干旱半干旱区集雨绿化系统研究现状及其发展趋势

从集雨绿化系统的原理及其发展历史、设计技术参数出发，综述了国内外集雨绿化的经验和研究现状，通过兰州皋兰农业生态站的近几年的试验结果，详细讨论了集雨绿化系统的技术方法，改进集雨绿化系统各个组成部分的措施和开展集雨造林技术要点。同时，针对目前在干旱半干旱地区进行生态环境建设，建议采用微型集雨绿化系统，提高雨水利用效益，并指出今后需要开展的研究和在推广应用中需要解决的主要问题。

Actuality and Development Trend of Afforestation by Rainwater-gathering in Arid and Semiarid Regions

The area of arid and semiarid regions occupies 52.5% of the total land area of China, in which the area of the regions where the annual precipitation varies in a range of 200-25 mm and there is no agriculture if there are no irrigation works occupies 30.8 % of the total land area of China, and the area of the semiarid regions where the annual precipitation varies in a range of 250-600 mm and the agricultural production and the ecological environment are unstable occupies 21.7%. This paper summarizes briefly the history and actuality of the domestic and foreign researches on afforestation by rainwater - gathering systems, and discusses the theory and techniques of the afforestation in details. The main research content of afforestation by rainwater-gathering systems is discussed based on the various component parts of integrated rainwater - gathering systems. In view of the existing problems in regenerating the ecological environment by rainwater - gathering systems in arid and semiarid regions, it is suggested to apply subminiature rainwater-gathering systems so as to increase the utilization efficiency of gathered rainwater, and the techniques and the main problems to be solved in future research and application are also discussed.