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	Stoichiometrical regulation of soil organic matter decomposition and its temperature sensitivity
	He N. P.; Yu, G. R.
	2016
关键词	C:N ratio heterotrophic respiration kinetic models mineralization Q (10) substrate quality warming microbial response northern china leaf-litter nitrogen carbon plant respiration forest model dependence
英文摘要	The decomposition of soil organic matter (SOM) can be described by a set of kinetic principles, environmental constraints, and substrate supply. Here, we hypothesized that SOM decomposition rates (R) and its temperature sensitivity (Q(10)) would increase steadily with the N:C ratios of added substrates by alleviating N limitation on microbial growth. We tested this hypothesis by investigating SOM decomposition in both grassland and forest soils after addition of substrates with a range of N:C ratios. The results showed that Michaelis-Menten equations well fit the response of R to the N:C ratio variations of added substrates, and their coefficients of determination (R-2) ranged from 0.65 to 0.89 (P<0.01). Moreover, the maximal R, Q(10), and cumulative C emission of SOM decomposition increased exponentially with the N:C ratios of added substrates, and were controlled interactively by incubation temperature and the N:C ratios of the added substrates. We demonstrated that SOM decomposition rate and temperature sensitivity were exponentially correlated to substrate stoichiometry (N:C ratio) in both grassland and forest soils. Therefore, these correlations should be incorporated into the models for the prediction of SOM decomposition rate under warmer climatic scenarios.
出处	Ecology and Evolution
卷	6
期	2
页	620-627
语种	英语
ISSN号	2045-7758
DOI标识	10.1002/ece3.1927
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/42976]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	He N. P.,Yu, G. R.. Stoichiometrical regulation of soil organic matter decomposition and its temperature sensitivity. 2016.

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