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4	US Land Cover Change There is no consistent database available that characterizes the contemporary US land cover change, because Land cover change mapping over large areas is a major effort Labor intensive Money (funding sources)
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22	Summary Land cover change was very dynamic. Major changes include urban expansion, reduction in cropland area, and extensification of clearcutting activities. Large spatial and inter-annual variability in NPP, C sequestration, and total C sink. C change rate in biomass and soils increases with total C stock Soil C sink and total C sink is decoupled. C sequestration is tightly coupled with C sink strength. Harvested wood C increased over time because of extensification of clearcutting. The average C sequestration rate was 96 ± 12 (1s) gC m^-2 y^-1. Soil sequestration accounted for about 35% of the total C sequestration. Soil was a C source when total C sequestration was less than 50 g C m^-2 y^-1
23	Poster 312 Soil Organic Carbon Budget as Related to Land Use History in the Northwestern Great Plains