【土壤碳库】Kees Jan van Groenigen12* Xuan Qi3 Craig W. Osenberg4 Yiqi Luo35 Bruce A. Hungate16. Faster Decomposition Under Increased Atmospheric CO2 Limits Soil Carbon Storage. Science 2 May 2014: Vol. 344 no. 6183 pp. 508-509
Abstract
Soils contain the largest pool of terrestrial organic carbon (C) and are a major source of atmospheric carbon dioxide (CO2). Thus they may play a key role in modulating climate change. Rising atmospheric CO2 is expected to stimulate plant growth and soil C input but may also alter microbial decomposition. The combined effect of these responses on long-term C storage is unclear. Combining meta-analysis with data assimilation we show that atmospheric CO2 enrichment stimulates both the input (+19.8%) and the turnover of C in soil (+16.5%). The increase in soil C turnover with rising CO2 leads to lower equilibrium soil C stocks than expected from the rise in soil C input alone indicating that it is a general mechanism limiting C accumulation in soil.
