摘要
苏南低山丘陵地区杉木林采用短周期（１２～１５年主伐）栽培模式，其生产力和经济效益显著高于长周期（１９～２６年主伐）模式。短周期第２茬萌芽更新（１０年主伐）模式也有类似效果。地位指数１４ｍ，１５年主伐模式（Ⅲ１）比２６年主伐模式（Ⅰ）总出材量增加５８．３％；林地等价年值，内部收益率，益本比分别提高５．２４倍，１６．６５％，２．１５倍。地位指数１２ｍ，１２年主伐模式（Ⅳ１）总出材量比１９年主伐模式（Ⅱ）产材量增加１２．２％；林地等价年值，内部收益率，益本比分别提高１．６４倍，４．４１％和１．３０倍。两茬延续作业（第２茬萌芽更新，１０年主伐），在相近的生产周期内因栽培作业茬数增加，模式Ⅲ和模式Ⅳ的总出材量分别比模式Ⅰ与模式Ⅱ增加９１．１％～１１４．０％；林地等价年值，内部收益率，益本比分别增加１６５．７％～４５８．０％；４．４８％～１６．６６％；１３６．９％～１８２．０％。
The Chinese fir productivity and economical effect of using short period (12 15years old principal felling) planting form is significant high than that of using long period (19～26years old principal felling) planting form in hilly area of the south of Jiangsu.It is similar to short period second stubble sprout regeneration (10 years old principal felling ) form.The total outturn of 15 years old principal felling form (Ⅲ 1) increased by 58 3% than that of 26 years old principal felling form (Ⅰ) in 14 meters high site, the equivalent annual value of forest land,internal rate of reture and rate of benefit and cost increased special by 5 24 times,16 65% and 2 15 times.In 12 meters high site,the total outturn of 12 years old principal felling form (Ⅳ 1) increased by 12 2% than that of 19 years old principal felling form (Ⅱ),the equivalent annual value of forest land,internal rate of reture and rate of benefit and cost increased special by 1 64 times,4 41% and 1 30 times.Two stubbles succession planting (second stubble sprout regeneration and 10 years old principal felling form),due to the number of stubble increased, the total outturn of form Ⅲ and the form Ⅳ increased special by 91 1%～114% than that of form Ⅰ and form Ⅱ.The equivalent annual value of forest land,internal rate of return and rate of benefit and cost increased special by 165 7%～458 0%,4 48%～16 60% and 136 9%～182 0%. Author’s address Forestry Science Research Institute of Jiangsu,Nanjing 211153 PRC
出处
《江苏林业科技》
1997年第4期1-7,共7页
Journal of Jiangsu Forestry Science & Technology
基金
江苏省"八五"农业基金
关键词
杉木
栽培模式
经济评价
等价年值
收益率
Chinese fir
Planting form
Economical evaluation
Equivalent annual value
Internal rate of reture
Rate of benefit and cost
