喀什市城市植被及其覆盖度研究

Study on urban vegetation and its coverage in Kashgar city

针对国内外对城市植被及其覆盖度方面的研究不够深入的现状,该文以喀什市1990年、2000年及2010年3期Landsat TM/ETM+遥感影像为数据源,结合归一化植被指数(NDVI)与植被覆盖度估算方法,对喀什市植被覆盖区土地类型、面积变化等方面进行研究。结果表明:1990年至2010年,高覆盖区所占比例由1990年到2000年逐步增加,2010年稍有减少;中高覆盖区面积出现先减小后增加的变化趋势;中覆盖区面积逐年增加;低覆盖区呈先减小后增加的趋势;极低覆盖区变化最慢,2010年比1990年稍有增加。

Aiming at the insufficiency of the study on urban vegetation and its coverage, the paper took the Landsat TM/ETM＋ remote sensing data of Kashgar city in 1990, 2000 and 2010 as data source, combining with NDVI and vegetation coverage estimation methods, studied the urban vegetation dynamic changes of Kashgar of past 20 years. Result showed that from 1990 to 2010, the percentage of the high coverage area gradually increased from 1990 to 2000, and there was a slight decrease in 2010; the moderate and high coverage area showed the trends of decrease firstly and then increase; the moderate coverage area increased gradually year by year; the low coverage area showed the trend of decrease firstly and then increase; and the percentage of very low coverage area changed the slowest, while increased slightly in 2010, compared to the percentage of 1990.