Study On Landscape Dynamic And Driving Forces In Typical Wind-sand Damage Area In Beijing

Desertification is one of the most serious resource and eco-environment problems in the world at present. In the condition of region structure and climate geography location, Beijing's ecological environment has been severely affected. In recent years, the number of sandy days and the extent of sandy days influenced by wind and sand far overrun those in ancient years, so the economy, social development and the people's lives are all affected severely.According to the terrain and topographical features, the sandy land in Beijing mainly were divided into three types that are mountain ground, the transition zone from hill to plain and plain. In this paper, Kangzhuang, Nankou and Yongding River were selected as typical damage regions, in virtue of the Remote Sense Technology, Geography and Information Systems Technology, Global Localization Technology, landscape ecological theory and some mathematic analysis methods to analyze and compare the landscape dynamic process in 1980s, 1990s and three periods after 2000. and to discuss the dynamic changes of sandy landscape type. The main research results were listed as follows:Since 1980s, the sandy landscape type has experienced great change. Take Kangzhuang, Nankou and Yongding River as representation, the bare sandy land area decreased greatly, from 2117.03 hm~2, 320.49 hm~2,3950.5 hm~2 to 1249.65 hm~2, 160 hm~2, 1542.74 hm~2 respectively, the proportion is 59.03%, 49.92%, 49.05%。By selecting landscape indexes,to analyze landscape types in the studied area, we can see that the landscape breaking extent tendency is: aggravating at first and then slowing up in Kangzhuang sand and wind damage region, persisting increasing in Nankou sand and wind damage region, aggravating at first and then slowing up in Yongding River sand and wind damage region, which were nearly related to the geography location of studied area, social economical development background, man-made interference and policy guidance.By analyzing the major factors influencing landscape dynamic change, we can see that the important factors are nature and artificial factors In the nature factors, the sandy land change has more close correlation with terrain and topographical features, surface substance, precipitation, temperature, gale and hydrographic factor. And it is mainly affected by the artificial factors such as population incensement, agriculture structure adjustability, the implement of forest engineering and social economical development background and so on.According to the results of landscape structure changes characters and major influencing factors, the indicator system for the comprehensive benefit assessment was built, which can provide scientific...