IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Cs-137 tracing dynamics of soil erosion, organic carbon and nitrogen in sloping farmland converted from original grassland in Tibetan plateau
Nie Xiaojun1; Wang Xiaodan2,3; Liu Suzhen2,3; Gu Shixian2,3; Liu Haijun4
Corresponding AuthorNie, XJ
2010
Source PublicationAPPLIED RADIATION AND ISOTOPES
ISSN0969-8043
Volume68Issue:9Pages:1650-1655
SubtypeArticle
AbstractThere is a shortage of research concerning the relationships between land-use change, soil erosion, and soil organic carbon (SOC) and nitrogen (N) dynamics in alpine environments such as those found in the Tibetan plateau. In this paper, typical sloping farmlands converted from grassland 50 years ago in eastern Tibet were selected to determine dynamics of soil erosion, SOC, and total N associated with land-use change. Soil samples were collected from sloping farmland and control fields (grassland). The Cs-137, SOC, total N contents, and soil particle size fractions were analyzed in these samples. As compared with the control fields, Cs-137, SOC, and total N inventories in the sloping farmlands decreased by 30%, 27%, and 33%, respectively. Meanwhile variations in the three parameters were enhanced in the sloping farmlands, with coefficients of variation (CVs) of 38%, 23%, and 20%, respectively, for Cs-37, SOC, and total N. In addition, SOC and total N inventories significantly decreased with increasing soil erosion in the sloping farmland. In a sloping farmland with a steep 24 degrees gradient, the Cs-137 inventory gradually increased along a downslope transect with its lowest value at 0 Bq m(-2) in the top-slope position (0 m). The soil clay (<0.002 mm) content in such an area increased with decreasing elevation (r=-0.95, p=0.001). Significant correlations between Cs-137 and clay (r=0.92, p=0.003), SOC (r=0.96, p=0.001), or total N (r=0.95, p=0.001) were also found in the farmland. These results showed that converting alpine grassland to sloping farmland accelerates soil erosion, losses in SOC and N, and increases the soil's spatial variability. The combined impacts of tillage and water erosion contributed a significant decrease in the soil's organic carbon and N storages. Particularly in steep sloping farmlands, tillage erosion contributed for severe soil loss, but the soil redistribution pattern was dominated by water erosion, not tillage erosion, due to the lack of boundaries across the field patches. It was also found that Cs-137, SOC, and total N moved along the same pathway within these sloping farmlands, resulting in net C and N losses during soil redistribution. The negative influences of land-use conversion from grassland to farmland in sloping areas in the Tibetan plateau should be addressed. Copyright (C) 2010 Elsevier Ltd. All rights reserved.
KeywordCs-137 Technique Land-use Change Soc Water Erosion Tillage Erosion Tibetan Plateau
WOS HeadingsScience & Technology ; Physical Sciences ; Technology ; Life Sciences & Biomedicine
DOI10.1016/j.apradiso.2010.04.017
WOS Subject ExtendedChemistry ; Nuclear Science & Technology ; Radiology, Nuclear Medicine & Medical Imaging
Indexed BySCI
WOS KeywordLAND-USE ; FOREST ECOSYSTEM ; TILLAGE EROSION ; STEEP HILLSLOPE ; MATTER ; REDISTRIBUTION ; CHINA ; QUALITY ; PRODUCTIVITY ; CULTIVATION
Language英语
Quartile3区
TOP
WOS SubjectChemistry, Inorganic & Nuclear ; Nuclear Science & Technology ; Radiology, Nuclear Medicine & Medical Imaging
WOS IDWOS:000279415800009
Funding OrganizationScience and Technology Project of China(2007BAC06B06 ; Program for Science and Technology Innovation Talents at the Universities of Henan Province(2008HAST1T004) ; 2007BAC06B08)
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5583
Collection山地表生过程与生态调控重点实验室
Affiliation1.Henan Polytech Univ, Sch Surveying & Land Informat Engn, Jiaozuo 454000, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
3.Minist Water Conservat, Chengdu 610041, Peoples R China
4.Inst Water Resources Planning Surveying Design &, Lhasa 850000, Peoples R China
Recommended Citation
GB/T 7714
Nie Xiaojun,Wang Xiaodan,Liu Suzhen,et al. Cs-137 tracing dynamics of soil erosion, organic carbon and nitrogen in sloping farmland converted from original grassland in Tibetan plateau[J]. APPLIED RADIATION AND ISOTOPES,2010,68(9):1650-1655.
APA Nie Xiaojun,Wang Xiaodan,Liu Suzhen,Gu Shixian,&Liu Haijun.(2010).Cs-137 tracing dynamics of soil erosion, organic carbon and nitrogen in sloping farmland converted from original grassland in Tibetan plateau.APPLIED RADIATION AND ISOTOPES,68(9),1650-1655.
MLA Nie Xiaojun,et al."Cs-137 tracing dynamics of soil erosion, organic carbon and nitrogen in sloping farmland converted from original grassland in Tibetan plateau".APPLIED RADIATION AND ISOTOPES 68.9(2010):1650-1655.
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