成武县农田林网适宜采伐龄的确定

对影响成武县农田林网采伐龄的因素做了全面系统的分析，认为除了林网本身的因素以外，防护成熟龄、气象条件、林网规格、更新方式、林粮间作和林带结构等，都是影响林网采伐龄的因素。因此，确定采伐龄应综合考虑各方面的影响，实现最佳综合效益。另外，根据一具体实例，对其采伐龄进行了研究。认为综合净现值既能体现林网本身的直接效益，又能反映林网护农增产效益，是比较合理的依据。

DETERMINATION OF SUITIABLE CUTTING AGE OF THE PROTECTION FOREST ON FARM LAND IN CHENGWU COUNTY

Factors that influence the cutting age of protection forest in Chengwu county were studied,they are:protection mature age, weather condition,standards of protection forest, the ways of regeneration, forest and farm intercropping and the stucture of the protection forest. To determine the suitable cutting age for the protection forest on farm land and achieve the optimum benefit, all the factors must be considered. An example was studied and the result showed that the comprehensive net present value was a reasonable basis for the determination of the cutting age, since it represented the benefit both of the forest itself and the framland.