气候变化领域集成服务门户(CCPortal): A unified theory for organic matter accumulation

CCPortal

DOI	10.1073/pnas.2016896118
	A unified theory for organic matter accumulation
	Zakem E.J.; Cael B.B.; Levine N.M.
发表日期	2021
ISSN	00278424
卷号	118 期号:6
英文摘要	Organic matter constitutes a key reservoir in global elemental cycles. However, our understanding of the dynamics of organic matter and its accumulation remains incomplete. Seemingly disparate hypotheses have been proposed to explain organic matter accumulation: the slow degradation of intrinsically recalcitrant substrates, the depletion to concentrations that inhibit microbial consumption, and a dependency on the consumption capabilities of nearby microbial populations. Here, using a mechanistic model, we develop a theoretical framework that explains how organic matter predictably accumulates in natural environments due to biochemical, ecological, and environmental factors. Our framework subsumes the previous hypotheses. Changes in the microbial community or the environment can move a class of organic matter from a state of functional recalcitrance to a state of depletion by microbial consumers. The model explains the vertical profile of dissolved organic carbon in the ocean and connects microbial activity at subannual timescales to organic matter turnover at millennial timescales. The threshold behavior of the model implies that organic matter accumulation may respond nonlinearly to changes in temperature and other factors, providing hypotheses for the observed correlations between organic carbon reservoirs and temperature in past earth climates. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Carbon cycling; Microbial ecology; Organic matter
语种	英语
scopus关键词	dissolved organic carbon; organic carbon; organic matter; unclassified drug; Article; bioaccumulation; biochemical analysis; biomass; carbon cycling; concentration (parameter); conceptual framework; controlled study; correlational study; depletion; ecology; environmental factor; environmental temperature; microbial activity; microbial community; microbial interaction; microbial metabolism; microbial population dynamics; mortality rate; nonhuman; priority journal; qualitative analysis; quantitative analysis; simulation; steady state; stochastic model; turnover rate
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180687
作者单位	Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, United States; Ocean Biogeochemistry and Ecosystems, National Oceanography Centre, Southampton, SO14 3ZH, United Kingdom
推荐引用方式 GB/T 7714	Zakem E.J.,Cael B.B.,Levine N.M.. A unified theory for organic matter accumulation[J],2021,118(6).
APA	Zakem E.J.,Cael B.B.,&Levine N.M..(2021).A unified theory for organic matter accumulation.Proceedings of the National Academy of Sciences of the United States of America,118(6).
MLA	Zakem E.J.,et al."A unified theory for organic matter accumulation".Proceedings of the National Academy of Sciences of the United States of America 118.6(2021).