龙爪小流域水土保持乔木林经济效益分析

Analysis on economic benefits of arboreous forest for soil conservation in Longzhao small watershed

营造水土保持林是防治水土流失的重要技术措施,具有调节小气候,保持生态平衡,抗御自然灾害,提供“四料”,增强水土流失区农业生产后劲等重要作用。但是,由于水土保持林的造林立地条件通常比较严酷,林木生产率低,生产周期长,一般乔木需要10～20年乃至更长时间才能成材,短期获得的经济效益较小,加之在水土流失区农业生产力发展水平较低,所以农民一般不愿经营。为了揭示人工营造水土保持林的经济效益,我们对林口县龙爪小流域水土保持林体系作了实测。

The economic benefits of arboreous forest for soil conservation in Longzhao small watershed is analysed and evaluated by using a dynamic linear programming method of mul-tisection decision on base of data collected through on-the-spot investigation and statistic data for years.The result shows the output value per yuan of the forest for conservation is 6.25 or 3.91 times of that of maize or bean and the energy efficiency is 7.9 or 9.4 times respectively.