黑杨派新无性系工业用材林经济效益的研究──Ⅰ.营林成本构成、时间序列与效益

Studies on Economic Efficiency of Industrial Timber Forest of New Clone of Populus nigra L.──Ⅰ. Cost Copmosition, Time Series and Efficiency of Forest Construction

采用静态经济指标分析了富阳和临海的新无性系短轮伐期工业用材林的经济效益，结果表明：短轮伐 期工业用材林的营林成本主要由种苗、肥料和劳务三部分费用构成，三者的比例在不同地区、不同营林时间 差异极大；现实林分营林成本的７９．８％～９２．３％都发生在造林当年，资金的投入相对比较集中；临海点５年生 林分产值为 １２ ０１５．００～２９ ８０８．００元／ｈｍ２，富阳纸浆林 ６年生时产值为 １６ ４１１．５０～２４ ７９５．００元／ｈｍ２。产出投入 比高达３．７８～６．７１和４．１３～４．８０：无性系是影响经济效益的最主要因素之一，临海点３６６无性系产值是６９对 照无性系（３×３密度时）的１．９９倍；各种造林密度下平均利润３６６的是６９的２．１９倍，造林密度是另一影响经济 效益的主要因素。

Economic efficiency of short-rotation industrial timber forest of new clone of Populus nigra was analysed,by application of static economic index.The results shown that its afforestation cost mainly consisted of three parts,namely seedling, fertilizer and labour service.Their preportion had great difference among the areas. Clone and planting density were the main factors affecting its economic efficiency.