1995—2015年厦门市土地利用变化对植被覆盖度的影响

以厦门市1995、2005、2015年Landsat遥感影像为数据源,利用太阳光谱卫星信号的二次模拟(6S)模型进行大气校正并计算地表反射率,在ENVI5.2软件支持下获取3期的归一化植被指数(NDVI)和植被覆盖度(FVC),得到厦门市1995、2005、2015年的平均FVC值分别为0.35、0.22、0.31。运用监督分类中最大似然法提取土地利用信息,利用Arc GIS10.1软件将FVC与土地利用分类图进行叠加分析,得到了厦门市1995—2015年间FVC对土地利用变化的响应。结果表明:厦门市FVC在1995—2005年间降低了37%,在2005—2015年间增加了29%;厦门市的平均FVC在水域增加17%,在建设用地增加35%,在耕地增加22%,在林地减少27%,并依此为厦门市城市发展和生态建设提供建议。

Impacts of land use change on vegetation coverage in Xiamen City from 1995 to 2015

Based on Landsat remote sensing images of Xiamen City in 1995, 2005 and 2015, atmospheric correction was performed with the second simulation of the satellite signal in the solar spectrum ( 6S) model and the surface reflectivity was calculated. With the support of ENVI 5.2, normalized difference vegetation index ( NDVI) and fractional vegetation cover ( FVC) of 3 years were obtained, and the average FVC of Xiamen City in 1995, 2005 and 2015 were 0. 35, 0. 22 and 0. 31 respectively. The land use information was extracted by the maximum likelihood method, the FVC and land use classification map were overlaid by ArcGIS 10.1 software, and the response of vegetation coverage to land use change was obtained from 1995 to 2015 in Xiamen. The results showed that FVC in Xiamen decreased by 37% from 1995 to 2005 and increased by 29% from 2005 to 2015. The average FVC have an increase of 17% in water land, 35% in construction land, 22% in arable land, but 27% decrease in forestland of Xiamen City from 1995 to 2015. And thus suggestions for Xiamen City development and ecological construction was provided.