Effect of forest on annual water yield in the mountains of an arid inland river basin: a case study in the Pailugou catchment on northwestern China's Qilian Mountains
Effect of forest on annual water yield in the mountains of an arid inland river basin: a case study in the Pailugou catchment on northwestern China's Qilian Mountains
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DOI：
10.1002/hyp.8162
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发表时间：
2012-02
影响因子：
3.2
通讯作者：
Zhi-bin He;Wenzhi Zhao;Hu Liu;Zhenxing Tang
中科院分区：
文献类型：
--
作者：
Zhi-bin He;Wenzhi Zhao;Hu Liu;Zhenxing Tang
尽管经过多年的研究，森林对年产水量的影响仍然是森林水文学中尚未解决的核心问题。对干旱内陆河流域山区的研究尤其缺乏。在本研究中，我们利用 1994 年至 2008 年中国西北祁连山牌路沟流域的降水量、蒸发量、冠层截留量、蒸腾量和径流数据，研究了森林对水文的影响。我们对水平衡进行了建模，以评估不同植被类型对年产水量的贡献。研究区青海云杉林覆盖了流域面积的38·5%，但对年产水量贡献甚微。海拔2700 m，年平均降水量407·1毫米（2003年至2008年），森林径流深度为11·6毫米，仅占流域年总产水量的3·5%。年平均降水量为 374·1 毫米（1994 年至 2002 年），森林径流深度为 − 14·3 毫米（即流域年总水量的 5·9% 用于维持树木生长）。这具有重大意义，因为祁连山越来越多地种植森林，这可能会减少下游的供水。因此，必须更好地理解森林和水产量之间的关系，以便建立适当的区域森林覆盖水平。版权所有 © 2011 约翰·威利父子有限公司
The effect of forests on annual water yield is an unresolved central issue in forest hydrology despite years of study. There has been a particular shortage of research in the mountains of arid inland river basins. In the present study, we examined the effects of forests on hydrology using data on precipitation, evaporation, canopy interception, transpiration, and runoff from 1994 to 2008 for the Pailugou catchment of northwestern China's Qilian Mountains. We modelled the water balance to assess the contribution of different vegetation types to annual water yield. In our study area, Picea crassifolia forest covered 38·5% of the catchment area, but contributed little to annual water yield. For an annual average precipitation of 407·1 mm (from 2003 to 2008) at an elevation of 2700 m, the runoff depth from the forest was 11·6 mm, accounting for only 3·5% of total annual water yield of the catchment. For an annual average precipitation of 374·1 mm (from 1994 to 2002), the runoff depth from the forest was − 14·3 mm (i.e. 5·9% of total annual water yield of the catchment was consumed to sustain tree growth). This has significant implications, because forests are increasingly being planted in the Qilian Mountains, and this may decrease the downstream water supply. Thus, the relationship between the forest and water yield must be better understood to permit the establishment of an appropriate regional level of forest cover. Copyright © 2011 John Wiley & Sons, Ltd.