Study Of Current Situation Of Desertification In China From CEWBMS

Desertification as the most serious ecological problem of China not only affected directly the socioeconomic development of the northern arid areas, but also imposed an effect on the atmospheric environment and human life of locality and eastern China. To have a full clear picture of the situation and trend of the desertification and sandification of the country, a basic inventory and reflecting Chinese national practical condition has been initiated in the country. With the development of society economy, it is not enough to macroscopic every five years. So it became a studied question to portraying rapidly and accurately the current condition and trend of the desertification and sandification of the country.Climatic change plays an important role in desertification process and under the current condition the impact of global climatic changes on desertification should be greater and more far-reaching. The article sets forth methodology of current situation and trend of desertification in China from China Energy and Water Balance Monitoring System in the cooperation project between China and Holland. The CEWBMS provides a new, technically and scientifically sound methodology of climatic moisture types, products up-to-date distribution maps of desertification climate types, tracks the dynamics in the distribution of these climate types as a result of the global climate and studies the changes in soil moisture index between two or more years. The change of vegetation environment was monitored by geostationary satellite for current situation and trend of desertification. And the tendency of the overall expansion of desertification from CEWBMS was validated by the conclusions of Third National Monitoring of Desertification and Sandification. Therefore the CEWBMS relative evapotranspiration product is a meaningful and objective data source for drought monitoring. These products are derived from geostationary satellite images in a convenient, fast and low cost way with wide coverage. Thus it is very useful for drought monitoring over a big area and may have a bright future in drought monitoring applications. Long monitoring time series will considerably enhance the analysis and quality of dedicated CEWBMS products. We will continue to explore the benefits of the system and try to gain more using uniting other monitoring techniques.