Impacts of vegetation change on contribution of recycled moisture to precipitation on the Loess Plateau

IF 6.3 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2025-09-02 DOI:10.1016/j.jhydrol.2025.134204

Furong Zhang, Jineng Sun, Mengqing Wang, Zhi Li

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引用次数: 0

Abstract

Clarifying the impacts of vegetation change on recycled moisture and precipitation is essential for understanding the land–atmosphere feedback and managing regional water resources. The objective of this study is to investigate the effects of transitioning from shallow-rooted crops (maize) to deep-rooted apple trees (18 and 26 years old) on the moisture recycling and local precipitation in the loess-covered region. After determining the time series of the δ²H and δ¹⁸O of advection, evaporation, and transpiration moisture, we quantified the contribution of recycled moisture to precipitation for different vegetation types based on the three-component mixing model and interpreted how vegetation change influence moisture recycling. The results indicated that 21 ± 10 % of precipitation was sourced from recycled moisture, the transpiration and evaporation contributed 13 ± 6 % and 8 ± 4 % to precipitation, respectively. Compared to farmland, the recycled moisture flux in apple orchards increased by 5 % to 10 %, with the moisture flux of transpiration increased by 18 % to 27 %, while the evaporation decreased by 11 %. The seasonal variation of moisture recycling ratio could be attributed to the positive impact of temperature and the negative impact of relative humidity. We conclude that transpiration moisture was the main source of recycled moisture, and the transition from shallow- into deep-rooted plants significantly increased the contribution of recycled moisture. The findings help to deeply understand land–atmosphere hydrological cycle processes on the Loess Plateau.

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黄土高原植被变化对再循环水分对降水贡献的影响

明确植被变化对循环水分和降水的影响，对于理解陆-气反馈和区域水资源管理具有重要意义。本研究旨在探讨浅根作物（玉米）向深根苹果（18和26年生）过渡对黄土覆盖区水分循环和局地降水的影响。在确定平流、蒸发和蒸腾水分δ2H和δ18O时间序列的基础上，基于三分量混合模型量化了不同植被类型下再循环水分对降水的贡献，并解释了植被变化对水分再循环的影响。结果表明：循环水分占降水总量的21±10%，蒸腾和蒸发对降水的贡献分别为13±6%和8±4%。与农田相比，苹果园的循环水分通量增加了5% ~ 10%，蒸腾水分通量增加了18% ~ 27%，而蒸发量减少了11%。水分再循环率的季节变化可归因于温度的正影响和相对湿度的负影响。蒸腾水分是再循环水分的主要来源，由浅根植物向深根植物的过渡显著增加了再循环水分的贡献。研究结果有助于深入了解黄土高原陆地-大气水文循环过程。

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.