Cs-137 tracing dynamics of soil erosion, organic carbon and nitrogen in sloping farmland converted from original grassland in Tibetan plateau
文献类型：期刊论文
| 作者 | Nie Xiaojun1; Wang Xiaodan2,3 ; Liu Suzhen2,3; Gu Shixian2,3; Liu Haijun4
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| 刊名 | APPLIED RADIATION AND ISOTOPES
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| 出版日期 | 2010-09-01 |
| 卷号 | 68期号:9页码:1650-1655 |
| 关键词 | Cs-137 technique Land-use change SOC Water erosion Tillage erosion Tibetan plateau |
| ISSN号 | 0969-8043 |
| 通讯作者 | Nie, XJ |
| 英文摘要 | There 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. |
| WOS标题词 | Science & Technology ; Physical Sciences ; Technology ; Life Sciences & Biomedicine |
| 类目[WOS] | Chemistry, Inorganic & Nuclear ; Nuclear Science & Technology ; Radiology, Nuclear Medicine & Medical Imaging |
| 研究领域[WOS] | Chemistry ; Nuclear Science & Technology ; Radiology, Nuclear Medicine & Medical Imaging |
| 关键词[WOS] | LAND-USE ; FOREST ECOSYSTEM ; TILLAGE EROSION ; STEEP HILLSLOPE ; MATTER ; REDISTRIBUTION ; CHINA ; QUALITY ; PRODUCTIVITY ; CULTIVATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000279415800009 |
| 公开日期 | 2013-07-05 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/5583]  |
| 专题 | 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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