Identification on threshold and efficiency of rainfall replenishment to soil water in semi-arid loess hilly areas

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

	Identification on threshold and efficiency of rainfall replenishment to soil water in semi-arid loess hilly areas
	Zhang, Handan; Chen, Liding; Yang, Lei
刊名	SCIENCE CHINA-EARTH SCIENCES
	2018-03-01
卷号	61 期号:3 页码:292-301
关键词	Vegetation rehabilitation Soil water Lag-time of rainfall replenishment Efficiency of rainfall replenishment Threshold of rainfall replenishment
ISSN号	1674-7313
文献子类	Article
英文摘要	As one critical source of water for maintaining ecosystems in arid and semi-arid regions, rainfall replenishment to soil water can determine vegetation growth and ecosystem functions. However, the limited rainfall resources were often not used effectively in the semi-arid loess hilly areas due to random temporal and spatial distribution of rainfall and specific vegetation features. Thus, it is highly significant to determine the threshold and efficiency of rainfall replenishment to soil water under different vegetation types. The threshold and efficiency can offer scientific evidence for rehabilitating vegetation and improving efficiency of using rainfall resources. In this study, the efficiency and threshold of rainfall replenishment to soil water were determined under natural grassland, wheat, artificial grassland, sea buckthorn shrubland and Chinese pine forestland based on consecutive measurements. The results indicated that the lag-time, rate, efficiency of rainfall replenishment to soil water were closely related to vegetation type, with significant differences existing among different vegetation types. The lag-time for natural grassland in the soil horizon of 20 cm was the shortest one (26.4 h), followed by wheat (27.8 h), sea buckthorn (41.8 h), artificial grassland (50.0 h) and Chinese pine (81.8 h).The value of replenishment rate, followed the order of wheat (0.40 mm h(-1))> natural grassland (0.30 mm h(-1))> sea buckthorn (0.17 mm h(-1))> artificial grassland (0.14 mm h(-1))> Chinese pine (0.09 mm h(-1)). As for the efficiency of rainfall replenishment to soil water, natural grassland was the most efficient one (35.1%), followed by wheat (29.2%), sea buckthorn (16.8%), artificial grassland (11.5%), Chinese pine (4.2%). At last, it was found that wheat had the lowest threshold (6.8 mm) of rainfall replenishment to soil water, which was followed by natural grassland (10.5 mm), sea buckthorn (20.5 mm), artificial grassland (22.6 mm) and Chinese pine (26.4 mm). These results implied that soil water in natural grassland was sensitive to rainfall and easily to be replenished, while soil water in Chinese pine was harder to be replenished by rainfall compared to other vegetation types.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/40571]
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	Zhang, Handan,Chen, Liding,Yang, Lei. Identification on threshold and efficiency of rainfall replenishment to soil water in semi-arid loess hilly areas[J]. SCIENCE CHINA-EARTH SCIENCES,2018,61(3):292-301.
APA	Zhang, Handan,Chen, Liding,&Yang, Lei.(2018).Identification on threshold and efficiency of rainfall replenishment to soil water in semi-arid loess hilly areas.SCIENCE CHINA-EARTH SCIENCES,61(3),292-301.
MLA	Zhang, Handan,et al."Identification on threshold and efficiency of rainfall replenishment to soil water in semi-arid loess hilly areas".SCIENCE CHINA-EARTH SCIENCES 61.3(2018):292-301.