不同林龄桉树林分结构及生物量模型研究  

Study on Stand Structure and Biomass Model of Eucalyptus at Different Ages

作　　者：蒙青松 MENG Qing-song(Guigang Qintang Forest Farm,Qintang,Guangxi 537100)

机构地区：[1]贵港市覃塘林场,广西覃塘537100

出　　处：《安徽农业科学》2024年第4期106-109,共4页Journal of Anhui Agricultural Sciences

摘　　要：为揭示不同林龄桉树(Eucalyptus robusta)林分结构特征及其生物量分配状况,采用空间代替时间法和典型抽样方法,以广西贵港市覃塘林场桉树人工林为研究对象,综合分析不同林龄期(2、4、6年生)林分结构规律与不同阶段生物量分配模型。结果表明:桉树人工林胸径与树高随林龄的增长而发生明显变化,胸径及树高的变幅随着林龄的增加也逐渐变大。随着林龄的增加径级数增加,且各径级所占比例数值均呈单峰型变化,6年生时,林分中大径级(d>20 cm)所占林分比例为55.72%,6年生桉树为适宜轮伐年限。对桉树单株不同林龄生物量进行拟合表明,多项式拟合度最优,且随着林龄的增加,总生物量的拟合精度越高,其决定系数为0.9627,6年生总生物量的拟合方程为y=-6E-07x^(2)+0.0378x-50.9930。In order to reveal the structural characteristics and biomass distribution of Eucalyptus stands at different ages,the spatial substitution time method and typical sampling method were used to comprehensively analyze the structural rules of Eucalyptus robusta plantation at different ages(2,4 and 6 years old)and biomass distribution models at different stages in Qintang Forest Farm,Guigang City,Guangxi.The results showed that the DBH and tree height of eucalyptus plantation changed significantly with the growth of forest age,and the variation range of DBH and tree height also gradually increased with the increase of forest age.With the increase of forest age,the diameter grade increases,and the proportion value of each diameter grade changes in a single peak.At the age of 6 years,the proportion of the large diameter grade(d>20 cm)in the stand is 55.72%,and the 6-year old eucalyptus is the suitable rotation age.The fitting of biomass of single eucalyptus at different forest ages showed that the polynomial fitting degree was the best,and with the increase of the forest age,the fitting accuracy of the total biomass was higher,its determination coefficient was 0.9627,and the fitting equation of the total biomass at the age of 6 years was y=-6E-07 x^(2)+0.0378x-50.9930.

关 键 词：桉树人工林 林分结构 生物量 

分 类 号：S750[农业科学—森林经理学]