摘要
通过杨树标准地和解析木的调查分析，建立了预测精度较高的杨树生长收获模型。运用动态经济评价方法，利用建立的生长收获模型，确定了不同立地条件下各培育目标优化栽培模式。结果表明：（1）在贴现率较低（3％）的情况下，培育中小径材的初植密度应控制在2500株／hm^2左右，主伐年龄为14～15a，与传统栽培采用的7～8a主伐比较，净现值提高1982．41～31243．33元／hm^2，内部收益率提高4．1％～9．3％。（2）只有在16指数级及以上的造林地培育大径材才有一定的收益，造林密度应控制在208-625株／hm^2，主伐年龄为14-22a。（3）在中等贴现率（7％）时，培育杨树中小径材的初植密度为2500株／hm^2左右，主伐年龄为9～12a，比传统栽培模式净现值提高482．22-12413．07元／hm^2，内部收益率提高5．2％～11．4％，培育大径材的初植密度为208-625株／hm^2，主伐年龄为16-22a。（4）在贴现率较高（12％）情况下，培育中小径材的初植密度应控制在2500株／hm^2左右，主伐年龄为8～9a，与传统经营方法比较，净现值提高1171．36～4025．03元／hm^2，内部收益率提高3．1％～8．6％。
On the basis of analyzing and investigating the plots and stem analysis of poplar, the growih and yield models of poplar were established. Based on the growth and yield models, the optimum cultivation patterns of poplar plantations for every site index and various cultivation objectives were obtained by using method of dynamic economic evaluation. The results showed that the optimum patterns of cultivating middle woods and small logs should control planting density about 2 500 tree/hm^2 and cutting age about 14- 15 a in lower discount rate（3 %）. The net present value（NVP） was respectively increased 1 982.41 31 243. 33 yuan/hm^2 and the inner revenue rate（IRR） was respectively increased 4. 1% 9.3 % than those conventional cultivation patterns, which felling age were 7 - 8 a. The incomes can get from poplar plantation for cultivating large timber in the conditions of the site index equal or higher to 16 and planting density about 208-625 tree/hm^2 and cutting age about 14-22 a. The optimum patterns of cultivating middle woods and small logs should control planting density about 2 500 tree/hm^2 and cutting age about 9- 12 a in discount rate equal to 7 %, the NVP was respectively increased 482.22-12 413.07 yuan/hm^2 and IRR was respectively increased 5.2 % -11.4 % than those conventional cultivation patterns. The optimum cultivation patterns of cultivating large timber should control the planting density about 208-625 tree/hm^2 and cutting age about 16-22 a. The optimum patterns of cultivating middle woods and small logs should control planting density about 2 500 tree/hm^2 and cutting age about 8 - 9 a in discount rate equal to 12 %, the NVP was respectively increased 1 171.36-4 025.03 yuan/hm^2 and IRR was respectively increased 3. 1 %-8. 6 % than those conventional cultivation patterns. These studies can provide technical references for cultivation and management of poplar plantation.
出处
《南京林业大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第6期73-78,共6页
Journal of Nanjing Forestry University：Natural Sciences Edition
基金
武汉市重点攻关项目(2002200513207)
关键词
杨树
优化栽培模式
生长收获模型
Poplar Optimum cultivation pattern Growth and yield model
