气候变化领域集成服务门户(CCPortal): Impacts of litter decay on organic leachate composition and reactivity

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DOI	10.1007/s10533-021-00799-3
	Impacts of litter decay on organic leachate composition and reactivity
	Hensgens G.; Lechtenfeld O.J.; Guillemette F.; Laudon H.; Berggren M.
发表日期	2021
ISSN	1682563
起始页码	99
结束页码	117
卷号	154 期号:1
英文摘要	Litter decomposition produces labile and recalcitrant forms of dissolved organic matter (DOM) that significantly affect soil carbon (C) sequestration. Chemical analysis of this DOM can provide important knowledge for understanding soil DOM dynamics, but detailed molecular analyses on litter derived DOM are scarce. Here we use ultrahigh resolution mass spectrometry (FT-ICR MS) to characterize the molecular composition of DOM from fresh and progressively decomposed litter samples. We compared high reactive (HR) and low reactive (LR) litter sources with regard to changes in the chemistry and bioavailability of leachates throughout the early phase of litter decay. We show that litter reactivity is a driver of chemical changes in the leached DOM of litter species. Birch, alder and Vaccinium (i.e. HR) litter initially produced more DOM with a higher lability than that of spruce, pine and wood (i.e. LR) litter. Labile oxidized phenolic compounds were abundant in leachates produced during the initial HR litter decay stages, indicating litter lignin degradation. However, the similarity in chemistry between HR and LR leachates increased during the litter decay process as highly leachable structures in HR litter were depleted. In contrast, chemistry of leachates from LR litter changed little during the litter decay process. The oxygenated phenolic compounds from HR litter were driving the lability of HR leachates and the changes in relative abundance of molecules during DOM incubation. This appeared to result in the creation of stable aliphatic secondary microbial compounds. In LR leachates, lability was driven by labile aliphatic compounds, while more resistant phenolic compounds were associated with recalcitrance. These results show how DOM dynamics follow different paths depending on litter reactivity, which has important implications for soil biogeochemistry and C sequestration. © 2021, The Author(s).
英文关键词	Boreal; Decomposition; Dissolved organic matter; DOC; DOM; FT-ICR MS; Litter leaching; Reactivity
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/184600
作者单位	Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; Department of Analytical Chemistry, Research Group BioGeoOmics, Helmholtz Centre for Environmental Research—UFZ, Permoserstr. 15, Leipzig, 04318, Germany; Centre for Research on Watershed – Aquatic Ecosystem Interactions, University of Quebec at Trois-Rivieres, Trois-Rivieres, QC, Canada; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
推荐引用方式 GB/T 7714	Hensgens G.,Lechtenfeld O.J.,Guillemette F.,et al. Impacts of litter decay on organic leachate composition and reactivity[J],2021,154(1).
APA	Hensgens G.,Lechtenfeld O.J.,Guillemette F.,Laudon H.,&Berggren M..(2021).Impacts of litter decay on organic leachate composition and reactivity.Biogeochemistry,154(1).
MLA	Hensgens G.,et al."Impacts of litter decay on organic leachate composition and reactivity".Biogeochemistry 154.1(2021).