造林配置对超短轮伐杨树无性系生长量的影响

Effects of Initial Planting Spacing on Growth of Populous Plantation

采用标准木调查法，对6种造林配置（株行距30cm×30cm，30cm×40cm，30cm×50cm，50cm×40cm，50cm×50cm，50cm×80cm）1～3年生欧美杨‘L35’杨树试验林的生长和地上生物量进行分析。结果表明：随着造林配置密度的增加，欧美杨‘L35’胸径逐渐减小，单株生物量下降，而地上生物量逐渐增加，树高与造林密度之间关系不密切；2年生L35杨胸径、树高、单株生物量比1年生各生长指标增幅较大，而3年生L35杨各生长指标较2年生L35杨增幅不明显。

The method of sample tree had been taken to survey and analysis the growth and aboveground biomass of one to three years old Populus x euramericana cv. ‘79-35＇ in 30cm×30cm,30cm×40cm,30cm× 50cm,50cm×40cm, 50cm×5Ocm and 50cm×8Ocm planting spacing.The results indicated that the diameter and individual biomass decreased with spacing increasing.The aboveground biomass increased with spacing decreasing.There was not intimate relation between the height and planting composition.Compared to the growth indexes of one year old poplar trees, the two years old poplar trees had higher increase in diameter, height and individual biomass.The three years old poplar trees had smaller increase in growth indexes than that in two years old poplar trees.