Cs-137 tracing dynamics of soil erosion, organic carbon, and total nitrogen in terraced fields and forestland in the Middle Mountains of Nepal

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2016 > Vol13 NO.10

	Cs-137 tracing dynamics of soil erosion, organic carbon, and total nitrogen in terraced fields and forestland in the Middle Mountains of Nepal
	Su Zheng-an1 ; Xiong Dong-hong1 ; Deng Wei1,2 ; Dong Yi-fan1 ; Ma Jing 3; Padma, C. Poudel 4; Gurung, B. Sher 4
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2016-10-01
卷号	13 期号:10 页码:1829-1839
关键词	Nepal Cs-137 inventory Soil erosion/deposition Soil organic carbon Total nitrogen
ISSN号	1672-6316
通讯作者	SU Zheng-an
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 m and 20 m intervals along terraced field series and forestland transects respectively. Mean 137Cs inventories of the four soil cores from the reference site was 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.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Environmental Sciences
研究领域[WOS]	Environmental Sciences & Ecology
关键词[WOS]	TILLAGE EROSION ; SUSPENDED SEDIMENT ; CULTIVATED LAND ; YANGTZE-RIVER ; CHINA ; REDISTRIBUTION ; HEDGEROWS ; TRANSLOCATION ; ERODIBILITY ; CATCHMENTS
收录类别	SCI
语种	英语
WOS记录号	WOS:000386502400011
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/17590]
专题	成都山地灾害与环境研究所_Journal of Mountain Science _Journal of Mountain Science-2016_Vol13 NO.10 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
作者单位	1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Sichuan Agr Univ, Coll Water Conservancy & Hydropower Engn, Yaan 625014, Peoples R China 4.Tribhuvan Univ, Cent Dept Geog, Univ Campus, Kirtipur 8212, Nepal
推荐引用方式 GB/T 7714	Su Zheng-an,Xiong Dong-hong,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[J]. JOURNAL OF MOUNTAIN SCIENCE,2016,13(10):1829-1839.
APA	Su Zheng-an.,Xiong Dong-hong.,Deng Wei.,Dong Yi-fan.,Ma Jing.,...&Gurung, B. Sher.(2016).Cs-137 tracing dynamics of soil erosion, organic carbon, and total nitrogen in terraced fields and forestland in the Middle Mountains of Nepal.JOURNAL OF MOUNTAIN SCIENCE,13(10),1829-1839.
MLA	Su Zheng-an,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".JOURNAL OF MOUNTAIN SCIENCE 13.10(2016):1829-1839.