrya species virginiana ironwood genus Pinus species strobus white pine genus Quercus species spp. oak genus Tsuga species canadensis eastern hemlock complete 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

Stratified random sampling was used to select which trees to core. Trees were divided into five size classes of 11-20, 21-30, 31-40, 41-50 and 51 cm DBH or larger. At least one tree was sampled at random from each size class where available, and the number of trees selected from each size class was decided based on the relative frequency of that size class out of the total number of stems in the plot. Dead trees and trees less then 10cm DBH were not sampled while trees showing enough decay to make the sample unreadable were replaced with an alternate of the same species and size class where available. In plots 2 and 4, which were logged for the HWA experiment, stump-level transverse segments ("cookies") were used when they were available and stumps were cored where necessary to complete the sampling from these plots. In all of the plots, one core was collected from between one-third and one-half of the stems on the site. Cores were collected in July 2004 and October - December 2005, using an increment borer from as close to the ground as possible to maximize the number of years in the sample. Samples were rough-sanded using a random orbit palm sander, after which hard-to-read cores were hand sanded with sand paper up to 380, 660 or 1,200 grains/inch as needed to reveal the rings. In the lab, rings on the tree cores were counted from the bark to the center using a binocular microscope to determine the approximate age of each tree. Decades were marked on the core in pencil. Next the annual radial growth was measured using a Velmex tree-ring measuring system (Velmex 2003) and Measure J2X software (VoorTech 2005) which provided measurements accurate to 0.01mm. Data were converted from Velmex format to tabular spreadsheet format using program FMT from the dendrochronology program library (University of Arizona Laboratory of Tree Ring Research, http://www.ltrr.arizona.edu/).

Harvard Forest

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(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. hf086-01-dendro.csv dendrochronology data hf086-01-dendro.csv 659190 9facb3635198971f54df82085cbc5794 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p08/hf086/hf086-01-dendro.csv plot plot of the Hemlock Removal Experiment (1-8) plot of the Hemlock Removal Experiment (1-8) genus genus of tree genus of tree species species of tree species of tree code four-letter abbreviation (genus + species) four-letter abbreviation (genus + species) tree.num unique tree identification number (3-769) unique tree identification number (3-769) year growth year (1862-2004) YYYY mmperyear growth increment of tree in millimeters per year (0-15.155) millimeter 0.001 real NA missing value 17339 hf086-02-Rhodora_R_and_csv.zip R code and csv file to accompany Ellison et al. 2014 paper hf086-02-Rhodora_R_and_csv.zip 203496 d4c0987efa9a7827b02de8ade8a957a1 zip R Markdown, csv https://harvardforest.fas.harvard.edu/data/p08/hf086/hf086-02-Rhodora_R_and_csv.zip script, document plot short-term measurement https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf108 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf054 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf107 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf106