造林密度对材用樟树幼林生长和蓄积量的影响  

Effects of planting density on the growth and stand volume of Cinnamonum camphora plantations

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作  者:刘新亮 章挺[1] 邱凤英[1] 符潮 周诚[1] LIU Xinliang;ZHANG Ting;QIU Fengying;FU Chao;ZHOU Cheng(Camphor Engineering and Technology Research Center of State Forestry Administration,Jiangxi Academy of Forestry,Nanchang 330032,Jiangxi,China)

机构地区:[1]江西省林业科学院国家林业和草原局樟树工程技术研究中心,江西南昌330032

出  处:《中南林业科技大学学报》2019年第3期23-27,60共6页Journal of Central South Forestry University

基  金:国家重点研发计划项目(2016YFD0600605);江西省林业科学院博士启动项目(2017522701).

摘  要:以7年生不同造林密度樟树人工林为研究对象,通过分析林分平均胸径、树高、枝下高、冠幅、单株材积和蓄积量等指标,探究造林密度对樟树幼林林分生长及林分蓄积量的影响。结果表明:1)随着造林密度的增大,樟树林分平均胸径、冠幅和单株材积均呈现减小的规律,造林密度为833株·hm^-2时平均胸径、冠幅和单株材积均最大;2)造林密度对林分平均树高的影响较小,枝下高随造林密度的增大而逐渐增高,造林密度为2500株·hm^-2时林分枝下高最高;3)随着造林密度的增大,林分蓄积量呈现先增大后减小的规律,造林密度为1111株·hm^-2时林分蓄积量达到最大值;4)各密度条件下林分胸径生长过程相似,但胸径生长旺盛期的持续时间随造林密度的增大而逐渐减少,造林密度为833株·hm^-2时胸径生长旺盛期持续时间最长;5)不同密度林分单株材积连年生长量呈先增大后减小的趋势,林分单株材积快速增长期持续时间随造林密度的增大而减少;6)综合考虑,樟树人工林适宜造林密度为1111株·hm^-2,合理造林密度范围为1111~1667株·hm^-2。In order to explore the effects of planting densities on the growth and stand volume of young Cinnamonum camphora plantations,7-year-old C.camphora plantations with different planting densities were analyzed by measuring stand average DBH,tree height,height under branch,crown width,individual volume and stand volume.The results show that:1) The average DBH,crown width and individual volume decreased with increasing planting density,the average DBH,crown width and individual volume reached the maximum when the stand density was 833 strains·hm^-2;2) The influence of planting density on average tree height of stands was relatively small.,while the height under branch increased with the increase of stand density,And the height under branch reached the maximum when the stand density was 2 500 strains·hm^-2;3) With the increase of afforestation density,the stand volume of forest stand increased first and then decreased,and reached the maximum when the stand density was 1 111 strains·hm^-2;4) The growth process of DBH at each stand densities had the similar process,however,the duration of the vigorous growth of DBH gradually decreased with the increase of afforestation density,and the longest duration of DBH growth was when the afforestation density to be 833 plants·hm^-2;5) The current annual increment of individual tree volume of different densities increased first and then decreased,and the duration of rapid growth of stand volume per plant decreased with increasing planting density;6) Considering comprehensively,the suitable afforestation density of camphor plantation is 1 111 plants·hm^-2,and the reasonable afforestation density ranges from 1 111 to 1 667 plants·hm^-2.

关 键 词:樟树 樟树人工林 造林密度 幼林 生长过程 林分蓄积量 

分 类 号:S792.23[农业科学—林木遗传育种;农业科学—林学]

 

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