DOI: 10.1038/ngeo2520
论文题名: Formation of soil organic matter via biochemical and physical pathways of litter mass loss
作者: Cotrufo M.F. ; Soong J.L. ; Horton A.J. ; Campbell E.E. ; Haddix M.L. ; Wall D.H. ; Parton W.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 10 起始页码: 776
结束页码: 779
语种: 英语
Scopus关键词: biochemistry
; biomass
; decomposition
; grassland
; litter
; microbial activity
; mineralization
; numerical model
; soil organic matter
; Kansas
; United States
英文摘要: Soil organic matter is the largest terrestrial carbon pool. The pool size depends on the balance between formation of soil organic matter from decomposition of plant litter and its mineralization to inorganic carbon. Knowledge of soil organic matter formation remains limited and current C numerical models assume that stable soil organic matter is formed primarily from recalcitrant plant litter. However, labile components of plant litter could also form mineral-stabilized soil organic matter. Here we followed the decomposition of isotopically labelled above-ground litter and its incorporation into soil organic matter over three years in a grassland in Kansas, USA, and used laboratory incubations to determine the decay rates and pool structure of litter-derived organic matter. Early in decomposition, soil organic matter formed when non-structural compounds were lost from litter. Soil organic matter also formed at the end of decomposition, when both non-structural and structural compounds were lost at similar rates. We conclude that two pathways yield soil organic matter efficiently. A dissolved organic matter-microbial path occurs early in decomposition when litter loses mostly non-structural compounds, which are incorporated into microbial biomass at high rates, resulting in efficient soil organic matter formation. An equally efficient physical-transfer path occurs when litter fragments move into soil. © 2015 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106163
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Natural Resources Ecology Laboratory, Colorado State University, Fort Collins, CO, United States; Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO, United States; Department of Biology, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Cotrufo M.F.,Soong J.L.,Horton A.J.,et al. Formation of soil organic matter via biochemical and physical pathways of litter mass loss[J]. Nature Geoscience,2015-01-01,8(10)