摘要
以雷州半岛11个桉树幼龄林无性系为研究对象,采用方差分析、相关性分析、系统聚类等方法,对比分析其胸径、树高、蓄积量、保存率和抗风性差异特征,以筛选生长和抗风均优良的品系,为培育高产抗风品系提供科学指导和数据支持.结果表明:桉树无性系2年生风害指数(3.61)显著高于1年生风害指数(2.35),且风害指数与生长量指标呈现出显著正相关.台风灾害后,1年生L59、L39无性系具有较高的保存率,分别为86.11％和84.16％,表现出良好的抗风性;2年生L57无性系具有较高的保存率,为74.53％,抗风性表现较好.以群体生长量均值为标准,L61、L39、L53、L54的树高、胸径、蓄积均高于群体均值,表现出良好的生长特性.系统聚类分析结果显示,1年生无性系L39、L59、L60、L61具有一定的抗风和速生特性;2年生无性系L57、L55、LH1表现出较好的抗风能力.
Abstract
In this study,young plantations of 11 clones of eucalypts in the Leizhou Peninsula were used as the research object. Variance analysis,correlation analysis and system clustering were used to compare and analyze differences in diameter at breast height,tree height,volume,preservation rate and wind resistance,and to screen out the clones with excellent growth and wind resistance. The results showed that wind damage index of 2-year-old trees of clones (3.6) was significantly higher than that of 1-year-old trees of the same clones (2.4),and the wind damage index showed a significant positive correlation with growth index. After a typhoon disaster,1-year-old trees of clones L59 and L39 had higher preservation rates,which were 86.11％ and 84.16％ respectively,thus showing good wind resistance. The preservation rate of 2-year-old trees of clones of L57 was 74.53％ after the typhoon,indicating good wind resistance. Taking the mean value of population growth as the standard,the tree height,diameter at breast height and volume of clones L61,L39,L53 and L54 were higher than the mean value of the population,showing good growth characteristics. The results of systematic cluster analysis showed that clones L39,L59,L60 and L61 had good wind resistance and fast-growth characteristics as 1-year-old trees. Meanwhile,2-year-old trees of clones L57,L55 and LH1 showed better wind resistance.
维普
万方数据