【摘要】 国家973项目“中国北方沙漠化过程及其防治研究”(G2000048700)恢复了过去2 ka来我国北方沙漠化过程、演变、格局和驱动机制;揭示了土壤风蚀和沙尘起动的物理机制,确定了土壤风蚀容忍量、定量评价体系,风沙电场形成机理、分布规律和影响;确定了主要沙尘源区、沙尘暴移动规律和形成机制,建立了沙尘暴监测、预报预警方法和系统;研究了土壤碳、氮衰减规律及其对沙区植被的影响,揭示了沙漠化过程中植物的受损过程、适应对策和植被恢复机理,阐明了我国近50 a沙漠化的过程、成因、现状及其发展趋势,定量给出沙漠化空间变化态势,提出了重点地区防治沙漠化、社会经济与环境协调发展的模式和对策。为国家防沙治沙和干旱地区生态环境和社会经济可持续发展战略决策提供了科学依据。发展和完善了中国沙漠与沙漠化科学。更多还原

【Abstract】 The National Key Basic Project(973) \!Process and Controlling of Aeolian Desertification in North China\"(2000048700) has got the following research results: has reestablished the development,succession,situation and driving mechanism of aeolian desertification in North China during late 2000 years;has disclosed the physical mechanism of soil wind erosion and sand-dust moving;has determined the wind erosion tolerance capacity of soil;has found the formation mechanism,distribution rule and impact of wind blown electrify field;has set up the quantity evaluating system;has confirmed the source area,moving route and formation mechanism of sand-dust,and has established the monitoring,forecasting and for-alarming method and system of sand-dust storm;has studied the attenuation law of C,N in soil and its influence on desert vegetation;has showed the harmed process,adapted countermeasure and recover mechanism of vegetation during aeolian desertification process;has clarified the process,cause,status and development and trend of aeolian desertification in North China during late 50 years;quantificationally showed the spatial distribution and change of aeolian desertification,and has put forward the model and countermeasures of controlling aeolian desertification and coordinating the social economy and environment in typical areas.These results from the project provide the scientific theory for government to control aeolian desertification and make the strategy of sustainable development of arid regions economy and eco-environment,and also has enriched and developed the theory system of Desert Science.更多还原