首页|High nitrogen enrichment increases the allocation of new organic carbon to deep soil layers
High nitrogen enrichment increases the allocation of new organic carbon to deep soil layers
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NSTL
Elsevier
The response of soil organic carbon (SOC) dynamics to nitrogen enrichment in the scale of whole-soil profiles, especially in deeper soil layers containing approximately half of SOC, remains unclear. Here, the incorporation of new vegetation-derived carbon into whole-soil profiles is estimated by combining natural stable isotopes (C-13 and N-15) with radiocarbon analyses under elevated nitrogen inputs with field experiments. The new mechanism responsible for nitrogen-induced carbon sinking in soils is the increased allocation of new carbon to deep soil layers at high nitrogen enrichment resulting from enhanced vertical transport of SOC. Our work provides an unprecedented representation of deep carbon dynamics under elevated nitrogen input and thus supports the development of policies on soil carbon management.
Deep soil layersHigh nitrogen additionVertical transport of soil organic carbonBelowground carbon allocationC-13 natural abundanceRadiocarbon
Yu, Hanxia、Wei, Xiaoshu、Tan, Wenbing
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Fujian Normal Univ, Sch Geog Sci, Fuzhou 350007, Peoples R China
Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China
NSTL
Elsevier
