基于GIS的重庆市涪陵区地被指数分析评价

Analysis and Evaluation of Land Cover Indices in Fuling District of Chongqing City Based on GIS

在1999-2017年逐旬的植被指数(NDVI)和涪陵区1∶1万土地利用现状数据(2017年)的基础上,参考《中华人民共和国环境保护行业标准:生态环境状况评价技术规范》中的植被覆盖度指数模型,结合研究区域实际情况,构建了地被指数模型;并借助GIS技术,对重庆市涪陵区的地被指数进行计算分析,得到涪陵区地被指数的空间分布成果。研究结果表明:①从整体上看,涪陵区的地被指数呈从长江和乌江沿岸向四周逐渐增高的趋势;②涪陵区地被指数最高的区域位于东南部的武陵山一带,最低值位于长江、乌江一带;③涪陵区地被指数低值区域与各场镇的空间位置具有较好的空间耦合性,说明人类建设活动对涪陵区地被指数的影响较大。

Based on the vegetation index(NDVI) from 1999 to 2017 and Fuling 1∶10 000 land use status data(2017), referencing the vegetation coverage index model in the People’s Republic of China Industrial Standard: the Technical Specification for Ecological Environment Evaluation, combining with the practical situation of the study area, we built a land cover index model. Then, we used GIS technology to calculate the land indices in Fuling District, and got the spatial distribution results of land cover indices in Fuling District. The results show that(1) as a whole, the land cover index in Fuling District shows a gradually increasing trend from the Yangtze River and Wujiang River to the surrounding.(2) The region with the highest land cover index in Fuling District is located in Wuling mountain in the southeast, and the lowest value is located in the Yangtze River and Wujiang River.(3) The low value of land cover index in Fuling District and the spatial location of each field town show a good spatial coupling, indicating that human construction activities have a great impact on the land cover indices in Fuling District.