杨树短轮伐期萌芽更新造林与插干造林对比试验

Comparative Trial of Poplar Short Rotation Sprout Regeneration under Sprout Method and Cuttage Forestation

为了探索洞庭湖区杨树不同更新模式的可行性,对XL-90杨萌芽更新造林与插干造林的林分生长及经济效益进行对比研究。萌芽更新造林每个伐桩保留2个萌条,成林后实际密度1 170株·hm^(-2);插干造林株行距为4 m×3 m,平均株数840株·hm^(-2)。结果表明,更新造林4 a,萌芽更新的胸径、树高、单株材积和单位蓄积依次为17.47 cm、14.62 m、0.143 5 m^(3)和167.93 m^(3)·hm^(-2),分别比插干造林高6%、2%、14%和59%,单位面积利润高达26 890元·hm^(-2),是插干造林的3倍。综上所述,XL-90杨在洞庭湖区适宜短轮伐期萌芽更新造林。

In order to explore the feasibility of different regeneration modes of poplar in Dongting Lake area, the stand growth and economic benefits of XL-90 poplar regeneration under sprout method and cuttage forestation were compared.Two sprouts were retained for each stump in the regeneration under sprout method, and the actual density was 1 170 plants·hm^(-2)after afforestation;The row spacing of the cuttage forestation is 4 m×3 m, and the average number is 840 plants · hm^(-2).The results showed that the DBH,tree height, individual volume and unit volume of the regeneration under sprout method were 17.47 cm, 14.62 m, 0.143 5 m^(3) and 167.93 m^(3) · hm^(-2),respectively, which were 6 %,2 %,14 % and 59 % higher than those of the cuttage forestation.The profit per unit area was 26 890 yuan · hm^(-2),which was three times higher than that of the cuttage forestation.In summary, XL-90 poplar is suitable for the cuttage forestation in Dongting Lake area during short rotation.