气候变化领域集成服务门户(CCPortal): Variability of ecosystem carbon source from microbial respiration is controlled by rainfall dynamics

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DOI	10.1073/pnas.2115283118
	Variability of ecosystem carbon source from microbial respiration is controlled by rainfall dynamics
	Huang H.; Calabrese S.; Rodriguez-Iturbe I.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:52
英文摘要	Soil heterotrophic respiration (Rh) represents an important component of the terrestrial carbon cycle that affects whether ecosystems function as carbon sources or sinks. Due to the complex interactions between biological and physical factors controlling microbial growth, Rhis uncertain and difficult to predict, limiting our ability to anticipate future climate trajectories. Here we analyze the global FLUXNET 2015 database aided by a probabilistic model of microbial growth to examine the ecosystem-scale dynamics of Rhand identify primary predictors of its variability. We find that the temporal variability in Rhis consistently distributed according to a Gamma distribution, with shape and scale parameters controlled only by rainfall characteristics and vegetation productivity. This distribution originates from the propagation of fast hydrologic fluctuations on the slower biological dynamics of microbial growth and is independent of biome, soil type, and microbial physiology. This finding allows us to readily provide accurate estimates of the mean Rhand its variance, as confirmed by a comparison with an independent global dataset. Our results suggest that future changes in rainfall regime and net primary productivity will significantly alter the dynamics of Rhand the global carbon budget. In regions that are becoming wetter, Rhmay increase faster than net primary productivity, thereby reducing the carbon storage capacity of terrestrial ecosystems. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Carbon cycle; Heterotrophic respiration; Microbial dynamics; Rainfall; Stochastic behavior
语种	英语
scopus关键词	carbon; rain; biological model; carbon cycle; cell respiration; climate; ecosystem; Markov chain; metabolism; microbiology; physiology; Carbon; Carbon Cycle; Cell Respiration; Climate; Ecosystem; Models, Biological; Rain; Soil Microbiology; Stochastic Processes
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/250903
作者单位	Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, United States; Department of Ocean Engineering, Texas A&M University, College Station, TX 77843, United States; Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX 77843, United States
推荐引用方式 GB/T 7714	Huang H.,Calabrese S.,Rodriguez-Iturbe I.. Variability of ecosystem carbon source from microbial respiration is controlled by rainfall dynamics[J],2021,118(52).
APA	Huang H.,Calabrese S.,&Rodriguez-Iturbe I..(2021).Variability of ecosystem carbon source from microbial respiration is controlled by rainfall dynamics.Proceedings of the National Academy of Sciences of the United States of America,118(52).
MLA	Huang H.,et al."Variability of ecosystem carbon source from microbial respiration is controlled by rainfall dynamics".Proceedings of the National Academy of Sciences of the United States of America 118.52(2021).