西南桦轻基质网袋容器苗的质量评价指标  

Quality Assessment Index of Betula alnoides Seedling Growing in Light Media in Net Container

作　　者：黎明[1] 曾杰[2] 郭文福[1] 吴光枝[1] 

机构地区：[1]中国林业科学研究院热带林业实验中心,广西凭祥532600 [2]中国林业科学研究院热带林业研究所,广东广州510520

出　　处：《贵州农业科学》2011年第6期178-180,共3页Guizhou Agricultural Sciences

基　　金："十一五"国家科技支撑专题"西南桦用材林高效培育技术"(2006BAD24B0902)

摘　　要：为制定西南桦轻基质网袋容器苗的分级标准,为营建高效西南桦人工林奠定基础,采用主成分分析法确定西南桦轻基质容器苗质量评价的主要指标,应用逐步聚类分析研究其分级标准,并通过造林效果试验对分级结果予以验证。结果表明:西南桦苗木可分为3级,Ⅰ级苗:苗高H≥28.5 cm、地径D≥2.0 mm,Ⅱ级苗:28.5 cm>苗高H≥23.9 cm、2.0 mm>地径D≥1.5 mm,Ⅲ级苗:苗高H<23.9 cm、地径D<1.5 mm;造林半年后不同级别苗木的造林效果差异明显,Ⅰ、Ⅱ级苗的造林成活率均在85%以上,两者苗高、地径生长量差异显著(P<0.05),Ⅲ级苗的成活率低于75%,其生长量极显著低于Ⅰ级、Ⅱ级苗(P<0.01)。Main indexes for quality assessment of Betula alnoides seedlings growing with light media in net container were screened out by principal component analysis,and classification standard of the seedlings was studied by gradual cluster analysis and confirmed the grading results by planting trial to establish the classification standards and build the artificial forest.The results showed that the seedlings could be divided into 3 grades,H≥28.5cm and D≥2.0mm,28.5cmH≥23.9cm and 2.0mmD≥1.5mm,and H23.9cm and D1.5mm belonged to grade 1,2,and 3,respectively.The differences were obvious in the planting trial half a year later,the seedling survival rate of both grade 1 and 2 were all above 85%.There were significant difference（p0.05） in seedling height and stem diameter around ground between grade 1 and 2.For grade 3,the survival rate was less than 75%,and the mass growth was very significantly lower than both seedlings in grade 1 and 2（p0.01）.

关 键 词：西南桦 轻基质容器苗 苗木分级 主成分分析 逐步聚类分析 

分 类 号：S792.15[农业科学—林木遗传育种]