【摘要】 以江汉平原主栽的4个黑杨品种为材料，设置5种密度，连续6 a进行不同林分的胸径和树高性状测定，开展不同品种不同密度不同林龄材积特征比较。结果表明，不同品种间、不同密度间6 a生的胸径和树高性状皆存在极显著差异；不同品种在不同密度不同林龄时，其每公顷蓄积量及单株材积年均净增长量都表现出不同的积累特征及净增长特征。在江汉平原培育杨树4～6 a过程中，要收获单位面积最大蓄积，‘2025杨’需选择6 m×6 m密度，‘楚林2号杨’和‘丹红杨’需选择2 m×6 m密度，‘华石2号杨’需选择3 m×6 m密度。对于单株材积年均净增长，不同品种在不同密度不同林龄时其增长速度不同，‘2025杨’在5种密度不同林龄时年净增长速度相近，但其他3个品种不同密度不同林龄的年净增长速度差异较大。本研究发现江汉平原地区不同黑杨品种在不同密度下的蓄积特征，为该地区杨树丰产栽培提供科学依据。更多还原

【Abstract】 In this study, the DBH and height traits of 4 varieties of Populus nigra in Jianghan Plain were measured under 5 kinds of densityfor 6 consecutive years, and the volume characteristics of different varieties under different densities and different ages were compared.The result showed that there were significant differences in DBH and height traits among different varieties, different densities with 6 years old.The cumulative volume growth per hectare and the average annual net volume growth per tree of different varieties showed different characteristics at different densities and different ages.The results showed that in order to harvest the maximum volume per unit area during 4-6 years of poplar cultivation in Jianghan Plain, the density of P.deltoides ‘2025’ should be 6 m×6 m, the density of P.×euramericana ‘Chulin 2’ and P.deltoides ‘Danhong’ should be 2 m×6 m, but the density of P.deltoides ‘Huashi 2’ should be 3 m×6 m.As for the average annual netvolume growth rate of individual tree, different varieties had different growth rates at different densities and different ages.The net growth rate of P.deltoides ‘2025’ was similar with the 5 different densities and different ages, but the net growth rate of the other 3 varieties with different densities and different ages was significantly different.This study found the stand volume characteristics of different P.nigra varieties under different densities in Jianghan Plain, and provided scientific basis for poplar cultivation in this area.更多还原