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Using(137)Cs and(210)Pb(ex)to trace soil erosion rates for a small catchment in the mid-hills of Nepal

文献类型：期刊论文

作者Yuan, Yong4,5; Xiong, Donghong2,4,6; Wu, Han4,5; Liu, Lin4,5; Li, Wanxin4,5; Chidi, Chhabi Lal2,3,6; Dahal, Nirmal Mani4,5; Neupane, Nilhari1
刊名JOURNAL OF SOILS AND SEDIMENTS
出版日期2020-08-19
页码16
ISSN号1439-0108
关键词Radionuclides Soil redistribution Land use Shrub land Sloping farmland
DOI10.1007/s11368-020-02760-7
通讯作者Xiong, Donghong(dhxiong@imde.ac.cn)
英文摘要Purpose Soil erosion is a major threat to agricultural sustainability in the hills of Nepal. However, little is known about the soil erosion rates at a small catchment scale in this region. Materials and methods In this study, the soil redistribution rates in a typical small hilly catchment in the Ramechhap District of Nepal were evaluated using the(137)Cs and(210)Pb(ex)tracer techniques. Nine representative slopes under three land uses and a reference site from the gentle sloping forest land within the catchment were selected as sample plots. A downhill transect was built in each sample plot, and soil samples were collected at 5-m intervals along the transects. Results and discussion The results showed that the spatial variations in radionuclide inventory and soil erosion rates measured by(137)Cs measurements were highly consistent with equivalent estimates from(210)Pb(ex)measurements, suggesting the potential for using(137)Cs and(210)Pb(ex)measurements to estimate soil redistribution rates. All(137)Cs and(210)Pb(ex)inventories on the slopes were less than the reference values, indicating that net soil loss has occurred at all of the sampling points. The net erosion rates from sloping farmland (37.08 t ha(-1)year(-1)) and shrub land (32.52 t ha(-1)year(-1)) were significantly higher than those from forest land (14.91 t ha(-1)year(-1)). Furthermore, the soil erosion rates obtained from(210)Pb(ex)measurements were higher than those obtained from(137)Cs measurements, which implies that soil erosion in the catchment was accelerated during the last two decades. The net soil loss from the study catchment was estimated to be 31.29 t ha(-1)year(-1), which is mainly contributed by shrub land (55.08%) and sloping farmland (37.68%). Conclusions These results indicate that shrub land and sloping farmland are vulnerable to erosion, which should be specifically considered in the sustainable management of small agricultural catchments in the mid-hills of Nepal, especially in dry valley regions.
WOS关键词LAND-USE ; REDISTRIBUTION RATES ; SEDIMENT DELIVERY ; MIDDLE MOUNTAINS ; CLIMATE-CHANGE ; LOESS PLATEAU ; RUNOFF ; CS-137 ; SLOPE ; CESIUM-137
资助项目special project from Branch of Sustainable Mountain Development, Kathmandu Center for Research and Education, CAS-TU ; NSFC-ICIMOD Joint Research Project[41661144038]
WOS研究方向Environmental Sciences & Ecology ; Agriculture
语种英语
出版者SPRINGER HEIDELBERG
WOS记录号WOS:000567310400002
资助机构special project from Branch of Sustainable Mountain Development, Kathmandu Center for Research and Education, CAS-TU ; NSFC-ICIMOD Joint Research Project
源URL[http://ir.igsnrr.ac.cn/handle/311030/156859]  
专题中国科学院地理科学与资源研究所
通讯作者Xiong, Donghong
作者单位1.Int Ctr Integrated Mt Dev, Khumaltar 3226, Lalitpur Gpo, Nepal
2.IMHE TU YNU, Sino Nepal Joint Res Ctr Geog, Kathmandu 44600, Nepal
3.Tribhuvan Univ, Cent Dept Geog, Kathmandu 44600, Nepal
4.Chinese Acad Sci & Minist Water Resources, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.CAS TU, Branch Sustainable Mt Dev, Kathmandu Ctr Res & Educ, Kathmandu 44600, Nepal
推荐引用方式
GB/T 7714		 Yuan, Yong,Xiong, Donghong,Wu, Han,et al. Using(137)Cs and(210)Pb(ex)to trace soil erosion rates for a small catchment in the mid-hills of Nepal[J]. JOURNAL OF SOILS AND SEDIMENTS,2020:16.
APA Yuan, Yong.,Xiong, Donghong.,Wu, Han.,Liu, Lin.,Li, Wanxin.,...&Neupane, Nilhari.(2020).Using(137)Cs and(210)Pb(ex)to trace soil erosion rates for a small catchment in the mid-hills of Nepal.JOURNAL OF SOILS AND SEDIMENTS,16.
MLA Yuan, Yong,et al."Using(137)Cs and(210)Pb(ex)to trace soil erosion rates for a small catchment in the mid-hills of Nepal".JOURNAL OF SOILS AND SEDIMENTS (2020):16.

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来源：地理科学与资源研究所

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