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作者根据森林水分平衡原理,采用大面积调查、定位观测及必要的补充测试等方法,对河北太行山区现有三千四百零五点三八平方公里的有林地,进行了大量调查研究。研究结果表明,1.森林涵养水源的年效益值为13.9亿吨、相当于1.807亿元;2.森林防止泥沙流失效益的年计量值为89.26(百万吨),相当于0.0248亿元;3.森林防止土体崩塌的年效益值为24.63(百万吨),相当于0.0068亿元;4.森林防护效益年总额是年直接产值的9.3倍。
Based on the principle of forest water balance, a large area investigation, positioning observation and necessary supplementary testing are carried out to investigate the existing 3,408.38 square kilometers of forest land in Taihang Mountainous Area of Hebei Province. The results show that: 1. The annual benefit value of forest water conservation is 1.39 billion tons, equivalent to 180.7 million yuan; 2. The annual effective measure of forest sediment loss prevention is 89.26 (million tons), equivalent to 0.0248 billion yuan; 3. The annual benefit value of forest in preventing soil collapse is 24.63 (million tons), equivalent to 0.0068 billion yuan; 4. The total annual benefit of forest protection is 9.3 times of the direct output value of the year.