Global rainfall partitioning by dryland vegetation: developing general empirical models
Global rainfall partitioning by dryland vegetation: developing general empirical models
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DOI：
10.1016/j.jhydrol.2022.127540
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发表时间：
2022-01
影响因子：
6.4
通讯作者：
Patricio N. Magliano;J. I. Whitworth‐Hulse;F. D. Cid;J. Leporati;John T. Van Stan;E. Jobbágy
中科院分区：
文献类型：
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作者：
Patricio N. Magliano;J. I. Whitworth‐Hulse;F. D. Cid;J. Leporati;John T. Van Stan;E. Jobbágy
植物冠层对降雨的分配可通过改变土壤所获水量、时间和模式，在旱地生态水文学中发挥关键作用。在这里，我们综合了来自40个旱地站点的2，297次降雨事件的拦截，穿透和茎流观测，其中包括48种植物。然后，我们开发了一般的经验模型，能够预测响应的降雨分割成拦截，穿透和树干径流作为降雨事件的大小考虑不同的功能因子（生活型，树皮类型）的函数。12个线性模型解释了所有合成观测的显著变异性。在所有的情况下，截留，穿透和树干流量线性增加的降雨事件的大小的函数的斜率范围为0.149-0.174毫米的截留每毫米降雨，0.776-0.829毫米的穿透每毫米降雨，和0.026-0.063毫米的树干流量每毫米降雨。一方面，灌木和粗皮树种的截留量分别大于乔木和光皮树种;另一方面，灌木和光滑树皮的物种比树木和粗糙树皮的物种，分别呈现较少的穿透雨。最后，灌木和光滑树皮的物种比树木和粗糙树皮的物种，分别呈现更多的树干茎流。我们的模型证实了迄今为止通过其他全球荟萃分析发现的科学证据，但也使我们能够探索不同情景下的降雨分区。我们的研究结果有助于在植被覆盖和气候条件变化的背景下预测和管理水资源有限的生态系统中的生态水文变化。
Rainfall partitioning by plant canopies can play key roles in dryland ecohydrology by altering the amount, timing and patterns of water receipt to soils. Here, we synthesized interception, throughfall and stemflow observations from 2,297 rainfall events across 40 dryland sites, including 48 plant species. Then, we developed general empirical models able to predict the response of rainfall partitioning into interception, throughfall and stemflow as a function of rainfall event size considering different functional factors (life form, bark type). Twelve linear models explained significant variability across all synthesized observations. In all cases, interception, throughfall and stemflow linearly increased as a function of rainfall event size with slope ranges of 0.149–0.174 mm of interception per mm of rainfall, 0.776–0.829 mm of throughfall per mm of rainfall, and 0.026–0.063 mm of stemflow per mm of rainfall. On the one hand, shrubs and rough-barked species presented more interception than trees and smooth-barked species, respectively. On the other hand, shrubs and smooth-barked species presented less throughfall than trees and rough-barked species, respectively. Finally, shrubs and smooth-barked species presented more stemflow than trees and rough-barked species, respectively. Our models confirm the scientific evidence found so far by other globalmeta-analyses but also allow us to explore the partitioning of rainfall against different scenarios. Our findings can be useful to help to predict and manage ecohydrological change in water-limited ecosystems in the context of shifting vegetation cover and climate conditions.