Analyzing precipitationsheds to understand the vulnerability of rainfall dependent regions
Analyzing precipitationsheds to understand the vulnerability of rainfall dependent regions
复制标题
DOI：
10.5194/bg-9-733-2012
复制
发表时间：
2012-01-01
期刊：
影响因子：
4.9
通讯作者：
Savenije, H. H. G.
中科院分区：
文献类型：
--
作者：
Keys, P. W.;van der Ent, R. J.;Savenije, H. H. G.
众所周知，河流连接流域内的上游和下游生态系统。在这里，我们描述的概念precipitationsheds显示如何逆风陆地蒸发源地区贡献降水的水分下风汇地区。我们说明了在precipitationsheds逆风土地覆盖的重要性，以维持降水在严重缺水的下风地区，特别是旱地农业区。我们首先确定了七个地区，其中农业是特别容易受到降水减少，然后绘制他们的precipitationsheds。然后，我们开发了一个框架，定性评估这七个农业区的降水脆弱性。我们说明，汇区有不同程度的脆弱性，逆风蒸发率的变化取决于precipitationshed，源区土地利用强度和预期的土地覆盖变化的程度在源区。
It is well known that rivers connect upstream and downstream ecosystems within watersheds. Here we describe the concept of precipitationsheds to show how upwind terrestrial evaporation source areas contribute moisture for precipitation to downwind sink regions. We illustrate the importance of upwind land cover in precipitationsheds to sustain precipitation in critically water stressed downwind areas, specifically dryland agricultural areas. We first identify seven regions where rainfed agriculture is particularly vulnerable to reductions in precipitation, and then map their precipitationsheds. We then develop a framework for qualitatively assessing the vulnerability of precipitation for these seven agricultural regions. We illustrate that the sink regions have varying degrees of vulnerability to changes in upwind evaporation rates depending on the extent of the precipitationshed, source region land use intensity and expected land cover changes in the source region.