The Monitoring And Evaluation Of Ecological Environment Quality Of Ordos Based On GIS

Natural resources are developed and utilized unreasonable, industrial waste emissions are discharged that is one of the environmental problems. Ordos city, the main part of Loess Plateau, situated in the north-west of Inner Mongolia that is the region with temperate continental climate, vulnerable ecological environment, space-time location of the precipitation is not well balanced, soil and water loss and desertification seriously. It is one of the most important problems that environmental problems were caused by unfriendly activities and natural factors together in Ordos city.In this paper, taking Ordos city as a sample region, all the factors which are related to environmental problems, for example, remote sensing image (TM/ETM), annual precipitation, quantity of pollutant discharged and water resources, are analyzed. Different indexes including BAI, NDVI, WDI, LDI and PLI are calculated using ENVI and GIS. Based on evaluation methodology of composite index, eco-environmental status is evaluated and LUCC and eco-environmental is dynamic monitored in Ordos city in 2000, 2005, 2007.The result shows that eco-environmental status worse gradually from the centre to two sides of north and south. There are more biological specimen, vegetative cover, water resources, land degradation in Dongsheng, Yijinhuoluo, Etuoke and Zhunge'e than Hangjin, Dalate, Etuokeqian and Wushen, especial Hangjin, but the character is reverse in pollution extent.Forest land, grassland, waters, cultivated land, urban land, village land, building land and EQI keeps increase tendency and EQ is better and better, but uncultivated land keeps decrease tendency for the period from 2000 to 2007. Forest land, grassland, waters, urban land, village land and building land keeps increase tendency and EQ is better and better, but EQI keeps on and cultivated land and uncultivated land keeps decrease tendency for the period from 2000 to 2005. About EQI, keeps on significantly decreased tendency in Dalate and Yijinhuoluo, in Etuoke, Etuokeqian and Wushen, too, but not obviously; while significantly increased tendency in Dongsheng and Zhunge'e, in Hangjin, too, but not obviously these time. Grassland, waters, cultivated land, urban land and village land keeps increase tendency, but Forest land, uncultivated land, building land keeps decrease tendency for the period from 2000 to 2007. Although EQI keeps on in Ordos, keeps increase tendency in total in every research unit. All the characters are shown based on analysis of land type and ecological-environment changes in Ordos...