DOI: 10.1111/gcb.13237
论文题名: Dual, differential isotope labeling shows the preferential movement of labile plant constituents into mineral-bonded soil organic matter
作者: Haddix M.L. ; Paul E.A. ; Cotrufo M.F.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 6 起始页码: 2301
结束页码: 2312
语种: 英语
英文关键词: Andropogon gerardii
; Differential isotopic labeling
; Litter decomposition
; Microbial efficiency-matrix stabilization
; Q 10-q
; Soil organic matter stabilization
; Stabilization efficiency
; Temperature sensitivity
Scopus关键词: decomposition
; grass
; litter
; soil organic matter
; stabilization
; temperature effect
; Andropogon gerardii
; carbon
; carbon dioxide
; fertilizer
; humic substance
; mineral
; nitrogen
; soil
; Andropogon
; chemistry
; humic substance
; isotope labeling
; soil
; Andropogon
; Carbon Dioxide
; Carbon Isotopes
; Fertilizers
; Humic Substances
; Isotope Labeling
; Minerals
; Nitrogen Isotopes
; Soil
英文摘要: The formation and stabilization of soil organic matter (SOM) are major concerns in the context of global change for carbon sequestration and soil health. It is presently believed that lignin is not selectively preserved in soil and that chemically labile compounds bonding to minerals comprise a large fraction of the SOM. Labile plant inputs have been suggested to be the main precursor of the mineral-bonded SOM. Litter decomposition and SOM formation are expected to have temperature sensitivity varying with the lability of plant inputs. We tested this framework using dual 13C and 15N differentially labeled plant material to distinguish the metabolic and structural components within a single plant material. Big Bluestem (Andropogon gerardii) seedlings were grown in an enriched 13C and 15N environment and then prior to harvest, removed from the enriched environment and allowed to incorporate natural abundance 13C-CO2 and 15N fertilizer into the metabolic plant components. This enabled us to achieve a greater than one atom % difference in 13C between the metabolic and structural components within the plant litter. This differentially labeled litter was incubated in soil at 15 and 35 °C, for 386 days with CO2 measured throughout the incubation. After 14, 28, 147, and 386 days of incubation, the soil was subsequently fractionated. There was no difference in temperature sensitivity of the metabolic and structural components with regard to how much was respired or in the amount of litter biomass stabilized. Only the metabolic litter component was found in the sand, silt, or clay fraction while the structural component was exclusively found in the light fraction. These results support the stabilization framework that labile plant components are the main precursor of mineral-associated organic matter. © 2016 John Wiley & Sons Ltd. 资助项目: Acknowledgements This work was supported by the National Science Foundation- Division of Environmental Biology grant #0918482, and the Cotrufo-Hoppess fund for soil ecological research. All analyses were performed at the EcoCore Analytical Service Facility (http://ecocore.nrel.colostate.edu/). We would like to thank Claire Freeman, Allison Reser, and Ana Beatriz Coelho Franca for their assistance with the laboratory work and three anonymous reviewers for their valuable comments on this manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61397
Appears in Collections: 影响、适应和脆弱性
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作者单位: Natural Resource Ecology Laboratory, Colorado State University, 200 West Lake Street, Fort Collins, CO, United States; Department of Soil and Crop Sciences, Colorado State University, 200 West Lake Street, Fort Collins, CO, United States
Recommended Citation:
Haddix M.L.,Paul E.A.,Cotrufo M.F.. Dual, differential isotope labeling shows the preferential movement of labile plant constituents into mineral-bonded soil organic matter[J]. Global Change Biology,2016-01-01,22(6)