DOI: 10.1111/gcb.12957
论文题名: Carbon storage capacity of semi-arid grassland soils and sequestration potentials in northern China
作者: Wiesmeier M. ; Munro S. ; Barthold F. ; Steffens M. ; Schad P. ; Kögel-Knabner I.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 10 起始页码: 3836
结束页码: 3845
语种: 英语
英文关键词: Climate change
; Fine fraction
; Soil organic carbon
; Soil texture
; Steppe soils
Scopus关键词: carbon sequestration
; climate change
; grassland soil
; organic carbon
; semiarid region
; soil carbon
; soil organic matter
; soil texture
; steppe
; China
; soil
; agriculture
; animal husbandry
; carbon sequestration
; chemistry
; China
; grassland
; soil
; Agriculture
; Animal Husbandry
; Carbon Sequestration
; China
; Grassland
; Soil
英文摘要: Organic carbon (OC) sequestration in degraded semi-arid environments by improved soil management is assumed to contribute substantially to climate change mitigation. However, information about the soil organic carbon (SOC) sequestration potential in steppe soils and their current saturation status remains unknown. In this study, we estimated the OC storage capacity of semi-arid grassland soils on the basis of remote, natural steppe fragments in northern China. Based on the maximum OC saturation of silt and clay particles <20 μm, OC sequestration potentials of degraded steppe soils (grazing land, arable land, eroded areas) were estimated. The analysis of natural grassland soils revealed a strong linear regression between the proportion of the fine fraction and its OC content, confirming the importance of silt and clay particles for OC stabilization in steppe soils. This relationship was similar to derived regressions in temperate and tropical soils but on a lower level, probably due to a lower C input and different clay mineralogy. In relation to the estimated OC storage capacity, degraded steppe soils showed a high OC saturation of 78-85% despite massive SOC losses due to unsustainable land use. As a result, the potential of degraded grassland soils to sequester additional OC was generally low. This can be related to a relatively high contribution of labile SOC, which is preferentially lost in the course of soil degradation. Moreover, wind erosion leads to substantial loss of silt and clay particles and consequently results in a direct loss of the ability to stabilize additional OC. Our findings indicate that the SOC loss in semi-arid environments induced by intensive land use is largely irreversible. Observed SOC increases after improved land management mainly result in an accumulation of labile SOC prone to land use/climate changes and therefore cannot be regarded as contribution to long-term OC sequestration. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61761
Appears in Collections: 影响、适应和脆弱性
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作者单位: Lehrstuhl für Bodenkunde, Department für Ökologie und Ökosystemmanagement, Wissenschaftszentrum Weihenstephan für Ernährung, Landnutzung und Umwelt, Technische Universität München, Freising-Weihenstephan, Germany; Institute of Earth and Environmental Sciences, University of Potsdam, Karl-Liebknecht-Str. 24-25, Golm, Germany; Institute for Advanced Study, Technische Universität München, Lichtenbergstr. 2a, Garching, Germany
Recommended Citation:
Wiesmeier M.,Munro S.,Barthold F.,et al. Carbon storage capacity of semi-arid grassland soils and sequestration potentials in northern China[J]. Global Change Biology,2015-01-01,21(10)