DOI: 10.1111/gcb.13980
Scopus记录号: 2-s2.0-85036494542
论文题名: Nitrogen limitation of decomposition and decay: How can it occur?
作者: Averill C. ; Waring B.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 4 起始页码: 1417
结束页码: 1427
语种: 英语
英文关键词: carbon storage
; decomposition
; microbial ecology
; nitrogen
; nutrient limitation
; soil
英文摘要: 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. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110452
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: NOAA Climate and Global Change Postdoctoral Fellow, Boston University, Boston, MA, United States; Biology Department and Ecology Center, Utah State University, Logan, UT, United States
Recommended Citation:
Averill C.,Waring B.. Nitrogen limitation of decomposition and decay: How can it occur?[J]. Global Change Biology,2018-01-01,24(4)