EOS/MODIS影像处理在塔里木河下游植被监测中的应用

Study on the EOS/MODIS Image Processing and Its Application in Monitoring the Vegetation Change in the Lower Reaches of the Tarim River

采用了国家卫星气象中心MODIS处理软件和ENVI(The Environment for Visualizing Images)遥感软件,针对塔里木河下游地区,利用新疆维吾尔自治区气象局存档的2002和2003年MODIS原始影像资料,计算生成NDVI(归一化植被指数)数据。在分类的基础上讨论各植被覆盖类型的季节变化特征及对生态输水的响应,结果表明,MODIS数据及其植被指数产品,可以较稳定和准确地监测和反映研究区植被覆盖的季节变化特征及对生态输水的响应。

The Green Corridor （39°25＇13＂～41°02＇36＂N, 86°32＇14＂～88°57＇12＂E, 798～982 m a. s. l.） in the lower reaches of the Tarim River is located in a southeast-northwest narrow zone between the Taklimakan Desert and the Kuruk Desert, and its terrain slopes from northwest to southeast. Mobile and semi-fixed dunes, dunechains and valleys are densely distributed along the corridor. Affected by the Taklimakan Desert, it belongs to the typical arid continental climate, which is characterized by windy weather, violent evaporation, infrequent occurrence of precipitation, high diurnal-nocturnal temperature difference, and rich sunshine. The natural forests are dominated by the trees of Populus euphratica, the shrubberies are dominated by Tarnarix sp. and Halostachys caspica, then by Lyciurn ruthenicurn, Halimodendron halimodendron, etc., and the herbages are dominated by Phragmites communis, Apocymum venetum, Glycyrrhiza inflata, Karelinia caspica, Alhagi sparsifolia, etc. In this paper, the NDVI data are derived to research the vegetation change in an investigated area of 13 308.6 km^2 in the lower reaches of the Tarim River by using the MODIS processing software invented by National Satellite Meteorology Center and the ENVI remote sensing software based on the MODIS data in 2002 and 2003, stored by Meteorological Bureau of Xinjiang Uygur Autonomous Region. After classifying, this paper analyzes the seasonal change and the response of all the vegetation types to the implementation of project of transfusing stream water for regenerating the ecology in the lower reaches of the Tarim River. The results show that the MODIS data and the vegetation indexes can be used to accurately monitor and reveal the seasonal change and the response of all the vegetation types to the implementation of project of transfusing stream water fo4r regenerating the ecology in the lower reaches of the Tarim River.