Landform change due to soil redistribution by intense tillage based on high-resolution DEMs

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

	Landform change due to soil redistribution by intense tillage based on high-resolution DEMs
	Su, Z. A.1 ; Zhang, J. H.1 ; Qin, F. C.2; Nie, X. J.3
刊名	GEOMORPHOLOGY
	2012-11-15
卷号	175 页码:190-198
关键词	Tillage erosion model DEM Landform change Three Gorges Reservoir region China
ISSN号	0169-555X
通讯作者	Zhang, J.H.
英文摘要	Tillage erosion is considered to be one of the most widespread forms of soil erosion on sloping agricultural land, yet little attention has been paid to the impact of tillage erosion on landform change. This study assessed the rates of tillage erosion caused by manual hoeing and evaluated the impacts of medium-term tillage erosion on landform change on slopes with linear and complex forms in the Three Gorges Reservoir region, China. To quantify the tillage erosion rate without the influence of water erosion, a series of tillage experiments were set up and an on-site survey was conducted during the dry season of 2008. The tillage erosion rates on the linear and complex slopes were assessed using high-resolution digital elevation models (DEMs), a step profile method and a tillage erosion model. The erosion rates from the step profile method were 16.8 and 36.6 Mg ha(-1) tillage pass(-1) on the linear and complex slopes, respectively, and those deduced from the tillage erosion model were 17.6 and 41.7 Mg ha(-1) tillage pass(-1). After intense tillage, the most notable changes in soil depth occurred at the summit and toe positions, with a decrease of 100% at the 0-m position (summit) and an increase of 13.1% and 30.9% after 5- and 15-operation tillage, respectively, at the toeslope position on the linear slope. On the complex slope, a 100% reduction in soil depth was observed at the summit; the largest increase in soil depth appeared at the toeslope position after 5- and 15-operation tillage by 23.1% and 48.2%, respectively; and a significant decrease in soil depth at the shoulder slope also occurred. For the linear slope, the slope gradient gradually decreased due to intense tillage, and the landform could be referred to as slow-forming terraces where no severe water erosion occurred at the lower slope positions. Additionally, insignificant changes in the slope gradient occurred at the flat summit slope positions, whereas significant soil accumulation at the toeslope positions caused an obvious reduction of the slope gradients on the complex slope. This indicates that intensive tillage results in a gradual smoothening of the slopes. Furthermore, tillage erosion altered the soil profiles leading to the truncation, the mixing of soil profiles and the formation of new soil profiles at different slope positions. Overall, these results clearly indicate that tillage erosion is one of the important soil redistribution processes, and hoeing tillage plays a dominant role in landform change. (C) 2012 Elsevier B.V. All rights reserved.
学科主题	水土保持学
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geography, Physical ; Geosciences, Multidisciplinary
研究领域[WOS]	Physical Geography ; Geology
关键词[WOS]	TOPOGRAPHICALLY COMPLEX LANDSCAPES ; EROSION RATES ; SICHUAN BASIN ; STEEP SLOPES ; CHINA ; TRANSLOCATION ; EVOLUTION ; MODEL ; WATER ; PLOW
收录类别	SCI
语种	英语
WOS记录号	WOS:000309848500018
公开日期	2012-12-11
内容类型	期刊论文
源URL	[http://192.168.143.20:8080/handle/131551/4417]
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
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.China W Normal Univ, Nanchong 637002, Peoples R China 3.Henan Polytech Univ, Sch Surveying & Land Informat Engn, Jiaozuo 454000, Peoples R China
推荐引用方式 GB/T 7714	Su, Z. A.,Zhang, J. H.,Qin, F. C.,et al. Landform change due to soil redistribution by intense tillage based on high-resolution DEMs[J]. GEOMORPHOLOGY,2012,175:190-198.
APA	Su, Z. A.,Zhang, J. H.,Qin, F. C.,&Nie, X. J..(2012).Landform change due to soil redistribution by intense tillage based on high-resolution DEMs.GEOMORPHOLOGY,175,190-198.
MLA	Su, Z. A.,et al."Landform change due to soil redistribution by intense tillage based on high-resolution DEMs".GEOMORPHOLOGY 175(2012):190-198.