长江上游防护林体系建设要点

本区防护林体系的建设目标是:改善生态环境,发展山区经济。人口稠密区防护林体系建设成败的关健在于:能否掌握生态生产双重功能,是否具有生态社会经济三大效益。为此进行了防护林体系分类,提出了林种的生态功能指标和生产功能指标。防护林体系的生态经济分区要研究生态经济系绽的地域差异,有助于发挥各个林种的生态生产双重功能,是建设防护林体系的重要途径,为合理布局提供科学依据。

ESSENTIALS OF THE PROTECTIVE FOREST SYSTEM CONSTRUCTION IN THE UPPER REACHES OF THE CHANGJIANG RIVER

The upper reaches of the Changjiang River consists of the basins of the Wujiang.Jialing and Tuojiang Rivers within the boundary of Sichuan Province,and the uper reaches of the Minjiang River.The region with high density of population,lack of cultivated land,heavy water and soil loss and backword rural economy, faced serious ecologic- economic problems. Therefore it is necessary to construct widely and multitype artificial forest system to solve such problems.The research shows that it needs to put in same positions to both ecologic and economic effects of forest system,especially in the populatlonal region. According to the effect and purpose of forestation,the whole system can be divided into three subsystems,i, e. ecologic,ecologic-economic and economic-ecologic patterns,and a lot of relative patterns, some ecologic and productive indexes have been proposed which can be used for the qauntitative classification of protective forest system. According to the regional differentiation in ecology and economy,the principles of ecologic-economic regionalization in forest system planning at the upper reaches of the Changjiang River are discussed.