Influences of grass and moss on runoff and sediment yield on sloped loess surfaces under simulated rainfall

ISWC OpenIR > 水保所知识产出(1956---)

	Influences of grass and moss on runoff and sediment yield on sloped loess surfaces under simulated rainfall
	Pan Chengzhong; Shangguan Zhouping; Lei Tingwu; Shangguan, ZP
	2006
发表期刊	HYDROLOGICAL PROCESSES
卷号	20 期号:18 页码:3815-3824
摘要	It is important to evaluate the impacts of grasses on soil erosion process so as to use them effectively to control soil and water losses on the Loess Plateau. Laboratory-simulated rainfall experiments were conducted to investigate the runoff and sediment processes on sloped loess surfaces with and without the aboveground parts of grasses and moss (GAM: grass and moss; NGAM: no grass and moss) under slope gradients of 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees and 30 degrees. The results show that runoff from GAM and NGAM plots increased up to a slope gradient of 10 degrees and decreased thereafter, whereas the runoff coefficients increased with gradient. The average runoff rates and runoff coefficients of NGAM plots were less than those of GAM plots except for the 5 degrees slope. This behaviour may be due to the reduction in water infiltration under moss. The difference between GAM and NGAM plots in average runoff rates varied from 1.4 to 8%. At the same gradients, NGAM plots yielded significantly (alpha = 0.05) more sediment than GAM plots. Average sediment deliveries for different slopes varied from 0.119 to 3.794 g m(-2) min(-1) from GAM plots, and from 0.765 to 16.128 g m(-2) min(-1) from NGAM plots. Sediment yields from GAM plots were reduced by 45 to 85%, compared with those from the NGAM plots. Plots at 30 degrees yielded significantly higher sediments than at the other gradients. Total sediments S increased with slope gradients G in a linear form, i.e. S = 9.25G - 39.6 with R-2 = 0.77, for the GAM plots, and in an exponential model, i.e. S = 40.4 exp(0.1042G) with R-2 = 0.93*, for the NGAM plots. In all cases, sediment deliveries decreased with time, and reached a relative steady state at a rainfall duration of 14 min. Compared with NGAM plots, the final percentage reductions in sediment delivery from GAM plots were higher than those at the initial time of rainfall at all slopes. Copyright (c) 2006 John Wiley & Sons, Ltd.
关键词	Soil Erosion Grassland Moss Gradient Runoff Sediment
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/4888
专题	水保所知识产出(1956---)
通讯作者	Shangguan, ZP
推荐引用方式 GB/T 7714	Pan Chengzhong,Shangguan Zhouping,Lei Tingwu,et al. Influences of grass and moss on runoff and sediment yield on sloped loess surfaces under simulated rainfall[J]. HYDROLOGICAL PROCESSES,2006,20(18):3815-3824.
APA	Pan Chengzhong,Shangguan Zhouping,Lei Tingwu,&Shangguan, ZP.(2006).Influences of grass and moss on runoff and sediment yield on sloped loess surfaces under simulated rainfall.HYDROLOGICAL PROCESSES,20(18),3815-3824.
MLA	Pan Chengzhong,et al."Influences of grass and moss on runoff and sediment yield on sloped loess surfaces under simulated rainfall".HYDROLOGICAL PROCESSES 20.18(2006):3815-3824.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
第279条.pdf（140KB）			开放获取	使用许可	浏览下载