摘要
对河南省五马寺林场17 a生6种密度日本落叶松试验林调查数据进行分析并做经济效益对比。结果表明,胸径、保存率、单株材积和冠幅均表现出随初植密度增加而减小的趋势;而其当年高、树高、枝下高和公顷蓄积量则随着密度的增加而增加。且在日本落叶松生长的初期,由于林分没有郁闭,树木个体间的竞争很小,密度效应不明显,随着林龄的增加,到8 a(1997)时密度在生长量上的差异才逐渐的表现出来,到17 a(2006)生时,密度对生长量的影响达到极显著的程度。由经济效益分析知,密度A2的净现值最大,其效益成本比(BCR)和内部收益率(IRR)分别为4.82和25.35%,因此,在该地区营造日本落叶松时建议采用3 330株.hm-2的密度,即1.5 m×2.0 m行间距。
The influence of initial density on Larix kaempferi growth and economic performance was studied, based on the experimental forest of 6 kinds of density in Wumashi Forestry Farm, Henan Province. The results showed that mean DBH （diameter at breast height）, survival rate, tree volume and crown width decreased with initial density increasing, but tree height, current height increment, under branch height, and standing stock increased with initial density increasing. At the initial stage of growing, the density did not affect the growth significantly until they reached 8 years old. The initial density had especially significant effects on the DBH, crown width, under branch height, survival rate, tree volume and standing stock of 17-year-old Larix kaempferi. The suggested initial density for short rotation pulpwood plantation of Larix kaempferi in south temperate alpine zone was 3 330 trees· hm^-2 ,namely 1.5 m ×2.0 m,of which the BCR,IRR were 4. 82 and 25.35% ,respectively.
出处
《安徽农业大学学报》
CAS
CSCD
北大核心
2010年第4期649-654,共6页
Journal of Anhui Agricultural University
基金
国家"十一五"科技支撑课题(2006BAD24B06
2006BAD01A14)资助
