青岛四个阔叶树种立木结构特征分析

Analysis on standing structure characteristics of four broad-leaved tree species in Qingdao

立木结构作为森林结构的重要指标,在森林资源调查监测方面的作用日益明显。毛白杨、国槐、三球悬铃木、白蜡是区域造林和城市绿化的重要树种,但其立木结构方面缺乏深入细化的研究。选用该四个树种为研究对象,主要在城阳区选取样地,系统分析了其树高(H)、胸径(D1.3)、地径(D0)、距地表10cm处直径(D0.1)之间的关系。根据测算结果可知:(1)四个树种H与D1.3之间基本成二次线性关系,国槐较其他树种相关性较强;(2)四个树种D1.3、D0、D0.1三者之间皆呈现较强的一次线性关系。通过数据的分析得出其校正决定系数,均能表现出较强的相关性,研究成果为林业生产、森林经理提供重要参考依据。

Standing tree structure is an important index of forest structure,and it plays an important role in forest resource survey and monitoring.Populus tomentosa,Sophora japonica,Platanus orientalis,Fraxinus chinensis are essential broadleaved tree species in regional afforestation and urban landscape greening.However,little attention has been paid to the standing tree structure for these four broadleaved tree species.This study selects the four tree species,which are distributed mainly in urban and suburban of Chengyang District,as the research object.Based on systematic investigations,an in-depth analysis was conducted to explore the correlation among tree height(H),diameter at breast height(D1.3),basal diameter(D0),diameter at 10 cm height(D0.1).The results showed that:(1)H and D1.3 for the four tree species presented a quadratic linear relationship,and the Sophora japonica has a more significant correlation than the other three tree species.(2)D1.3,D0,and D0.1 for the four species presented a clearly linear relationship.Based on the data analysis,the conclusion is that the determination coefficient can show stronger correlations,and provide an important theoretical basis for forestry production and forest management.