Faster Decomposition Under Increased Atmospheric CO2 Limits Soil Carbon Storage
Faster Decomposition Under Increased Atmospheric CO2 Limits Soil Carbon Storage
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DOI：
10.1126/science.1249534
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发表时间：
2014-05-02
期刊：
影响因子：
56.9
通讯作者：
Hungate, Bruce A.
中科院分区：
文献类型：
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作者：
van Groenigen, Kees Jan;Qi, Xuan;Hungate, Bruce A.
土壤中含有最大的陆地有机碳（C）库，是大气二氧化碳（CO2）的主要来源。因此，它们可能在调节气候变化方面发挥关键作用。大气中CO2的增加预计将刺激植物生长和土壤碳输入，但也可能改变微生物的分解。这些反应对长期C储存的综合影响尚不清楚。结合元分析与数据同化，我们表明，大气CO2浓度增加刺激输入（+19.8%）和土壤中的碳周转（+16.5%）。随着CO2浓度的升高，土壤碳周转率的增加导致土壤碳平衡储量低于仅从土壤碳输入量的增加所预期的水平，表明这是限制土壤碳积累的一般机制。
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.