三北防护林经济效果研究

在典型调查的基础上,推算出从四九年至八一年“三北”地区建设范围营造的农田防护林、水土保持林、防风固沙林、牧场防护林防护效益和直接效益的年价值为二十五亿元,年效益的价值为投资的百分之六十七。证明建设“三北”大型防护林体系具有良好的经济效果,它可以改善生态环境,增加农牧业产量,提高人民生活水平,投资方向是正确的。今后,应加快建设速度,提高建设质量。

STUDIES ON ECONOMIC BENEFIT OF SHELTERBELTS PLANTED IN NORTH,NORTHWEST AND NORTHEAST CHINA

Based on definite typical investigations, the economic values of protective benefit and direct benefit as effected by farmland shelterbelts,water and soil conservation shelterbelts,windbreaks and sandbreaks,as well as pastureland shelterbelt,which were planted from 1949 to 1981 in regions of North, Northwest and Northeast China, have been estimated. The sum of values amounts to 2500 million yuan (Ren minbi) per year.It is equal to 67 percent of the funds invested in planting these shelterbelts in the past 31 years.This fact indicates that construction of large-scale shelterbelt systems will produce significant benefit,by improving eco-envi ronment.increase of yields of farm crops and products of animal husbandry, with a result of raising the people's, living standard. These investigations also prove that such financial investments are correct and worthwhile,what should be done further is to speed up and enlarge planting such shelterbelts and improve their effectiveness.