期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-018-05667-7
关键词
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资金
- US Department of Energy (DOE), Office of Biological and Environmental Research
- Terrestrial Ecosystem Sciences grant [DE SC00114085]
- Biological Systems Research on the Role of Microbial Communities in Carbon Cycling Program grants [DE-SC0004601, DE-SC0010715]
- Terrestrial Ecosystem Science Scientific Focus Area (TES-SFA) at Oak Ridge National Laboratory (ORNL)
- US National Science Foundation (NSF) [EF 1137293, OIA-1301789]
- US DOE [DE-AC05-00OR22725]
- Division Of Environmental Biology [1807529] Funding Source: National Science Foundation
Increases in carbon (C) inputs to soil can replenish soil organic C (SOC) through various mechanisms. However, recent studies have suggested that the increased C input can also stimulate the decomposition of old SOC via priming. Whether the loss of old SOC by priming can override C replenishment has not been rigorously examined. Here we show, through data-model synthesis, that the magnitude of replenishment is greater than that of priming, resulting in a net increase in SOC by a mean of 32% of the added new C. The magnitude of the net increase in SOC is positively correlated with the nitrogen-to-C ratio of the added substrates. Additionally, model evaluation indicates that a two-pool interactive model is a parsimonious model to represent the SOC decomposition with priming and replenishment. Our findings suggest that increasing C input to soils likely promote SOC accumulation despite the enhanced decomposition of old C via priming.
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