气候变化领域集成服务门户(CCPortal): Differential effects of redox conditions on the decomposition of litter and soil organic matter

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DOI	10.1007/s10533-021-00790-y
	Differential effects of redox conditions on the decomposition of litter and soil organic matter
	Lin Y.; Campbell A.N.; Bhattacharyya A.; DiDonato N.; Thompson A.M.; Tfaily M.M.; Nico P.S.; Silver W.L.; Pett-Ridge J.
发表日期	2021
ISSN	1682563
卷号	154 期号:1
英文摘要	Soil redox conditions exert substantial influence on biogeochemical processes in terrestrial ecosystems. Humid tropical forest soils are often characterized by fluctuating redox, yet how these dynamics affect patterns of organic matter decomposition and associated CO2 fluxes remains poorly understood. We used a 13C-label incubation experiment in a humid tropical forest soil to follow the decomposition of plant litter and soil organic matter (SOM) in response to four redox regimes—static oxic or anoxic, and two oscillating treatments. We used high-resolution mass spectrometry to characterize the relative composition of organic compound classes in the water extractable OM. CO2 production from litter and SOM showed different responses to redox treatments. While cumulative production of SOM-derived CO2 was positively correlated with the length of oxic exposure (r = 0.89, n = 20), cumulative 13C-litter-derived CO2 production was not linked to oxygen availability. Litter-derived CO2 production was highest under static anoxic conditions in the first half of the experiment, and later dropped to the lowest rate amongst the treatments. In anoxic soils, we observed depletion of more oxidized water-extractable OM (especially amino sugar-, carbohydrate-, and protein-like compounds) over the second half of the experiment, which likely served as substrates for anaerobic CO2 production. Results from two-pool kinetic modeling showed that more frequent anoxic exposure limited decomposition of a slow-cycling C pool, but not a fast-cycling pool. These results suggest that aerobic and anaerobic heterotrophs were equally effective at degrading labile substrates released from fresh plant litter in this humid tropical forest soil, while aerobic decomposers were more effective in breaking down the potentially refractory compounds found in SOM. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
英文关键词	13C isotope tracing; Decomposition; FTICR-MS; Luquillo Experimental Forest; Puerto Rico; Redox oscillation; Soil organic matter; Soil respiration
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184603
作者单位	Department of Soil and Water Sciences, University of Florida, Gainesville, FL 32611, United States; Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720, United States; Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, United States; Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, United States; Department of Environmental Science, University of Arizona, Tucson, AZ 85719, United States
推荐引用方式 GB/T 7714	Lin Y.,Campbell A.N.,Bhattacharyya A.,et al. Differential effects of redox conditions on the decomposition of litter and soil organic matter[J],2021,154(1).
APA	Lin Y..,Campbell A.N..,Bhattacharyya A..,DiDonato N..,Thompson A.M..,...&Pett-Ridge J..(2021).Differential effects of redox conditions on the decomposition of litter and soil organic matter.Biogeochemistry,154(1).
MLA	Lin Y.,et al."Differential effects of redox conditions on the decomposition of litter and soil organic matter".Biogeochemistry 154.1(2021).