摘要
依据所建马尾松（ＰｉｎｕｓｍａｓｏｎｉａｎａＬａｍｂ．）人工林生长收获模型系统，分析了不同立地指数（１４～２０）的生产力，确定了各指数级适宜培育目标。根据培育目标、立地和栽培措施的不同，设计多种建筑材培育类型，并分别求出了不同培育类型的数量、工艺、经济成熟龄，以此为基础确定了各指数级合理采伐年龄，使采伐年龄较目前正在执行的采伐年龄（３１～４０ａ）缩短４～１２ａ，内部收益率提高３～９个百分点。研究了立地、培育目标、经营状况（初植密度、间伐）、经济条件与采伐年龄的关系，随立地指数的提高，三种成熟龄均降低；随间伐次数的增多，较低造林密度的数量成熟龄加大，工艺成熟龄减小；随贴现率提高，经济成熟龄减小，每升高１％～２％，约减小１ａ，相反，经济成熟龄约推迟１ａ。
Based on the growth yield model system of masson pine plantation established already the productivities of various site indexes (14～20) were analysed, suitable cultivation objectives of various site indices was determined. According to the differences in cultivation objectives, sites and cultivation measures, a lot of cultivation types for building timber were given. The stand quantitative, technical and economic mature ages of various cultivation types were calculated, then rational cutting ages of various site indexes were determined. The results showed that the cutting age determined in this paper was shorter 4～12 years than that being used, and that IRR was raised 3%～9%. The relations between cutting age and site, cultivation objectives, silvicultural condition (planting density, thinning), economic condition were studied. The quantitative, technical and economic mature ages reduced with the raising of site index, with thinning times increase, the quantitative mature age of the lower planting density stand increase, but technical mature age reduce. The economic mature age reduce with the discount rate increasing, while discount rate raise 1%～2%, the economic mature age reduce for 1 year, otherwise, the economic mature age put off about 1 year.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1998年第3期40-46,共7页
Scientia Silvae Sinicae
基金
国家"八五"攻关课题
关键词
马尾松
人工林
建筑材
采伐年龄
模型系统
Masson pine, Forest plantation, Building timber, Cutting age, Model system
