黄河上游植被变化对水分有效性的影响

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-04-22 DOI:10.1016/j.ejrh.2025.102403

Yan Wang , Guoqing Wang , Xiyuan Deng , Yuli Ruan , Cuishan Liu

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引用次数: 0

摘要

研究区域中国黄河上游流域（UYRB）研究重点植被变化对陆地水和能量通量的影响已引起全球关注，但其对水供应的影响仍不确定。在这项研究中，我们结合长期卫星数据和生态水文模型，探讨了植被变化如何影响长江上游地区不同气候条件和植被类型下的水文过程和可用水量，该地区是长江上游地区最重要的水源保护区。该地区的新水文见解从 1982 年到 2018 年，乌裕拉山地区的植被呈现出以绿化为主的趋势，57.9% 的区域呈现出显著的绿化，导致蒸散量（ET）增加、径流减少、土壤条件更加干燥、产水量和陆地蓄水量变化（TWSC）下降。根据使用卫星得出的动态叶面积指数（LAI）进行的模拟，我们进一步估计，LAI 的单位变化导致水分产量和陆地储水量变化分别为 -124.15 ± 71.38 mm yr-1 和 -102.21 ± 74.98 mm yr-1。然而，使用模型预测的 LAI 进行的模拟低估了这一控制，这可能是由于 LAI 动态表现不佳。气候条件和植被类型对 LAI 的影响有明显的调节作用，植被绿化加剧了干旱地区的缺水状况。

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Assessing the impact of vegetation changes on water availability in the upper Yellow River Basin, China

Study region

The upper Yellow River Basin (UYRB), China

Study focus

The influences of vegetation changes on terrestrial water and energy fluxes have attracted global attention, yet the effect on water availability remains uncertain. In this work, we combined long-term satellite data and ecohydrological modeling to explore how vegetation changes affect hydrological processes and water availability across different climatic conditions and vegetation types in the UYRB, the most important water conservation area within the YRB. The Community Land Model version 4.5 (CLM4.5), coupled with the Variable Infiltration Capacity (VIC) parameterizations, was utilized for ecohydrological applications.

New hydrological insights for the region

From 1982 to 2018, vegetation in the UYRB exhibited a predominantly greening trend, with 57.9 % of the area showing significant greening, resulting in increased evapotranspiration (ET), diminished runoff, drier soil conditions, and decline in water yield and terrestrial water storage change (TWSC). According to the simulation using the satellite-derived dynamic leaf area index (LAI), we further estimated that a unit change in LAI resulted in changes in water yield and TWSC of −124.15 ± 71.38 mm yr⁻¹ and −102.21 ± 74.98 mm yr⁻¹, respectively. However, the simulation with model-predicted LAI underestimated this control, likely due to the poor representation of LAI dynamics. The LAI effects were significantly modulated by climatic conditions and vegetation types, with the greening of vegetation exacerbating water scarcity in arid regions.

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.