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Responses of water yield to changes in vegetation at a temporal scale

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The effect of vegetation on the water recycling of a land ecological system is considerably significant.Understanding the relationship between vegetation and runoff changes will benefit regional eco-environmental and water resources management. Based on paired catchments and time trend studies, a number of studies had been undertaken to establish the relationship between vegetation cover and water yield. We obtained some results from paired watersheds by focusing on changes at various time scales. At the mean annual scale the runoff changes resulting from vegetation alteration can be predicted using Zhang's curves. The absolute change of runoff due to vegetation alteration in a humid area is larger than that in the dry region, while the relative change is reverse. At the annual scale, it takes 15-20 years or longer in the arid region for catchments to reach a new equilibrium after afforestation,and under natural restoration, it takes about a hundred years.The vegetation changes have a proportionally larger impact on low flow at the seasonal scale. For catchments in arid regions,relative changes in low flow sections of the flow duration curve will be much more significant compared with that in the high flow section, leading to increased number of zero-flow days. However, in humid regions, changes in runoff tend to be much more uniform.

temporal scalechanges in vegetationstream flow responseflow duration curvepaired catchments studies

Zhaoliang GAO、Zhan ZHANG、Xiaoping ZHANG

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Institute of Soil and Water Conservation, Northwest A&F University,Chinese Academy of Sciences, Yangling 712100, China

impact of land use/land cover change on the stream flow and sediment in the He-Long section of the Loess Plateau, ChinaInternational Cooperative project Regional impacts of revegetation on water resources of the Loess Plateau, ChinaMiddle and Upper Murrumbidgee catchment, Australia

B183LWR/2002/018

2009

10.1007/s11461-009-0008-4

中国高等学校学术文摘·林学
高等教育出版社

中国高等学校学术文摘·林学

ISSN：1673-3517
年,卷(期)：2009.4(1)
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