Different effects of plant-derived dissolved organic matter (DOM) and urea on the priming of soil organic carbon

Environmental Science. Processes & Impacts
Qingyan QiuYanyan Xu

Abstract

Soil organic carbon (SOC) mineralization is important for the regulation of the global climate and soil fertility. Decomposition of SOC may be significantly affected by the supply of plant-derived labile carbon (C). To investigate the impact of plant-derived dissolved organic matter (DOM) and urea (N) additions on the decomposition of native SOC as well as to elucidate the underlying mechanisms of priming effects (PEs), a batch of incubation experiments was conducted for 250 days by application of (13)C-labeled plant-derived DOM and urea to soils. The direction of PE induced by the addition of DOM was different from the addition of N, i.e. it switched from negative to positive in DOM-amended soils, whereas in the N-treated soil it switched from positive to negative. Adding DOM alone was favorable for soil C sequestration (59 ± 5 mg C per kg soil), whereas adding N alone or together with DOM accelerated the decomposition of native SOC, causing net C losses (-62 ± 4 and -34 ± 31 mg C per kg soil, respectively). These findings indicate that N addition and its interaction with DOM are not favorable for soil C sequestration. Adding DOM alone increased the level of dissolved organic carbon (DOC), but it did not increase the level of ...Continue Reading

References

Feb 19, 2009·Proceedings of the National Academy of Sciences of the United States of America·Xiao-Tang JuFu-Suo Zhang
Oct 22, 2009·The New Phytologist·Nadine K RuehrRomain L Barnard
Nov 10, 2010·The New Phytologist·Marie-Anne de GraaffChristopher W Schadt
Feb 22, 2013·Nature·Xuejun LiuFusuo Zhang

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