【摘要】 针对乌鲁木齐市建成区扩张及其内部生态环境发生变化的问题,该文选取1993年、2003年和2013年的DM_SP/OLS夜间灯光数据、2018年的NPP-VIIRS夜间灯光数据以及Landsat影像,利用二分法、归一化植被指数分析等方法,研究乌鲁木齐市建成区扩张及其植被状况的时空演变特征。结果表明:乌鲁木齐市建成区呈现"T"型扩张的同时也向北延伸,其扩张速度和动态度分别为40.28km~2/a、23.98%,均属于高速扩张类型。乌鲁木齐市建成区重心在1993—2003年向西转移了1 577.60m;2003—2013年向西北方向转移了2 584.54m;2013—2018年向东北方向转移了1 232.59m。建成区内的植被呈现先升高后急剧降低的趋势,由1993年的419.70下降到2018年的-18.20,且NDVI均值变化量为负值,说明该建成区内的植被状况在逐渐变差。更多还原

【Abstract】 Aiming at the problem that the expansion of the built-up area of Urumqi and the changes in its internal ecological environment,DM_SP/OLS nighttime lighting data and Landsat images for 1993,2003 and 2013,and NPP-VIIRS nighttime lighting data for 2018 were selected with the method of dichotomy,normalized difference vegetation index analysis and other methods to do research on the expansion of built-up areas in Urumqi and its spatial-temporal evolution characteristics of vegetation.The results showed that the built-up area of Urumqi showed a"T"type expansion and it also extended to the north,the expansion rate and dynamics were 40.28 km~2/a and 23.98%,and both of high-speed expansion types,Urumqi built-up area shifted its center of gravity to the west by 1 577.60 min 1993—2003;in2003—2013,it was transferred to the northwest 2 584.54 m;in 2013—2018,it was transferred northeast for 1 232.59 m.The vegetation in the built-up area showed a tendency of decreasing after increasing firstly,1993—2018,the vegetation in the built-up area decreased from 419.70 to-18.20,and the mean change of NDVI was negative,it indicated that the vegetation conditions in the built-up area were gradually deteriorating.更多还原