陕北风沙滩地区土地退化机理及治理对策

LAND DEGRADATION MECHANISM AND MANAGEMENTCOUNTERMEASURES IN THE BLOWNSAND AREA OFNORTHERN SHAANXI PROVINCE

本文在分析研究区环境背景的基础上，运用定性与定量相结合的方法，对土地退化的发生机制、时空规律和发展趋势进行了系统研究。并以景观生态学理论和可持续发展思想为指导，提出了对退化性土地进行有效整治和生态重建的技术措施与对策。

n this paper, on the basis of analyzing the environmental background of the study area, the mechanism, timespace law and expansion trend of land degradation are studied systematically by means of combining qualitative analysis with quantitative one and combining remote sensing with GIS technique. The conclusions are as follows: (a) In the study area, population is the basic contributing factor of land degradation and the land degradation is a result of uncoordinated development of ecologically vulnerable environment and social economy. In especial, the potential vulnerability of the natural environment is transformed into practical destruction because of unreasonable land use and management way. (b) The main type of land degradation in the study area is land desertification. On the whole, during the past 30 years the degree of land degradation has been intensifying, and the land degradation type has showed a diversified tendency. (c) Land degradation is a dynamic process, which possesses four characteristics, namely, longterm, gradual change, continuity and locality. Therefore, higher precision and efficiency in monitoring, appraising and forecasting the land degradation can be obtained if remote sensing and GIS technique are used. (d) To manage the land degradation should take the landscape ecology theory and sustainable development ideas as the guide, consider both the ecological benefits and the economic benefits, and adopt varied technical ways . Besides, it is necessary to do the easy first and then the difficult and to take measures according to local conditions.