阿丁枫人工林生长规律与林下植被多样性探究

采用林分调查和树干解析法,研究广西阿丁枫人工林生长规律及林木生长与林下植被多样性的关系。结果表明:30 a生阿丁枫人工林胸径、树高以及材积生长量分别为30.1 cm、24.5 m、0.61174 m^3,6~26 a为胸径和树高的快速生长期,材积的连年生长曲线与平均生长曲线在接近30 a时相交,初步判定阿丁枫材积数量成熟期为30 a;胸径、树高、材积与树龄的拟合模型相关系数均达到0.99以上,胸径最优回归模型为理查德模型,树高最优模型为苏马克模型,材积最优模型是坎派兹方程。林下植被共48种,灌木层物种丰富度优于草本层。灰色关联度显示:Margalef丰富度指数、Simpson优势度指数、Pielou均匀度指数和Shannon-Wiener指数与胸径、树高、单株材积的关联度变化规律一致,Margalef丰富度指数、Simpson优势度指数、Pielou均匀度指数均与树高的关联度最大,Shannon-Wiener指数与单株材积的关联度最大。

Growth Rule and Undergrowth Vegetation Diversity of Altingia chinensis Plantation

The growth rule and undergrowth vegetation diversity of the Altingia chinensis plantation in Guangxi was analyzed by means of stand investigation and standard tree trunk analysis.The results showed that the DBH,tree height and volume growth of 30-year-old Altingia chinensis plantation were 30.1 cm,24.5 m and 0.61174 m^3,respectively.6~26 a was the rapid growth period of DBH and tree height,and the successive growth curve of volume intersected with the average growth curve nearly 30 a,so it was preliminarily determined that the volume of Altingia chinensis was mature for 30 a.The correlation coefficients of growth model fitting were 0.99 above.The optimal growth models for DBH,height and volume were Richards equation,Schumacher equation and Gompertz equation,respectively.There were 48 species of undergrowth vegetation,and the species in shrub layer was better than that in shrub layer.The grey correlation degree showed that the four indexes had the same change rule of the correlation degree,among which Margalef richness index,Simpson dominance index and Pielou evenness index all had the greatest correlation degree with tree height,while Shannon-Wiener index had the greatest correlation degree with individual volume.