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Volume 40 Issue 4
Aug.  2021
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Article Navigation >  CARSOLOGICA SINICA  > 2021  >  40(4): 661-670
ZHU Danni, ZOU Shengzhang, ZHOU Changsong, ZHAO Yi, LU Haiping, XIE Hao. Dynamic characteristics of water Level and hydro-ecological effects in Huixian karst wetland in Guilin[J]. CARSOLOGICA SINICA, 2021, 40(4): 661-670.
Citation: ZHU Danni, ZOU Shengzhang, ZHOU Changsong, ZHAO Yi, LU Haiping, XIE Hao. Dynamic characteristics of water Level and hydro-ecological effects in Huixian karst wetland in Guilin[J]. CARSOLOGICA SINICA, 2021, 40(4): 661-670.
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Dynamic characteristics of water Level and hydro-ecological effects in Huixian karst wetland in Guilin

  • Institute of Karst Geology， Chinese Academy of Geological Sciences/ Key Laboratory of Karst Dynamics， Ministry of National Resources

  • Publish Date: 2021-08-25
    Abstract
  • Huixian wetland is the largest karst wetland in China， which has important ecological and environmental functions. In recent years， the wetland has been shrinking and degrading significantly， and the ecological environment has gradually deteriorated. From the perspective of the hydrological process of wetland， based on the field fixed-point monitoring data， the seasonal water level distribution characteristics and its response to precipitation in Huixian Wetland were studied by statistical method. The conversion relationship between groundwater and surface water in wetland was analyzed， and the impact of fluctuation of wetland water level on ecological environment was further discussed. The results showed that the surface and groundwater levels of Huixian Wetland had significant spatial differences. Both of them responded rapidly to precipitation， and had significant multi-peak and multi-valley characteristics. The surface water level in the middle part of wetland was more stable than that in the marginal area， and the surface water areas in each area were connected with each other. The variation of groundwater level was affected by the topography， precipitation， karst development and Quaternary thickness， which showed similar characteristics to surface water， but the variation of water level gradually decreased from self-recharge to drainage area. Surface water and groundwater were closely related. Groundwater was an important recharge source for Huixian Wetland， which supplied surface water with a stable intensity all the year round. Pearson correlation analysis showed that there was a significant negative correlation between surface water level and water conductivity （R=-0.7808）. The increase of nutrient concentration during the decline of water level may induce eutrophication of water body. However， the correlation between groundwater level and shallow soil water content was not significant， and the disturbance to wetland habitat was small.

     

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