基于MODIS NDVI的川中丘陵区植被覆盖度景观格局变化

Landscape pattern change of vegetation coverage in hilly area of central Sichuan,Southwest China based on MODIS NDVI

基于2000年、2005年和2010年3个时相MODIS NDVI数据,利用ArcGIS 9.3及Fragstas 3.3对川中丘陵区植被景观变化进行了研究。结果表明:10年尺度上区域植被以中高及高覆盖度为主,2000—2005年总体变化不大,2005年以来,高覆盖度面积锐减,大部分区域转换为中高覆盖;景观特征上,2005年以来斑块破碎性加剧,混杂程度提高,最大斑块指数减少为原来的28%;空间位置上,覆盖度降低的区域集中分布于交通干线、新建城区与重大工程建设用地及其周围区域;10年来川中丘陵区城镇化进程加快,城镇、交通等大规模建设用地,叠加农村撂荒问题及其他干扰因子综合影响,区域植被覆盖呈现下降趋势。

Based on the MODIS NDVI data of 2000, 2005 and 2010, and by using ArcGI5 9.3 and Fragstas 3.3, this study investigated the vegetation landscape change in hilly area of central Siehuan. At a scale of 10 years, the regional vegetation was dominated by midhigh and high coverage. Overall, from 2000 to 2005, the vegetation coverage had less change; while since 2005, the area of high vegetation coverage decreased sharply, and most of it converted to mid high vegetation coverage. In terms of landscape characteristics, the patches since 2005 had be come more fragmented and more confounding, with the largest patch index reduced to 28%. Spa tially, the areas with reduced vegetation coverage concentrated in traffic trunk lines, new cities, large project construction lands and their surrounding areas. In the past 10 years, due to the effects of accelerated urbanization, massively increased towns and transportation construction lands, superimposed rural land abandonment, and other interference factors, the vegetation cov erage in the hilly area of central Sichuan presented a decreasing trend.