Study On Dynamic Monitoring Of Desertification And Land Production Evaluation On The Interlaced Area Of Agriculture And Pasture In Northern Shaanxi

It is a problem that affects the economy of interlaced area of agriculture and pasture in northern Shaanxi that fragile ecosystem, weak economy foundation, and short food supply. The increase in population and then land pressure caused land desertification, this zone had changed into main source place of dust storm. Therefore, the land use/cover and desertification change of this zone in the past 15 years had been investigated through three sets of remote sensing data of TM acquired in August, 1986, July, 1992 and July, 1994, and August, October, 1999 and August, 2002 and August, 2000. Based on the RS and GIS, research attempted to monitor the land use/cover and desertification process and spatial heterogeneity dynamic change, work out the driving mechanism from 1986 to 2000 in this region. The spatial database was built, and then land quality evaluation based on the software—Arc GIS; the land ultimate production potentiality and carrying capacity were estimated; forecasts the land production level and suitable carrying capacity in 2005, 2015, and 2030 according to the population development and consumption standard by using 50 year's historical data. The results show that:1. From 1986 to 2000, the total area of crop land was decreasing 3599.29km2, which was caused by rain fed land decreasing mainly, the decreasing area had mainly converted to wasteland, salina land and sand land. The area of forest land and grassland have increased 1320.74km2 and 785.90km2 respectively, the increasing area come from crop land and sand land, that was the result of returning cropland to grassland or woodland and sand land rehabilitated. With the rapid development of city base and economic of the study area, the scale of urban and country area had highly enlarged 195.19km2 from 1986 to 2000, which expanded outward based on the primary city. The body of water had hardly changed through monitoring, but the river showed shrinking by 69.80km2 in the past nearly 15 years, on the contrary, beach and reservoir area with the great augment, each increased by 99.67km2 and 9.80km2 from 1986 to 2000. The large scale of rainfed land became salina land, which brought about the increasing of its areas sharply. In particularly, during the beginning to...