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Liang, Junyi; Zhou, Zhenghu; Huo, Changfu; Shi, Zheng; Cole, James R; Huang, Lei; Konstantinidis, Konstantinos T; Li, Xiaoming; Liu, Bo; Luo, Zhongkui; Penton, C Ryan; Schuur, Edward A G; Tiedje, James M; Wang, Ying-Ping; Wu, Liyou; Xia, Jianyang; Zhou, Jizhong; Luo, Yiqi
Nature communications, 08/2018, Letnik: 9, Številka: 1Journal Article
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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