In Karst drainage
basins, there are the ground water and underground water exchanging frequently,
and the shortage of water resources due to having the special double aquifer
mediums and unique surface and subsurface river systematic structure. This
paper is to select 20 research sampling areas coming fromGuizhouProvince,
and according to the spectral characteristics of the
catchment water-holding mediums and vegetations, and using the remote sensing
technique, extract the watershed vegetation index. According to the principle
of principal component analysis, using the software of Spss and Matlab is to
analyze the impacts of watershed vegetation type on the catchment water-holding
ability, and establish the principal component analysis function. Studies have
shown that: 1) the watershed vegetation coverage rate plays an important role in Karst
basin water-holding ability; 2)the catchment
water-holding ability is the comprehensive reflection and manifestation of the
Catchment Water-storing Capacity (CWC); 3)it is much better effects and higher accuracy to
monitor/forecast the catchment water-holding volume by using the vegetation
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