uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/3b5717fff1d5cf6f8d97cf960cd46f08 Jim Tang https://orcid.org/0000-0003-2498-9012 Kathleen Savage https://orcid.org/0000-0002-1649-5314 Eric Davidson https://orcid.org/0000-0002-8525-8697 2023 English

Total soil respiration (Rt) is a combination of autotrophic (Ra) and heterotrophic respiration (Rh). Several methods have been developed to tease out the components of Rt, such as isotopic analyses, and removing Ra input through tree girdling and root exclusion experiments. Trenching involves severing the rooting system surrounding a plot to remove the Ra component within the plot. This method has some potential limitations. Reduced water uptake in trenched plots could change soil water content, which is one of the environmental controllers of Rt in many ecosystems. Eliminating root inputs could reduce heterotrophic decomposition of SOM via lack of priming. On the other hand, the severed dead roots may temporarily increase available carbon substrate for Rh. We utilized the trenching method to partition the autotrophic and heterotrophic components of soil respiration in an oak dominated forest with the footprint of the LPH tower.

carbon cycling roots soil moisture soil respiration soil temperature LTER controlled vocabulary inorganic nutrients 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=hf243 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.185 -72.180 +42.542 +42.539 355 380 meter 2009 2010 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

Within the footprint of the LPH eddy covariance tower, automated respiration chambers were utilized in conjunction with the trenching method to partition Rt into its components, Rh and Ra. In the late fall of 2008, a trench was dug (to 1m depth) around a 5x5m area, severing all roots leading into the treatment plot. Plastic tarp was placed along the walls of the trench and then backfilled. Three automated chambers were placed in each of the trenched and un-trenched plot. Fluxes, along with soil temperature and moisture, were measured at hourly rates from early spring through late fall of 2009 and 2010. Measurements from the non-trenched plot represent the combined Rh and Ra components, Rt. Fluxes from the trenched plot represent, Rh and the difference (Rt-Rh) represents Ra.

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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. hf243-01-soil-respiration.csv soil respiration hf243-01-soil-respiration.csv 5097002 1c45bedebf1413458f7f11221f77451f 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p24/hf243/hf243-01-soil-respiration.csv datetime date and time YYYY-MM-DDThh:mm 1 minute NA missing value year year YYYY 1 year NA missing value doy day of year nominalDay 1 natural NA missing value time time hh:mm 1 minute NA missing value doy.time day of year, time nominalDay 0.0000001 real NA missing value carbon.flux carbon flux milligramPerMeterSquaredPerHour 0.01 real NA missing value treatment treatment T trenched C control NA missing value soil.temp.10 soil temperature at 10 cm celsius 0.1 real NA missing value soil.mois.2.8 percent soil moisture at 2-8 cm dimensionless 0.1 real NA missing value soil.mois.8.16 percent soil moisture at 8-16 cm dimensionless 0.1 real NA missing value airt.temp air temperature celsius 0.01 real NA missing value 72000 atmosphere short-term measurement https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf194 milligramPerMeterSquaredPerHour