摘要
沙漠化(SandyDesertification)是我国荒漠化(Desertification)的主要类型之一,是干旱、半干旱及部分半湿润地区由于人地关系不相协调所造成的以风沙活动为主要标志的土地退化。由于原生沙漠戈壁与沙漠化形成发展的时空范畴不同、成因的主导因素不同和演变的可逆性不同,要求我们在开展沙漠化基本问题的探索、确认主要研究内容的基础上,进一步明确沙漠化研究和防治的重点区域,为国家沙漠化防治战略决策的制订和技术措施的执行提供科学依据,使沙漠化防治工程在国家有限经费的投入下,本着因地制宜的原则,达到多快好省的效果。作者通过对近50年来野外考察和遥感动态监测成果的总结,指出,沙漠化土地主要分布在半干旱地带的农牧交错地区,半干旱地带草原区和干旱地带绿洲边缘及内陆河下游地区,反映的是人类活动和脆弱生态环境相互作用的土地退化区,在过去的50年里,沙漠化土地蔓延的主要部分也是在这些区域内。所以,它们是中国北方沙漠化研究的重点区域。根据不同时期沙漠化土地空间分布和演化的特点,依据其自然地带原则和发展强度原则,将我国沙漠化土地划分为4大区29个亚区,应是防治的重点区域。
Sandy desertification is land degradation through wind erosion resulted from inharmony man-land correlation in arid, semiarid and semi-humid regions, and it is one kind of desertification in China. Compared with original desert and grave desert the formation and development of desertification has its different space-time, vary dominant causes and distinct reversibility. In order to provide scientific guiding for the decision-making of sandy desertification controlling strategy and the implementation of technical measures it is required to define the key regions of sandy desertification research and combating based on the researches of basic issues and principal contents. Then the national sandy desertification controlling engineering can achieve its optimal effect even without adequate investment but on principle of adjust measures to local conditions. After summarizing the field surveying information and remote sensing and GIS monitoring data for last 50 years the author points out that sandy desertification land in China mainly distribute in the farming-grazing interlocked area and the steppe area of semiarid zones, the oasis rim and the lower inland river reaches of arid zone. These areas belong to the land-degraded region due to interaction between human activity and fragile eco-environment, and the sandy desertification land of China in the past 50 years mainly extended in this region. As key regions of sandy desertification research in North China sandy desertified lands in these areas can be classified into 4 large regions and 29 sub-regions according to the time-space distributing characteristics, the naturally zonal principle and the developing intensity principle.
出处
《中国沙漠》
CSCD
北大核心
2004年第1期1-9,共9页
Journal of Desert Research
基金
国家"973"沙漠化项目(TG2000048705)资助
关键词
沙漠化
荒漠化
防治
北方地区
North China
sandy desertification
studying and combating
key regions
