杂交相思对造林密度的响应  

Response of Acacia mangium×A.auriculiformis to Afforestation Density

作　　者：曹艳云[1] 郝海坤[1] 黄志玲[1] 何琴飞[1] 彭玉华[1] 蒙芳[1] 吴秉堃 陆国导[1] Cao Yanyun;Hao Haikun;Huang Zhiling;He Qinfei;Peng Yuhua;Meng Fang;Wu Bingkun;Lu Guodao(Guangxi Forestry Research Institute,Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning,Guangxi 530002,China;Chongqing Baolvfeng Biotechnology Co.,Ltd.,Chongqing 400000,China)

机构地区：[1]广西壮族自治区林业科学研究院,广西优良用材林资源培育重点实验室,广西南宁530002 [2]重庆保绿丰生物科技有限公司,重庆400000

出　　处：《广西林业科学》2022年第5期652-656,共5页Guangxi Forestry Science

基　　金：广西植物新品种保护与应用项目(gl2018kt20)。

摘　　要：为确定杂交相思(Acacia mangium×A.auriculiformis)适宜的造林密度,设置2500、2222和1667株/hm23个造林密度,开展不同密度造林试验,造林后6年内定期调查林分树高、胸径和单株材积,调查和计算6年生林分的保存率和蓄积量,对指标进行分析。结果表明,造林密度对树高、胸径、单株材积、保存率和蓄积量均影响显著。6年生时,平均树高在1667株/hm2密度林分中最高,胸径和单株材积均在2222株/hm2密度林分中最高。随林龄增加,各密度林分的树高和胸径年净增长量均呈先降后升的趋势,单株材积年净增长量均呈上升趋势。随林分密度增加,保存率呈下降趋势,蓄积量呈先升后降的趋势。单株材积受造林密度影响最大,保存率影响最小。作为纸浆用材林,可选择2222株/hm2造林密度,该密度林分的蓄积量最大。In order to explore suitable afforestation density of Acacia mangium×A.auriculiformis,three afforestation densities(2500,2222 and 1667 plant/hm2)were set to carry out afforestation density test.Heights,DBHs and individual volumes of stands for six years were investigated,and retention rates and accumulations of 6-year-old stands were investigated and calculated.These indexes were analyzed.Results showed that afforestation density had significant effects on height,DBH,individual volume,retention rate and accumulation.When stand age was 6-year-old,height was the highest in stand with density of 1667 plant/hm2,and DBH and individual volume were the highest in stand with density of 2222 plant/hm2.With increase of stand age,annual net increments of heights and DBHs in stands with different densities showed trends of decrease firstly and then increase,and annual net increments of individual volumes showed trends of increase.With increase of afforestation density,retention rate showed trend of decrease,and accumulation showed trend of increase firstly and then decrease.Afforestation density had the most significant effect on individual volume and minimal effect on retention rate.As pulp wood forest,the optimal afforestation density was 2222 plants/hm2 with the largest accumulation.

关 键 词：杂交相思 造林密度 生长量 

分 类 号：S792.99[农业科学—林木遗传育种]