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Chinese Journal of Applied Ecology ›› 2024, Vol. 35 ›› Issue (2): 407-414.doi: 10.13287/j.1001-9332.202402.020

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Water conservation pattern of Fangcheng River Basin in Beibu Gulf and its response to precipitation

GAN Wenjing1, MO Shangxuan1, ZHANG Jianhong2, SONG Xianwei1*, XIAN Jinmei1, YANG Lu1, NONG Haiqin1   

  1. 1Guangxi Key Laboratory of Forest Ecology and Conservation, Guangxi Colleges and Universities Key Laboratory for Cultivation and Utilization of Subtropical Forest Plantation, College of Forestry, Guangxi University, Nanning 530004, China;
    2Hydrological Center of Guangxi Zhuang Autonomous Region, Nanning 530023, China
  • Received:2023-06-02 Revised:2023-12-06 Online:2024-02-18 Published:2024-08-18

Abstract: Assessing the spatiotemporal patterns of watershed water conservation under the influence of the South Asian monsoon climate and its response to precipitation is essential for revealing the evolving patterns of water conservation under different temporal scales. Following the principles of water balance and using the Soil and Water Assessment Tool (SWAT) model, we investigated the spatiotemporal patterns of water conservation and its response to precipitation in the Fangcheng River Basin of Beibu Gulf. The results showed that water conservation in Fangcheng River Basin calculated by SWAT model were 1637.4 mm·a-1, accounting for 50.7% of the mean annual precipitation. The variation of water conservation in different sub-basins was obviously different. Sub-basins with high forest coverage and steep slopes exhibited higher water conservation, while sub-basins with other land use types (such as cropland and grassland), gentle slopes, and intense human activities showed lower water conservation. At the monthly scale, both water conservation and its variation showed similar response characteristics to precipitation in the basin. The response of water conservation variation to sub-precipitation events could be classified into two types. For the short-term rainfall events (duration≤2 days), water conservation variation showed a linear relationship. For the medium to long-term rainfall events (2 days<duration≤10 days), water conservation variation showed a nonlinear curve, being influenced mainly by processes such as evapotranspiration. High-frequency short-duration precipitation events were more conducive to increasing ecosystem water conservation compared to the long-duration precipitation events.

Key words: water conservation, SWAT model, spatio-temporal pattern, precipitation, hydrological simulation