uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/a7fa44640930ba2aa99c9b8244e8ce9a Richard Bowden Serita Frey https://orcid.org/0000-0002-9221-5919 Knute Nadelhoffer https://orcid.org/0000-0001-9775-894X Researcher 2023 English

Climate change will alter forest ecosystem productivity, changing the quantity and quality of detrital inputs to soil and altering rates of soil organic matter (SOM) accumulation and stabilization. To examine changes in forest soil SOM pools, we have used the Detritus Input and Removal Treatments (DIRT) Project to alter organic matter input rates and sources (roots, leaves) to soils, allowing us to measure contributions of organic matter sources to long-term SOM storage at five temperate forests (Harvard Forest, HJ Andrews, Bousson (PA) Experimental Forest (BEF), U. Michigan Biological Station (UMBS), Síkfokut ILTER, Hungary). Organic matter inputs are altered by excluding or adding leaf inputs, or by excluding roots from forested plots. Soil respiration partitioning at HF, BEF, and UMBS shows that soil fertility controls the allocation of C to above- and belowground tissue. At UMBS, glacial outwash sandy soils are extremely low in N, and C released from root respiration plus root litter decomposition is 87% of total soil respiration. Conversely, at the N-rich BEF site, total belowground sources of CO2 are only 61% of soil respiration, with 47% attributed to root litter. These data suggest that at BEF, leaf litter, comprising only 39% of soil respiration, would be a more important source of long-term SOM than root litter. However, soil chemistry and radiocarbon data have shown us that long-term soil C storage is complex. The year 2010 represents the 20-year anniversary of the initiation of DIRT treatments at the Harvard Forest (2010), and we are therefore planning to conduct systematic sampling campaigns for a comprehensive study of changes in SOM quality after long-term manipulation of inputs. One objective is to quantify how 20 years of litter input alterations have affected SOM quantity and quality at the surface (0-20 cm) and deeper in the soil profile (20-100 cm). To uderstand these changes, we need to quantify the quantity and quality of aboveground litter inputs. Total aboveground litter inputs were 300.4 + 8.9 (SE, n=21) g m-2. In congruence with the data for aboveground biomass, black oak contributed the dominant mass (73.9%) of litter inputs; red maple and paper birch together contributed 23.26% of the total. Six other tree species collectively constituted the balance of litter inputs.

detritus litterfall organic matter LTER controlled vocabulary organic matter 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=hf167 Tom Swamp Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.1944 -72.1944 +42.4932 +42.4932 342 342 meter 2008 2008 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

In 2008, we collected leaf litter in twenty-one collection locations at the HF DIRT site, using 0.22 m2 litter collection baskets. Collectors were deployed during early autumn (September) and emptied approximately every two weeks during autumn senescence. After collection, leaves at each collector were composited, returned to the laboratory, and separated by species to estimate the contribution of each species to soil organic matter inputs. After separation, leaves were dried at 105 deg C for 48 hours to constant weight.

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. hf167-01-litter-inputs.csv litter inputs hf167-01-litter-inputs.csv 3484 ebbb217dc1614ece069e94557ada971b 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p16/hf167/hf167-01-litter-inputs.csv plot DIRT plot (1-21) DIRT plot (1-21) species common tree species name common tree species name litter mass of litterfall collected during autumn, 2008 gram 0.01 real NA missing value 189 plot soil short-term measurement https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf007