Cs-137 Tracing Dynamics of Soil Erosion, Organic Carbon, and Total Nitrogen in Terraced Fields and Forestland in the Middle Mountains of Nepal
文献类型：专著章节文集论文
| 语种 | 英语 |
| 作者 | Su Zhengan1 ; Xiong Donghong1; Deng Wei2; Dong Yifan1; Ma Jing3; Padma Poudel C.4; Gurung Sher B.4
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| 出处 | LAND COVER CHANGE AND ITS ECO-ENVIRONMENTAL RESPONSES IN NEPAL |
| 发表日期 | 2017 |
| 页码 | 243-259 |
| 出版者 | SPRINGER |
| 出版地 | Singapore |
| 关键词 | Nepal Cs-137 inventory Soil erosion/deposition Soil organic carbon Total nitrogen |
| 英文摘要 | The Middle Mountains is one of the regions of Nepal most vulnerable to water erosion, where fragile geology, steep topography, anomalous climatic conditions, and intensive human activity have resulted in serious soil erosion and enhanced land degradation. Based on the Cs-137 tracing method, spatial variations in soil erosion, organic carbon, and total nitrogen (TN) in terraced fields lacking field banks and forestland were determined. Soil samples were collected at approximately 5- and 20-m intervals along terraced field series and forestland transects, respectively. Mean Cs-137 inventories of the four soil cores from the reference site were estimated at 574.33 +/- 126.22 Bq m(-2) [1 Bq (i.e., one Becquerel) is equal to 1 disintegration per second (1 dps)]. For each terrace, the Cs-137 inventory generally increased from upper to lower slope positions, accompanied by a decrease in the soil erosion rate. Along the entire terraced toposequence, Cs-137 data showed that abrupt changes in soil erosion rates could occur between the lower part of the upper terrace and the upper part of the immediate terrace within a small distance. This result indicated that tillage erosion is also a dominant erosion type in the sloping farmland of this area. At the same time, we observed a fluctuant decrease in soil erosion rates for the whole terraced toposequence as well as a net deposition at the toe terrace. Although steep terraces (lacking banks and hedgerows) to some extent could act to limit soil sediment accumulation in catchments, soil erosion in the terraced field was determined to be serious. For forestland, with the exception of serious soil erosion that had taken place at the top of slopes due to concentrated flows from a country road situated above the forestland site, spatial variation in soil erosion was similar to the "standard" water erosion model. Soil organic carbon (SOC) and TN inventories showed similar spatial patterns to the Cs-137 inventory for both toposequences investigated. However, due to the different dominant erosion processes between the two, we found similar patterns between the <0.002 mm soil particle size fraction (clay sized) and Cs-137 inventories in terraced fields, while different patterns could be found between Cs-137 inventories and the <0.002 mm soil particle size fraction in the forestland site. Such results confirm that Cs-137 can successfully trace soil erosion, SOC, and soil nitrogen dynamics in steep terraced fields and forestland in the Middle Mountains of Nepal. |
| ISBN号 | 978-981-10-2890-8; 978-981-10-2889-2 |
| ISSN号 | 2194-315X |
| DOI标识 | 10.1007/978-981-10-2890-8_11 |
| WOS记录号 | WOS:000432241500012 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/33446]  |
| 专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 成都山地灾害与环境研究所_山区发展研究中心 |
| 通讯作者 | Su Zhengan |
| 作者单位 | 1.Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China; 2.Research Center for Mountain Development, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China; 3.College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya'an China; 4.Central Department of Geography, Tribhuvan University, Kirtipur,Nepa |
| 推荐引用方式 GB/T 7714 | Su Zhengan,Xiong Donghong,Deng Wei,et al. Cs-137 Tracing Dynamics of Soil Erosion, Organic Carbon, and Total Nitrogen in Terraced Fields and Forestland in the Middle Mountains of Nepal. LAND COVER CHANGE AND ITS ECO-ENVIRONMENTAL RESPONSES IN NEPAL. Singapore:SPRINGER,2017:243-259. |
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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