Vegetation cover-another dominant factor in determining global water resources in forested regions
Vegetation cover-another dominant factor in determining global water resources in forested regions
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植被覆盖——决定全球森林地区水资源的另一个主导因素
DOI：
10.1111/gcb.13983
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发表时间：
2018
影响因子：
11.6
通讯作者：
Liu Shirong
中科院分区：
文献类型：
--
作者：
Wei Xiaohua;Li Qiang;Zhang Mingfang;Giles-Hansen Krysta;Liu Wenfei;Fan Houbao;Wang Yi;Zhou Guoyi;Piao Shilong;Liu Shirong
森林集水区提供极其重要的水资源。由于过去几十年全球森林变化剧烈，政府间气候变化专门委员会（IPCC）高度认识到将森林或植被变化纳入气候变化下水资源评估的重要性；然而，这一重要性尚未在全球范围内得到定量检验。在这里，我们使用四个基于遥感的指数来表示森林为主地区植被覆盖的变化，然后将它们应用到广泛使用的模型：Fuh模型和Choudhury-Yang模型中，以评估植被和气候变化对2000年至2011年全球森林景观（森林覆盖率>30%）年径流变化的相对贡献。我们的模拟显示，植被覆盖变化导致的全球年径流平均变化为 30.7% ± 22.5%，其余归因于气候变化。由于更大的森林损失，热带和北方森林中的植被变化导致年径流变化较大。我们的模拟还证明了植被覆盖和气候在决定水资源变化方面的抵消和相加效应。我们的结论是，植被覆盖变化必须纳入任何评估气候变化下森林主导地区全球水资源变化的全球模型中。
Forested catchments provide critically important water resources. Due to dramatic global forest change over the past decades, the importance of including forest or vegetation change in the assessment of water resources under climate change has been highly recognized by Intergovernmental Panel on Climate Change (IPCC); however, this importance has not yet been examined quantitatively across the globe. Here, we used four remote sensing‐based indices to represent changes in vegetation cover in forest‐dominated regions, and then applied them to widely used models: the Fuh model and the Choudhury‐Yang model to assess relative contributions of vegetation and climate change to annual runoff variations from 2000 to 2011 in forested landscape (forest coverage >30%) across the globe. Our simulations show that the global average variation in annual runoff due to change in vegetation cover is 30.7% ± 22.5% with the rest attributed to climate change. Large annual runoff variation in response to vegetation change is found in tropical and boreal forests due to greater forest losses. Our simulations also demonstrate both offsetting and additive effects of vegetation cover and climate in determining water resource change. We conclude that vegetation cover change must be included in any global models for assessing global water resource change under climate change in forest‐dominant areas.