退耕还林对三峡库区亚热带丘陵土壤优先流发生的影响

IF 5 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-05-19 DOI:10.1016/j.ejrh.2025.102473

Jiapan Xu , Xue Shen , Muxing Liu , Jun Zhang , Qian Yang , Jun Yi , Shenglong Li , Chongfa Cai

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引用次数: 0

摘要

研究区域——三峡库区土壤优先流（PF）是一种特殊而重要的入渗模式。然而，对土地利用转换后PF发生变化的理解尚不清楚，特别是在亚热带丘陵和山区，在经济利益的驱动下，大片森林被砍伐用于种植茶叶。从2022 - 2024年，在不同土地利用类型（林地、FL、FL）的2个坡地上、中、下坡不同位置的5个土壤深度获取土壤水分数据。茶园（TP）。本研究调查了105个降雨事件，在此期间，土壤水分对各土层降雨的响应序列确定了PF。平均而言，FL的PF发生频率（FPF）和PF事件所占土壤储水量的比例（PSWS）分别为7.9% %和40.8% %，高于TP的7.1% %和35.4% %。此外，地形位置也影响了高海拔地区和高海拔地区PF发生率的差异。在坡中位置，特别是在较深土层（即40-80 cm）， FL的FPF和PSWS均显著高于TP （p <； 0.05）。相反，在上坡和下坡位置没有观察到这种差异。这些结果表明，在TP坡地的某些地形位置，PF的发展是有限的。此外，随着土地利用类型的改变，降雨对小檗碱的影响由数量控制向持续时间控制转变，影响小檗碱发生的土壤性质种类增加。上述研究结果表明，森林采伐茶叶削弱了土壤水分的快速入渗，并改变了这一过程的控制因素，为亚热带湿润山地生态系统的土地利用和水资源管理提供了有价值的见解。

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Influence of converting forestland to tea plantation on soil preferential flow occurrence in subtropical hillslopes of Three Gorges Reservoir Area, China

Study region

Three Gorges Reservoir Area, China

Study focus

Soil preferential flow (PF) is a special but important pattern of water infiltration. However, the understanding of how the PF occurrence changes following land-use conversion remains unclear, especially in subtropical hilly and mountainous regions where large areas of forest have been cleared for tea cultivation driven by economic interests. From 2022 to 2024, soil moisture data were acquired from five soil depths across various positions (upslope, mid-slope, and downslope) on two hillslopes with different land-use types (forestland, FL; tea plantation, TP).

New hydrological insights for the region

This study investigated 105 rainfall events, during which PF was identified by soil moisture response sequence to rainfall across soil layers. On average, the frequency of PF occurrences (F_PF) and proportion of soil water storage from PF events (P_SWS) for FL were 7.9 % and 40.8 %, respectively, higher than those for TP, which were 7.1 % and 35.4 %. Besides, the difference in PF occurrence between FL and TP was affected by topographic position. At the mid-slope location, particularly in deeper soil layers (i.e., 40–80 cm), both F_PF and P_SWS in FL were significantly (p < 0.05) higher than those in TP. Conversely, no such differences were observed at the upslope or downslope location. These results reveal the limited development of PF at certain topographic positions in TP hillslope. Moreover, following the land-use conversion, the influence of rainfall on PF transitioned from quantity control to duration control, and the variety of soil properties affecting PF occurrence increased. These findings indicate that the deforestation for tea cultivation has weakened the rapid infiltration of soil water and altered the controlling factors over this process, which can provide valuable insights for land-use and water resource management in subtropical humid mountainous ecosystems.

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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.