uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/a90bff379ea75ff7dc2fbde24097cdc5 David Foster https://orcid.org/0000-0003-1171-3762 Jason McLachlan Audrey Barker Plotkin https://orcid.org/0000-0002-4473-9785 Researcher 2023 English

Hemlock (Tsuga canadensis) forests in New England are changing rapidly with the invasion of the hemlock woolly adelgid (HWA, Adelges tsugae), a non-native insect pest that kills hemlock trees. The adelgid is just beginning to be observed at Harvard Forest, making this the right moment to begin intensive physiological, ecological and monitoring studies of our hemlock forests. We gathered detailed baseline information for several hemlock stands across Harvard Forest. We surveyed community vegetation structure and composition, and began to monitor soil nitrogen cycling. These measurements will allow us to link the long-term history of these hemlock stands to other current studies of hemlock response to adelgid infestation, and will provide the basis for intensive study of hemlock dynamics with the stands' anticipated decline.

hemlock land use permanent plots tree maps vegetation dynamics LTER controlled vocabulary 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=hf053 Prospect Hill Tract (Harvard Forest), Slab City Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.22 -72.18 +42.55 +42.45 250 350 meter 1995 2022 genus Tsuga species canadensis eastern hemlock 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

Four 30m x 30m plots were established in 1995. Species, crown class, size (diameter at breast height) were determined. Trees were mapped using INTERPT software (HF023). Trees were remeasured in 2002, 2012, 2022. Starting in 2002, hemlock trees were rated for vigor. Starting in 2012, hemlock trees with low branches were inspected for hemlock woolly adelgid presence.

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. hf053-01-trees.csv tree data hf053-01-trees.csv 40151 ba579a585d133605bd8b17f1b34549f1 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p05/hf053/hf053-01-trees.csv plot one of four plots PH2 30m x 30m hemlock history plot located on Prospect Hill, Compartment 2 PH7 30m x 30m hemlock history plot located on Prospect Hill, Compartment 7 SC9 30m x 30m hemlock history plot located on Slab City, Compartment 9 SC10 30m x 30m hemlock history plot located on Slab City, Compartment 10 tree all trees are tagged in the field with their number. Number system not continuous. tree numbers species first two letters of genus and species name of tree ACRU Acer rubrum BEAL Betula alleghaniensis BELE Betula lenta BEPA Betula papyrifera FAGR Fagus grandifolia FRAM Fraxinus Americana FRNI Fraxinus nigra PIST Pinus strobes PRSE Prunus serotina QURU Quercus rubra TSCA Tsuga canadensis UNK Unknown cc95 crown class rating, noted in 1995 D dominant and codominant C intermediate I suppressed S second layer (umbrella shaped hemlocks) NA not applicable (e.g. tree is dead) cond95 condition, noted in 1995 D dead L live miss tree not measured in 1995 and was added in the 2002 census dbh95 diameter at breast height (1.37m) in 1995 centimeter 0.1 real NA missing value dbh02 diameter at breast height (1.37m) in summer 2002 centimeter 0.1 real NA missing value vigor02 vigor class. Non-hemlocks classified as 1(living) or 5 (dead) only. 1 0-25% foliage loss 2 25-50% loss 3 50-75% loss 4 75-99% loss 5 dead dbh12 diameter at breast height (1.37m) in summer 2012 centimeter 0.1 real NA missing value vigor12 vigor class. Non-hemlocks classified as 1(living) or 5 (dead) only. 1 0-25% foliage loss 2 25-50% loss 3 50-75% loss 4 75-99% loss 5 dead NA in a few cases, a tree wasn’t located hwa12 assessed on hemlocks with branches within arm’s reach only. Presence or absence of hemlock woolly adelgid (Adelges tsugae) was based on visual inspection of two branches. 0 no hemlock woolly adelgid observed 1 hemlock woolly adelgid observed NA not assessed (branches too high, dead tree, or non-hemlock individual) x corresponds with the X axis of the plot, which ranges from 0-30 m (meter). Not available for plot SC10. meter 0.01 real NA missing value y corresponds with the Y axis of the plot, which ranges from 0-30 m (meter). ). Not available for plot SC10. meter 0.01 real NA missing value sigeo.num for plot PH2 only. Many of these trees are also tagged and included in the 35-hectare forest dynamics plot (SIGEO, aka ForestGEO, plot). In these cases, the SIGEO plot number is listed. for plot PH2 only. Many of these trees are also tagged and included in the 35-hectare forest dynamics plot (SIGEO plot). In these cases, the SIGEO plot number is listed. dbh22 diameter at breast height (1.37m) in August/September 2022 centimeter 0.1 real NA missing value vigor22 vigor class in 2022. Non-hemlocks classified as 1(living) or 5 (dead) only. 1 0-25% foliage loss 2 25-50% loss 3 50-75% loss 4 75-99% loss 5 dead NA in a few cases, a tree wasn’t located hwa22 assessed on hemlocks with branches within arm’s reach only. Presence or absence of hemlock woolly adelgid (Adelges tsugae) in 2022 was based on visual inspection of two branches. 0 no hemlock woolly adelgid observed 1 hemlock woolly adelgid observed NA not assessed (branches too high, dead tree, or non-hemlock individual) notes notes about whether a tree is dead, fallen, or unusual notes about whether a tree is dead, fallen, or unusual 531 invasive plot long-term measurement https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf023 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf036 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf048