Use of 137Cs and 210Pbex measurements on deposits in a karst depression to study the erosional response of a small karst catchment in Southwest China to land-use change
文献类型：期刊论文
| 作者 | Bai, Xiaoyong1,2; Zhang, Xinbao1,2 ; Long, Yi2; Liu, Xiuming1; Zhang Siyu1,3
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| 刊名 | HYDROLOGICAL PROCESSES
 |
| 出版日期 | 2013-03-15 |
| 卷号 | 27期号:6页码:822-829 |
| ISSN号 | 0885-6087 |
| 关键词 | karst depression sedimentation 137Cs 210Pbex erosion land-use change deforestation |
| 通讯作者 | Zhang Xinbao |
| 英文摘要 | Karst depressions represent important sinks for sediment, and such sediment can provide a valuable record of the impact of environmental change on soil erosion rates. However, the sediment dynamics of karst depressions are not well understood. This contribution reports a study of the small catchment of a karst depression in Southwest China, with a drainage area of 0.054km2, aimed at using the sediment deposits in the depression to reconstruct the erosional response of the catchment to land-use change and, more particularly, the deforestation which took place in 1979. 137Cs and 210Pbex are used as both chronometers and as tracers. Five cores, collected from the bottom of a depression, with an area of 2652m2, showed similar 137Cs depth distributions, with a single 137Cs peak, which was attributed to the 1979 deforestation. The 137Cs activity associated with the peaks varied between 5.68 +/- 0.64 and 9.19 +/- 0.99Bqkg1. The average depth of sediment deposition between 1979 and 2008 deduced from the depths of the 1979 137Cs peak was 74.1cm. The existence of relatively high 210Pbex activity of 66.33 +/- 8.44Bqkg1 in the upper section (016cm) of the core analyzed for 210Pbex suggests that recent sedimentation has been very limited. Net erosion rates on the hillslopes contributing runoff and sediment t to the depression were estimated to be 5258tkm2year1 from 1979 to 1990 and 256tkm2year1 from 1991 to 2008, respectively. The high sediment yield in the first period was associated with the severe soil erosion triggered by the 1979 deforestation, which resulted from the changes in land ownership immediately after the Cultural Revolution. Soil erosion has been very limited since 1990 because the thin soils had been totally removed from many parts of the karst slopes and the soils remaining on the other parts of the slopes have been protected by terracing or vegetation rehabilitation. Copyright (c) 2012 John Wiley & Sons, Ltd. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Water Resources |
| 研究领域[WOS] | Water Resources |
| 关键词[WOS] | SEDIMENTATION-RATES ; LAKE-SEDIMENTS ; CS-137 ; PB-210 ; FLOODPLAINS ; PROFILES ; BE-7 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000315924300006 |
| 公开日期 | 2013-06-24 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/5447]  |
| 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.Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550002, Guizhou, Peoples R China 2.Chinese Acad Sci, Key Lab Mt Environm Evolut & Regulat, Inst Mt Hazards & Environm Chengdu, Chengdu 610041, Sichuan, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bai, Xiaoyong,Zhang, Xinbao,Long, Yi,et al. Use of 137Cs and 210Pbex measurements on deposits in a karst depression to study the erosional response of a small karst catchment in Southwest China to land-use change[J]. HYDROLOGICAL PROCESSES,2013,27(6):822-829. |
| APA | Bai, Xiaoyong,Zhang, Xinbao,Long, Yi,Liu, Xiuming,&Zhang Siyu.(2013).Use of 137Cs and 210Pbex measurements on deposits in a karst depression to study the erosional response of a small karst catchment in Southwest China to land-use change.HYDROLOGICAL PROCESSES,27(6),822-829. |
| MLA | Bai, Xiaoyong,et al."Use of 137Cs and 210Pbex measurements on deposits in a karst depression to study the erosional response of a small karst catchment in Southwest China to land-use change".HYDROLOGICAL PROCESSES 27.6(2013):822-829. |
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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