造林密度对南方红豆杉人工林生长性状的影响

Effects of Planting Density on the Growth Traits of Taxus wallichina Plantation

为明确造林密度与南方红豆杉生长性状之间的关系,测定福建省明溪13年生不同造林密度南方红豆杉的生长和干形形质等指标,分析造林密度与生长和干形形质之间的关系,对其进行综合效果评价。结果表明:造林密度显著影响林分11个生长形质指标和综合得分值。南方红豆杉不同造林密度人工林的径阶分布采用Weibull分布函数拟合效果较好;1 800、2 400、3 000株/hm^2造林密度林分结构相对稳定、竞争较合理,而3 600株/hm^2的林分处于竞争期的自然稀疏后期。不同造林密度南方红豆杉林分林木分级显示,目前只有3 600株/hm^2造林密度出现Ⅴ级木。因此,营建南方红豆杉人工材用林合理造林密度为3 000株/hm^2。

In order to evaluate the effects of planting density on the growth traits of Taxus wallichina, periment with different planting densities for 13 years T. wallichina plantation was established in Mingxi the ex- County, Fujian, to measure the indices of the growth and stem form indexes of T. wallichina seedlings. The relationship a- mong the planting density, growth and stem form were investigated. The 4 classes of planting density were evaluated comprehensively. The results showed that planting density significantly affected 11 indices. The model fitting diame- ter distribution for different planting density of T. wallichina plantation with cumulative distribution function of Weibull distribution was good. The diameter distribution for plantation with 1 800 trees · hm-2, 2 400 trees · hm-2 and 3 000 trees · hm-2 planting density had been undergoing stable stand structure and reasonable competition. However, the diameter distribution for plantation with 3 600 trees · hm-2 planting density were in the late stage of natural thinning of competition period. The forest classification of T. wallichina plantation with different planting density showed that there has not yet appeared V grade wood except for 3 600 trees · hm-2 planting density. There- fore, the construction of T. wallichina artificial timber forest should be carried out to select planting density, and its reasonable planting density is 3 000 trees · hm-2.