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Cs-137 Tracing Dynamics of Soil Erosion, Organic Carbon, and Total Nitrogen in Terraced Fields and Forestland in the Middle Mountains of Nepal
Language英语
Su Zhengan1; Xiong Donghong1; Deng Wei2; Dong Yifan1; Ma Jing3; Padma Poudel C.4; Gurung Sher B.4
Source PublicationLAND COVER CHANGE AND ITS ECO-ENVIRONMENTAL RESPONSES IN NEPAL
EditorLi A ; Deng W ; Zhao W
Pages243-259
2017
PublisherSPRINGER
Publication PlaceSingapore
KeywordNepal Cs-137 inventory Soil erosion/deposition Soil organic carbon Total nitrogen
Indexed ByBKCI-S
AbstractThe 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.
ISBN978-981-10-2890-8; 978-981-10-2889-2
ISSN2194-315X
DOI10.1007/978-981-10-2890-8_11
WOS IDWOS:000432241500012
Citation statistics
Document Type专著章节文集论文
Identifierhttp://ir.imde.ac.cn/handle/131551/33446
Collection山地灾害与地表过程重点实验室
山区发展研究中心
Corresponding AuthorSu Zhengan
Affiliation1.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
Recommended Citation
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.
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