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• W2767539056 abstract "The availability of nitrogen (N) is a critical control on the cycling and storage of soil carbon (C). Yet, there are conflicting conceptual models to explain how N availability influences the decomposition of organic matter by soil microbial communities. Several lines of evidence suggest that N availability limits decomposition; the earliest stages of leaf litter decay are associated with a net import of N from the soil environment, and both observations and models show that high N organic matter decomposes more rapidly. In direct contrast to these findings, experimental additions of inorganic N to soils broadly show a suppression of microbial activity, which is inconsistent with N limitation of decomposition. Resolving this apparent contradiction is critical to representing nutrient dynamics in predictive ecosystem models under a multitude of global change factors that alter soil N availability. Here, we propose a new conceptual framework, the Carbon, Acidity, and Mineral Protection hypothesis, to understand the effects of N availability on soil C cycling and storage and explore the predictions of this framework with a mathematical model. Our model simulations demonstrate that N addition can have opposing effects on separate soil C pools (particulate and mineral-protected carbon) because they are differentially affected by microbial biomass growth. Moreover, changes in N availability are frequently linked to shifts in soil pH or osmotic stress, which can independently affect microbial biomass dynamics and mask N stimulation of microbial activity. Thus, the net effect of N addition on soil C is dependent upon interactions among microbial physiology, soil mineralogy, and soil acidity. We believe that our synthesis provides a broadly applicable conceptual framework to understand and predict the effect of changes in soil N availability on ecosystem C cycling under global change." @default.
• W2767539056 created "2017-11-17" @default.
• W2767539056 creator A5010282852 @default.
• W2767539056 creator A5061845409 @default.
• W2767539056 date "2017-12-01" @default.
• W2767539056 modified "2023-10-16" @default.
• W2767539056 title "Nitrogen limitation of decomposition and decay: How can it occur?" @default.
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• W2767539056 doi "https://doi.org/10.1111/gcb.13980" @default.
• W2767539056 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29121419" @default.
• W2767539056 hasPublicationYear "2017" @default.
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