Remote sensing inversion of dissolution rate of limestone bedrock surface based on ecological parameters in Karst areas
CHEN Mengjie1,2, WU Hong1,2, LIU Chao3, ZHOU Minyue1, LU Dingge1, GUO Wei4
1. Institute of Remote Sensing Applications, School of Earth Sciences, Guilin University of Technology, Guilin 541006, China; 2. Spatial Information and Mapping Key Laboratory of Guangxi/School Surveying and Mapping, Guilin University of Technology, Guilin 541006, China; 3. Tangshan Caofeidian Area of Land and Resources Bureau, Tangshan 063000, China; 4. Central South Institute of Metallurgical Geology, Yichang 443000, China
Abstract：To explore the correlation between the ecological parameters of Karst peaks and the dissolution rate of surface limestone bedrock, the authors selected the relevant ecological parameters to indirectly estimate the dissolution rate of limestone bedrock under the soil surface and, based on TM multi-band data of Landsat5, chose Karst area of Yaji Village in Guilin as the study area for the purpose of extracting its sensing parameters comprising NDVI, ground temperature and soil moisture. Using SPSS statistical software, the authors made a correlation analysis of these three factors with the limestone dissolution rate and obtained their correlation coefficients, which are-0.91, 0.85 and 0.93 respectively. A computing remote inversion model of limestone surface dissolution amount dissolution rate, which is covered by vegetation, was established by using NDVI to perform estimatation through regression analysis. The results show that NDVI and limestone dissolution rate have the maximum correlation. Therefore, the vegetation information is an indirect sign of dissolution of limestone bedrock surface. There is a linear relationship between the dissolution rate and the NDVI index. So long as the NDVI index is known in other parts of the study area, the limestone dissolution rate in this area can be estimated.
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2015, Vol. 27 
