Effects of surficial condition and rainfall intensity on runoff in a loess hilly area, China

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Effects of surficial condition and rainfall intensity on runoff in a loess hilly area, China
	Wei, Wei ; Jia, Fuyan ; Yang, Lei ; Chen, Liding ; Zhang, Handan ; Yu, Yang
刊名	JOURNAL OF HYDROLOGY
	2014
卷号	513 期号:1 页码:115-126
关键词	Runoff Rainfall simulation Water loss Plant species Vegetation position Surface cover
ISSN号	0022-1694
中文摘要	Knowledge of the so-called "source-sink" pattern of surface runoff is important for soil conservation, water resources management and vegetation restoration in the dry-land ecosystems. Micro-runoff plot and rainfall simulation are effective tools in quick understanding the relations between land surface and runoff dynamics. This study made full use of these tools to examine the effect of various factors (plant species, surface cover, vegetation distribution) on runoff generation in the semiarid loess hilly area of China. Two major simulated rainfall intensities (52 mm h(-1) and 28 mm h(-1)) were designed and conducted, which can represent heavy rainstorms and moderate rainfalls in the local region, respectively. Results showed that the responses of runoff generation and dynamics were far more sensitive to high-intensity rainfalls. Rainfall events with only 1.8 times an increase in intensity and 16% decrease in duration caused a sharp increase in total discharge (13.96 times), runoff depth (16.33 times), mean flow velocity (12.17 times), peak flow velocity (9.34 times) and runoff coefficient (9.23 times), respectively. The time to runoff generation however, was shortened by 70%, which raised the alarm to caution against the risks of hydrological disasters induced by potential rainfall variation in the context of climatic change. More importantly, different plant species and surface cover play various roles in runoff generation and processes. Due to the difference in plant morphology and effective surface cover, runoff delay, total discharge retention and peak-flow reduction with shrubs (seabuckthom) were more effective than those with secondary natural grass, followed by biological crust and bare soil. Notably, the specific positions of shrub species along the slope affects the time to runoff, specific flow process and total volume significantly. Shrubs in the lower positions acted as more powerful buffers in preventing runoff generation and surface water loss. Such findings can provide important references for runoff control, water conservation and ecosystem restoration regarding plant selection and vegetative collocation in practice in the arid and semiarid environments. (C) 2014 Elsevier B.V. All rights reserved.
WOS记录号	WOS:000337258900012
公开日期	2015-03-23
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/9151]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Wei, Wei,Jia, Fuyan,Yang, Lei,et al. Effects of surficial condition and rainfall intensity on runoff in a loess hilly area, China[J]. JOURNAL OF HYDROLOGY,2014,513(1):115-126.
APA	Wei, Wei,Jia, Fuyan,Yang, Lei,Chen, Liding,Zhang, Handan,&Yu, Yang.(2014).Effects of surficial condition and rainfall intensity on runoff in a loess hilly area, China.JOURNAL OF HYDROLOGY,513(1),115-126.
MLA	Wei, Wei,et al."Effects of surficial condition and rainfall intensity on runoff in a loess hilly area, China".JOURNAL OF HYDROLOGY 513.1(2014):115-126.