Spatio-temporal differentiation in water resource vulnerability of Impatiens hainanensis,a limestone-endemic plant habitat based on grid scale
The frequent alternation between wet and dry season significant moisture pulsation in tropical rainforest karst landscapes,the zonal background environment is strongly fragile and heterogeneous.The study of the water vulnerability characteristics of local plant habitats helps to understand their adaptation mechanisms to tropical rainforest karst habitats and provides a theoretical basis for ecological restoration of plants and conservation of germplasm resources.Based on the natural environment raster data of the limestone-endemic plant Impatiens hainanensis on Hainan Island as a basis,RS and GIS techniques were used to construct a water resources vulnerability evaluation index system,combined with the integrated index method to analyze the spatial and temporal variability of water resources in I.hainanensis habitats.The results are as follows.The vulnerability of water resources in I.hainanensis habitats was dominated by natural vulnerability from 2003 to 2018,and changes in natural vulnerability fluctuations were closely related to natural factors such as precipitation.The proportion of extremely vulnerable and severely vulnerable areas was large;the proportion of moderately vulnerable and mildly vulnerable areas was small.The karst area where I.hainanensis habitats were located was in the high value of water resources vulnerability,which ranged from 0.6612-0.7532 based on the composite index method and 0.6624-1 based on GIS and RS.The water resources vulnerability of I.hainanensis habitats was influenced by the moisture characteristics of tropical rainforest karst landscapes in the dry and wet seasons,and the degree of regional differentiation was obvious.The changes in their moisture characteristics can be used to control soil erosion promptly and protect the ecological environment and germplasm resources of I.hainanensis habitats.
karstwater vulnerabilitycomposite index methodGISImpatiens hainanensis habitat
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