LUCC Research In Headstream Reigon Of Yellow River Based On NOAA-AVHRR Data

As the cradle of the Yellow River, headstream region of the Yellow River was dramatically influenced by global warming as well as intensified human disturbances. Thus, the land cover type of the headstream region has changed rapidly. A series of eco-environmental problems have broken out, like glacial retreating, frozen earth melting, grassland deteriorating, loam degrading, water loss and soil erosion, plus the frequent blinding of the upriver region, all of which seriously retard the economical development of the whole Yellow River drainage. This research employed RS and GIS as platforms, combined with wild investigation and bibliography study, incipiently analyzed and appraised the land use/land cover change from 1990 to 2000 in headstream region of the Yellow river. Then we analyzed the driving forces of these land use/land cover changes. At last, some appropriate protecting methods were advanced. All these researches can provide some scientific theories for sustainable utilization of the land in the headstream region of the Yellow River. Main conclusions are listed below:(1) The types of land cover in the headstream region of the Yellow River dramatically changed within 11 years, namely from 1990 through 2000. The changes are characterized by large-area degradation of grassland, sharply decrease of the average regional vegetation cover rate, dramatically increase of the barren land's area, all of which indicating the continually deterioration of the eco-environment in the headstream region of the Yellow River;(2) Accompanied by the global warming trend, the temperature of the headstream region of the Yellow River having changed continually. Both the annually average temperature and the annually maximum temperature have risen sharply. Annually minimum temperature has also slowly increased. Nevertheless, the annually average precipitation has decreased with the trend of fluctuation;(3) Through analysis on the reason of the land use and land cover change, we getto know that: natural warm and dry weather, namely, rise of temperature, decrease of precipitation and human productive and economical activities are the institutional driving forces, moreover, the concomitant mouse and bug disasters intensified the barren trend.(4) The application built upon 1 km-scale image on the land cover change in the headstream region of the Yellow River indicates that NOAA-AVHRR have bright future on research in middle-scale geographical problems, and it can also facilitate the research on middle-scale spatial problems.(5) Research on the sustainable utilization of land in headstream region must be firstly based on guaranteeing the herdsmen's income, and then combined with the endemic practice. "Only incorporating land resources protection into development" can be the only correct way, namely, pursuing economic benefits under correct protection and utilization of land resource;whereas maintaining the protection of resources and environments with the benefit from economic development. Carrying out combined models which incorporating protection, fathering, amelioration and development all together.