Woody Plant Encroachment has a Larger Impact than Climate Change on Dryland Water Budgets
Woody Plant Encroachment has a Larger Impact than Climate Change on Dryland Water Budgets
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DOI：
10.1038/s41598-020-65094-x
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发表时间：
2019-12
影响因子：
4.6
通讯作者：
A. Schreiner‐McGraw;E. Vivoni;H. Ajami;O. Sala;H. Throop;D. Peters
中科院分区：
文献类型：
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作者：
A. Schreiner‐McGraw;E. Vivoni;H. Ajami;O. Sala;H. Throop;D. Peters
木本植物侵入草原是一种全球性现象，与干旱化造成的土地退化有关，干旱化用灌木和裸露的土壤斑块取代草地。目前仍不确定全球水资源消耗和气候变化进程如何联合收割机影响生态系统的水资源供应。使用基于过程的模型约束流域观测，我们的研究结果表明，干旱化和气候变化增加通道传输损失的植物可用水的费用增加地下水补给。然而，从草地到灌木地的转换不会产生额外的裸露土壤，减少了传输损失。考虑WPE和气候变化的模式模拟被用来评估它们在21世纪后期的条件下的相对作用。结果表明，在集中通道补给的变化主要是由WPE途径。因此，在评估地下水含水层对气候变化的脆弱性时，应考虑到水环境效应。
Woody plant encroachment (WPE) into grasslands is a global phenomenon that is associated with land degradation via xerification, which replaces grasses with shrubs and bare soil patches. It remains uncertain how the global processes of WPE and climate change may combine to impact water availability for ecosystems. Using a process-based model constrained by watershed observations, our results suggest that both xerification and climate change augment groundwater recharge by increasing channel transmission losses at the expense of plant available water. Conversion from grasslands to shrublands without creating additional bare soil, however, reduces transmission losses. Model simulations considering both WPE and climate change are used to assess their relative roles in a late 21stcentury condition. Results indicate that changes in focused channel recharge are determined primarily by the WPE pathway. As a result, WPE should be given consideration when assessing the vulnerability of groundwater aquifers to climate change.