section1=Terrestrial section2=Highlights Annual national soil carbon map for US agricultural lands coming soon Tristram O. West and Craig C. Brandt. 2006.
Changes in land management occur annually on agricultural lands. These changes impact soil carbon stocks and net carbon flux from soils. To account for changes in local land management and soil carbon at regional and national scales, we developed a method that integrates field data, inventory data, and remote sensing images to estimate changes in soil carbon stocks at a 900m2 resolution. County level data for harvested crops and tillage intensity are integrated into one data product. Remote sensing data, soil boundaries and attributes, and county boundaries are queried for unique combinations of soils and land use at a sub-county resolution. Annual changes in soil carbon are estimated from changes in land management and from empirical estimates of soil change derived from field measurements. These changes are distributed to the sub-county level using Landsat-based remote sensing products. We have recently applied this integration method to an area in the mid-western US consisting of 679 counties approximately centered around Iowa (see Figure). We anticipate the completion of annual soil carbon flux maps for the entire US and availability from CDIAC in the coming months.
Two new data sets have been posted to the Terrestrial Carbon Sequestration Data Sets web page. One focuses on soil C loss following cultivation and the other with soil C accumulation following the establishment of forest or grassland on previously cultivated land.
section1=Terrestrial section2=Events 36th Biological Systems Simulation Conference 2006 http://ars.usda.gov/bssg/ The Editor. 2006.
The Biological Systems Simulation Group (BSSG) held its 36th annual meeting in Fort Collins, Colorado, U.S.A. from 11-13 April 2006. Hosted by the U.S. Water Conservation Laboratory (USWCL), the BSSG conference provides a forum for researchers from a broad range of disciplines to interchange ideas and experiences with the ultimate goal of improving the efficiency and productivity of agricultural production, while conserving or even enhancing soil and water resources.
CDIAC serves as the permanent data archive and focal point for the dissemination of long-term CO2, radiation, and water vapor flux measurements made at sites comprising the AmeriFlux network. AmeriFlux objectives include: 1) establish an infrastructure for guiding, collecting, synthesizing, and disseminating long-term measurements of CO2, water, and energy exchange from a variety of ecosystems; 2) collect critical new information to help define the current global CO2 budget; 3) enable improved predictions of future concentrations of atmospheric CO2; and 4) enhance understanding of carbon fluxes, Net Ecosystem Production (NEP), and carbon sequestration in the terrestrial biosphere. The AmeriFlux data collection now contains over 5 million data records for 60 measurement parameters from ~80 AmeriFlux sites. Data span the period 1991-2006.
A combined meeting of the third biennial global vegetation workshop and the Committee on Earth Observing Satellites Working Group on Calibration and Validation will be held August 8-10, 2006 at the University of Montana in Missoula, Montana, USA. The primary objective of this workshop is to establish a framework to understand the inter-relationship between multiple, global vegetation products so to identify opportunities for increasing knowledge through combined products, realizing efficiency by avoiding redundancy, and developing near- and long-term plans to avoid gaps in our understanding of critical global vegetation information.