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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。
On the basis of typical surveys, the annual value of farmland shelterbelts, soil and water conservation forests, windbreaks and sand-fixation forests, and pasture shelterbelts protected and directly benefited from the construction of the “Three Norths” region from 1949 to 1981 is estimated to be 25 The value of annual benefit is 67% of the investment. It proves that the construction of the “Three Norths” large-scale shelterbelt system has good economic results. It can improve the ecological environment, increase the output of agriculture and animal husbandry and raise the living standard of the people, and the investment direction is correct. In the future, we should speed up the pace of construction and improve the quality of construction.