uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/c07ac14861da83fe22b903cc1a480f04 Ruth Varner https://orcid.org/0000-0002-3571-6629 Patrick Crill Researcher Steven Wofsy https://orcid.org/0000-0002-3133-2089 Researcher 2023 English

Soil respiration is an important component of the terrestrial carbon budget. Spatial variation of organic matter and plant cover induce temperature and moisture gradations that obscure direct response of soil respiration to radiative forcing. Separation of spatial patterns from microclimate and substrate availability is vital to predict the response to global change. We are measuring temporal and spatial patterns of soil CO2 flux across a hydrological gradient from wetland to upland soils. A system of 8 automated opaque chambers were installed in 2003 along a hydrological gradient on the northeast margin of the "Beaver Swamp" north of the EMS tower (+42.537755,-72.171478). Two additional clear chambers were installed in the wetland in 2006. Each automated chamber closes for a measurement every four hours. The resulting semi-continuous data has been providing a high-temporal density characterization of soil flux during the growing season since 2003. Soil temperature and moisture were recorded in the litter, organic, and mineral soils during 2004 at three locations along the slope. These structures will provide a database of soil respiration flux, temperature, and soil moisture with both high spatial and temporal resolution, across multiple cover types and ground water levels. The analysis will seek to determine the appropriate spatial scale of soil respiration measurement in eastern hardwood forests.

air temperature hydrology 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=hf068 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.17 -72.17 +42.54 +42.54 340 340 meter 2003 2006 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

Chambers 1 through 8 consist of aluminum chambers (43.2 x 43.2 x 15.2 cm) that close over metal frames that extend 2 cm into the soil. The chambers are numbered by distance to upland, with 1 being the top of the slope and 8 closest to the wetland. The chambers are not aligned in a linear transect, but are spread throughout the hill slope. Chambers 9 and 10 are clear lexan chambers measuring net ecosystem exchange and are located in the wetland. When a chamber is closed, air from the headspace is pumped to an infrared gas analyzer (LiCor 820) and the air is returned to the chamber to minimize pressure effects. The measurement system is controlled by a datalogger (Campbell Scientific CR10X) that opens and closes the chambers according to the measurement cycle. Linear regression of the change in CO2 mixing ratios (d ppmv/min) was converted to a flux rate (umol m-2 s-1). Soil temperature is measured by thermocouples (Omega Engineering Type-T) and soil water content is recorded using TDR probes (Decagon Devices ECH2O) inserted horizontally at the base of each soil horizon.

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. hf068-01-soil-resp.csv soil respiration hf068-01-soil-resp.csv 2005475 30b71dd4b0f88ea1b7390b2a8ca7cfc4 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p06/hf068/hf068-01-soil-resp.csv datetime date and time YYYY-MM-DDThh:mm year year YYYY doy day of year with fraction of day nominalDay 0.0001 real hour fraction of day nominalHour 0.0001 real chamber chamber number chamber number avg.airt average air temperature celsius 0.01 real NA missing value avg.grndt average ground temperature celsius 0.01 real NA missing value co2flux efflux of CO2 from soil micromolePerMeterSquaredPerSecond 0.01 real NA missing value 38060 hf068-02-wetland-resp.csv wetland respiration hf068-02-wetland-resp.csv 84174 5e7e4a99c6af7fe56d12b85d63d80629 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p06/hf068/hf068-02-wetland-resp.csv datetime date and time YYYY-MM-DDThh:mm year year YYYY doy day of year with fraction of day nominalDay 0.0001 real hour fraction of day nominalHour 0.0001 real chamber chamber number chamber number avg.airt average air temperature celsius 0.01 real NA missing value avg.grndt average ground temperature celsius 0.01 real NA missing value co2flux net exchange of CO2 from wetland micromolePerMeterSquaredPerSecond 0.01 real NA missing value 1570 hf068-03-moisture.csv soil moisture and temperature hf068-03-moisture.csv 881923 80170a821cc2c1cd131a49c5a3a3e881 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p06/hf068/hf068-03-moisture.csv datetime date and time YYYY-MM-DDThh:mm year year YYYY doy day of year with fraction of day nominalDay 0.0001 real tcl.l thermocouple low profile, litter layer at 2.5 cm celsius 0.01 real NA missing value tcl.os thermocouple low profile, shallow organic horizon at 7 cm celsius 0.01 real NA missing value tcl.od thermocouple low profile, deep organic horizon at 18.75 cm celsius 0.01 real NA missing value tcl.m thermocouple low profile, mineral soil at 30 cm celsius 0.01 real NA missing value tcm.l thermocouple middle profile, litter layer at 1 cm celsius 0.01 real NA missing value tcm.o thermocouple middle profile, organic horizon at 5 cm celsius 0.01 real NA missing value tcm.ms thermocouple middle profile, mineral soil at 16.25 cm celsius 0.01 real NA missing value tcm.md thermocouple middle profile, mineral soil at 30 cm celsius 0.01 real NA missing value tch.l thermocouple high profile, litter layer at 1.25 cm celsius 0.01 real NA missing value tch.o thermocouple high profile, organic layer at 5 cm celsius 0.01 real NA missing value tch.ms thermocouple high profile, mineral soil at 15 cm celsius 0.01 real NA missing value tch.md thermocouple high profile, mineral soil at 30 cm celsius 0.01 real NA missing value sml.l soil moisture low profile, litter layer at 2.5 cm volt 0.01 real NA missing value sml.os soil moisture low profile, shallow organic horizon at 7 cm volt 0.01 real NA missing value sml.od soil moisture low profile, deep organic horizon at 18.75 cm volt 0.01 real NA missing value sml.m soil moisture low profile, mineral soil at 30 cm volt 0.01 real NA missing value smm.l soil moisture middle profile, litter layer at 1 cm volt 0.01 real NA missing value smm.o soil moisture middle profile, organic horizon at 5 cm volt 0.01 real NA missing value smm.ms soil moisture middle profile, shallow mineral soil at 16.25 cm volt 0.01 real NA missing value smm.md soil moisture middle profile, deep mineral soil at 30 cm volt 0.01 real NA missing value smh.l soil moisture high profile, litter layer at 1.25 volt 0.01 real NA missing value smh.o soil moisture high profile, organic layer at 5 cm volt 0.01 real NA missing value smh.ms soil moisture high profile, shallow mineral soil at 15 cm volt 0.01 real NA missing value smh.md soil moisture high profile, deep mineral soil at 30 cm volt 0.01 real NA missing value wcl.l water content low profile, litter layer 2.5 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wcl.os water content low profile, shallow organic horizon 7 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wcl.od water content low profile, deep organic horizon 18.75 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wcl.m water content low profile, mineral soil at 30 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wcm.l water content middle profile, litter layer at 1 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wcm.o water content middle profile, organic horizon at 5 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wcm.ms water content middle profile, shallow mineral soil at 16.25 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wcm.md water content middle profile, deep mineral soil at 30 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wch.l water content high profile, litter layer 1.25 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wch.o water content high profile, organic horizon 5 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wch.ms water content high profile, shallow mineral soil 15 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value wch.md water content of high profile, deep mineral soil 30 cm cubicCentimetersPerCubicCentimeters 0.01 real NA missing value 4117 atmosphere short-term measurement https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf004 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf006