胡杨防护林造林性状分异研究

Differentiation of Afforestation Characters of Populus euphratica Shelterbelt

为探索新疆防护林主要造林树种胡杨选优的可行性,对新疆兵团石河子垦区新造胡杨林带多项性状指标进行了测定分析,结果表明:胡杨树高、胸径及冠幅为单峰钟形分布,其中树高数据分布较为对称,而胸径和冠幅数据右侧尾部比较长,表现出左偏分布特征;分枝角度数据呈现出多峰形态;高度与胸径、胸径与冠幅有较强正相关性,树高与冠幅及冠幅与分枝角度有较弱的正相关性,而树高与分枝角度、胸径与分枝角度不相关;胡杨冠幅和胸径指标主导了聚类结果,尤其是利用冠幅指标能够将胡杨样本界限分明地分为“大胡杨树”“中等胡杨树”和“小胡杨树”3类。

In order to explore the feasibility of selecting Populus euphratica as the main tree species in Xinjiang shelterbelt,a number of characteristics of Populus euphratica shelterbelt in Shihezi City of Xinjiang were measured.Result shows that the height,DBH&crown width of Populus euphratica are single peak bell distribution,in which the height data distribution is more symmetrical,while the right tail of DBH and crown width data is longer.It shows the distribution characteristics of left deviation;the branch angle data showed multi peak shape;there is a strong positive correlation between height and DBH,DBH and crown width,but a weak positive correlation between height and crown width,crown width and branching angle,but no correlation between height and branching angle,DBH and branching angle;the cluster results are dominated by the indexes of crown width and DBH,especially by the indexes of crown width,the samples of Populus euphratica could be clearly divided into three categories,namely“large Populus euphratica”,“medium Populus euphratica”and“small Populus euphratica”.