Evaluating gully erosion using  and / ratio in a reservoir catchment

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 > 山地表生过程与生态调控重点实验室

	Evaluating gully erosion using and / ratio in a reservoir catchment
	Y Li; J Poesen; J.C Yang; B Fu; J.H Zhang
刊名	Soil and Tillage Research
	2003
卷号	69 期号:1-2 页码:107-115
关键词	Cesium-137 / ratio Gully erosion Sediment production Land use Chinese Loess Plateau
ISSN号	0009-2673
通讯作者	Y Li
合作状况	国际
英文摘要	Water erosion in the hilly areas of west China is the main process contributing to the overall sediment of the Yellow River and the Yangtze River. The impact of gully erosion in total sediment output has been mostly neglected. Our objective was to assess the sediment production and sediment sources at both the hillslope and catchment scales in the Yangjuangou reservoir catchment of the Chinese Loess Plateau, northwest China. Distribution patterns in sediment production caused by water erosion on hills and gully slopes under different land use types were assessed using the fallout technique. The total sediment production from the catchment was estimated by using the sediment record in a reservoir. Sediment sources and dominant water erosion processes were determined by comparing activities and / ratios in surface soils and sub-surface soils with those of sediment deposits from the reservoir at the outlet of the catchment. Results indicated that landscape location had the most significant impact on sediment production for cultivated hillslopes, followed by the terraced hillslope, and the least for the vegetated hillslope. Sediment production increased in the following order: top>upper>lower>middle for the cultivated hillslope, and top>lower>upper>middle for the terraced hillslope. The mean value of sediment production declined by 49% for the terraced hillslope and by 80% for the vegetated hillslope compared with the cultivated hillslope. Vegetated gully slope reduced the sediment production by 38% compared with the cultivated gully slope. These data demonstrate the effectiveness of terracing and perennial vegetation cover in controlling sediment delivery at a hillslope scale. Averaged activities and / ratios in the 0–5 cm surface soil (2.22–4.70 Bq kg−1 and 20.70–22.07, respectively) and in the 5–30 cm subsoil (2.60 Bq kg−1 and 28.57, respectively) on the cultivated hills and gully slopes were close to those of the deposited sediment in the reservoir (3.37 Bq kg−1 and 29.08, respectively). These results suggest that the main sediment sources in the catchment were from the surface soil and subsoil on the cultivated slopes, and that gully erosion is the dominant water erosion process contributing sediment in the study area. Changes in land use types can greatly affect sediment production from gully erosion. An increase in grassland and forestland by 42%, and a corresponding decrease in farmland by 46%, reduced sediment production by 31% in the catchment.
语种	英语
WOS记录号	WOS:000347870100024
公开日期	2014-05-09
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/6913]
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
推荐引用方式 GB/T 7714	Y Li,J Poesen,J.C Yang,et al. Evaluating gully erosion using and / ratio in a reservoir catchment[J]. Soil and Tillage Research,2003,69(1-2):107-115.
APA	Y Li,J Poesen,J.C Yang,B Fu,&J.H Zhang.(2003).Evaluating gully erosion using and / ratio in a reservoir catchment.Soil and Tillage Research,69(1-2),107-115.
MLA	Y Li,et al."Evaluating gully erosion using and / ratio in a reservoir catchment".Soil and Tillage Research 69.1-2(2003):107-115.