摘要
以5年生不同造林密度南方型美洲黑杨‘XL-90杨’Populus deltoides‘Xianglin 90’人工林为研究对象,通过分析林分平均胸径、树高、单株材积和蓄积量等指标,探究不同造林密度对‘XL-90杨’生长量的影响。结果表明,(1)随着造林密度的减小,林分的平均胸径、树高、单株材积呈先增加后减小的趋势,在造林密度减小至417株·hm^-2且株行距为4 m×6 m时,各项生长指标达均到最大值,分别为23.27 cm,17.13 m和0.291 m^3,与其他造林密度间的差异达均到了显著水平(P<0.05);(2)不同造林密度林分蓄积量呈不规律变化,在造林密度为833株·hm^-2且株行距为3 m×4 m时,林分的蓄积量达到最大值,为140.25 m^3·hm^-2;(3)采用因子分析综合评价方法确定5年生‘XL-90杨’以单株材积、林分蓄积量为培育目的最佳造林密度分别为417株·hm^-2和833株·hm^-2。
In March 2016,1-year Populus deltoides‘Xianglin 90’seedlings were planted with 6 density in Yiyang,Hunan province.In December 2019,sample plots were established for tally.The results showed that average DBH,tree height and single tree volume increased with decrease of density.The experiment demonstrated that plantation with density of 417 tree/ha and spacing in and between the rows of 4 m×6 m had the maximum growth index,mean DBH of 23.27 cm,mean height of 17.13 cm and volume of 0.291 m^3,which was significantly different from the other planting densities(P<0.05).Plantation with density of 833 tree/ha(3 m×4 m),had the maximum stand volume of 140.25 m^3/ha.The experiment resulted that the best planting density of P.deltoides‘Xianglin 90’was 417 and 833 tree/ha.
作者
唐洁
李永进
杨艳
汤玉喜
贺光宗
黄爱民
TANG Jie;LI Yong-jin;YANG Yan;TANG Yu-xi;HE Guang-zong;HUANG Ai-min(Hunan Academy of Forestry,Changsha 410004,China;Yuanjiang Forestry Institute of Hunan,Yiyang 413100,China;Yongding Forestry Bureau of Hunan,Zhangjiajie 427000,China)
出处
《浙江林业科技》
2020年第3期61-64,共4页
Journal of Zhejiang Forestry Science and Technology
基金
国家重点研发计划课题“美洲黑杨工业资源材高效培育技术研究”(2016YFD0600402)
湖南省林木种苗专项“南方型杨树种质资源收集、评价及保存”。
