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Title: Rapid Accumulation and Turnover of Soil Carbon in a Re-Establishing Forest

Author: Richter, Daniel D.; Markewitz, Daniel; Trumbore, Susan E.; Wells, Carol G.;

Date: 1999

Source: Nature Vol. 400, July 1999

Publication Series: Miscellaneous Publication

Description: Present understanding of the global carbon cycle is limited by uncertainty over soil-carbon dynamics. The clearing of the world's forests, mainly for agricultural uses, releases large amounts of carbon to the atmosphere (up to 2 X 1015yr-1), much of which arises firon the cultivation driving an accelerated decomposition of soil organic matter? Although the effects of cultivation on soil carbon are well studied, studies of soil-carbon recovery after cultivation are limited. Here we present a four decade-long field study of carbon accumulation by pine ecosystems established on previously cultivated soils in South Carolina, USA. Newly accumlated carbon is tracked by its distinctive "C signature, acquired around the onset of forest growth from thermonuclear bomb testing that nearly doubled atmospheric CO2 in the 1960s. Field data combined with model simulations indicate that the young aggrading forest rapidly incorporated bomb radiocarbon into the forest floor and the upper 60cm of underlying mineral soil. By the 1990's, however, carbon accumulated only in forest biomass, forest floor, and the upper 7.5 cm of the mineral soil Although the forest was a strong carbon sink, trees accounted for about 80%, the forest floor 20% and mineral soil

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Richter, Daniel D.; Markewitz, Daniel; Trumbore, Susan E.; Wells, Carol G. 1999. Rapid Accumulation and Turnover of Soil Carbon in a Re-Establishing Forest. Nature Vol. 400, July 1999

 


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