世界自然遗产地荔波县植被覆盖时空变化研究

Temporal and Spatial Variation of Vegetation Coverage in World Natural Heritage Site Libo County

基于2000—2015年MODIS NDVI数据,在GIS技术支持下,采用最大值合成法、趋势分析和变异系数等方法,研究了世界自然遗产保护区荔波县植被覆盖的时空变化特征。结果表明:荔波县植被覆盖较好的区域主要分布在东部和西部区域,城镇及交通线沿线的植被覆盖较差。研究期间植被覆盖总体呈上升趋势,其中2000—2006年间植被覆盖变化比较缓慢,2006—2012年间植被上升趋势最显著,2013—2015年间植被上升趋势变缓。研究区植被覆盖变化空间差异性显著,自然保护区的植被覆盖较好,植被覆盖比较稳定;南部区域的植被退化应该引起重视。

Based on MODIS NDVI data from 2000 to 2015,using the maximum synthesis,trend analysis and variation coefficient methods,the spati-d and temporal change of vegetation cover in the world natural heritage site Libo County were studied under the GIS support. The results showed that the vegetation coverage in Libo County was mainly distributed in the eastern and western regions,and the vegetation coverage along the urban and transportation lines was poor. The vegetation coverage generally showed a rising trend during the study period. The rising trend was significant from 2006 to 2012,and relatively slow from 2000 to 2006,and slower from 2013 to 2015. The spatial variation of vegetation coverage was significant in the study area,and the vegetation coverage was good aud relatively stable in the nature reserves. It should be paid more attention to the vegetation degradation in the southern region.