Research On The Spatial-Temporal Pattern And Driving Factors Of Ecological Carrying Capacity In Longdong Region

Ecological Carrying Capacity (ECC) is the base of region sustainable development. As a typical region of Jinghe Basin in the heart of Loess Plateau LongDong is the important area of economic development in Gansu. With poor natural environment, serious damage to vegetation, the study area is the most serious soil erosion and ecological imbalance region in Yellow River middle reaches. While urban expansion, mining and other human activities in recent years, the ecological problem of LongDong is further exacerbated. Therefore, scientific evaluation of the ecological carrying capacity is meaningful to improve the ecological environment of Longdong.For the moment, most of the ecological carrying capacity estimates are based on Statistical Yearbook and statistical data of land use, assessment of regional ecological carrying capacity combined with land use has less involved. With the help of RS-GIS technologies, this essay studyed four times of land Use/land Cover and ecological carrying capacity through the ecological footprint method, realized the space of regional ecological carrying capacity, and made up for the deficiencies of traditional methods. Meanwhile, the essay did further study on the driving factors of the ecological carrying capacity. The results show in the following:(1) Most of the land of Longdong are arable and grassland.1986-2008, all of the land have occurred changes, the net variation of transfer area are concentrated on arable, grassland and woodland. Transfer trends of land use:arable turn into forest and grassland, water and land for urban and rural residents mainly turn into arable.(2) The total regional and per capital ecological carrying capacity all decreased. Through three scales study, the paper indicated that the supply of ecological carrying capacity is uneven distribution in space, the relationship between ecological carrying capacity and land use and land productivity is high correlated. The total ecological carrying capacity is different among various counties.The per capital and per unit area ecological carrying capacity shows the level and zonal distribution pattern in space. (3) The distribution and transfer of the ecological carrying capacity in study region is subjected to the interaction of natural and socio-economic environment. The precipitation which is positively correlated with the total ecological carrying capacity is the dominant factor of natural environment. In addition, it is inverse correlated between the population density and industry density and the ecological carrying capacity. These factors on the impact of land use to enhance or reduce ecological productivity, thereby affect the ecological carrying capacity.