Separation Of The Dominant Factors Working On The Regional Ecological Environment Evolvement And Their Intension On The Enviroment

The source regions of Yangtze River, Yellow River and Lantsang River lies in the east longitude 89°24′～102°41′, north latitude 31°39′～36°16′, located in the hinterland of the Qinghai-Tibet Plateau and the principal part of the Qinghai-Tibet Plateau, which is could be divided into the region of Yangtze River and Lantsang River and the region of Yellow River according to their area and topography, area of both parts covers for 194578 km2 and 123612 km2 respectively. It is the main water source area of our National Rivers and the International River, Yangtze River in the area of water supply which amounted to 25%, the Yellow River reached 49%, up to 15% Lantsang River. Due to the influence of the natural factors and the human activities, the ecosystem structure and function is being significantly deteriorated, and impact of the hydrological system, grass ecosystems, glaciers permafrost ecosystems and biodiversity, which has a seriously effect on the sustainable socio-economic development, water resources and ecological security in the Yellow River area and the middle and upper reaches of the Yangtze River area. Therefore, analyzing the mechanisms of the ecological environment evolution drawn by the natural factors and human factors in the area, determining the dominant factors working on the environmental evolution, by the establishment of mathematical models, separating the influence of the natural factors and human factors on the ecological environment evolution, which is provided the theoretical basis and the scientific method to scientific assessment of the human factors and natural factors on the evolution of the ecological environment in this area, and correct understanding the regional ecological environment evolution of the role of mechanisms.Since the selection of doctor papers subjects in 2002, I have visited the Hainan state, Huangnan state, Yushu states, Guoluo state, the region of Qinghai lake, the Qinghai-Tibet Highway and Qinghai-Tibet railway, and other places during her visits in August 2002, July 2003, August 2004 and August 2005 respectively, and making detailed investigation the livestock, agriculture, population, religious civilization, such as socio-economic development in Maduo, Qumalai, Yushu and Angqian, surveying the hydrology, grasslands ecosystems,...