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BOREAS TGB-12 Soil Carbon Site Information
During 1993 and 1994, the BOReal Ecosystem-Atmosphere Study (BOREAS) Trace Gas and Biogeochemistry team #12 (TGB-12) collected several data sets to support their analysis of soil carbon content in the Northern Study Area (NSA). The primary data set (BOREAS TGB-12 Soil Carbon Data over the NSA) is described in some detail. Other ancillary information was stored and provided in two sets of soil pit description and surface vegetation transect files. In addition, a site description file provides more information on the positioning of the sampling sites. These files contain additional information that complements the data contained in the primary data set.
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BOREAS TGB-12 Radon-222 Flux Data: NSA
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The BOREAS TGB-12 team made measurements of soil carbon inventories, carbon concentration in soil gases, and rates of soil respiration at several sites to estimate the rates of carbon accumulation and turnover in each of the major vegetation types. Sampling strategies for soils were designed to take advantage of local fire chronosequences, so that the accumulation of carbon in new moss growth could be determined. All the data are used to 1) calculate the inventory of carbon and nitrogen in moss and mineral soil layers at NSA sites, 2) determine the rates of input and turnover (using both accumulation since the last stand-killing fire and radiocarbon data), and 3) link changes in soil respiration rate to shifts in the 14C content of soil CO2 to determine the average 'age' respired CO2. These 222Rn flux data were collected from 15-NOV-1993 to 16-AUG-1994 over the NSA sites.
BOREAS TE-05 Leaf Carbon Isotope Data
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The BOREAS group TE-05 collected measurements in the NSA and SSA on gas exchange, gas composition and tree growth. This documentation describes leaf carbon isotope data that were collected in 1993 and 1994 at the NSA and SSA OJP, OBS and NSA UBS sites. In addition, leaf carbon isotope data were collected in 1994 only at the NSA and SSA OA sites. These data were collected to provide seasonal integrated physiological information for 10 to 15 common species at these 6 BOREAS sites.
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