不同坡位乳源木莲幼树的年生长动态和生长节律  

The Annual Growth Dynamics and Growth Rhythm of Manglietia yuyuanensis Saplings at Different Slope Positions

作　　者：欧建德 康永武 Ou Jiande;Kang Yongwu(Mingxi Forestry Bureau,Sanming·Fujian 365200,P.R.China;Shaxian Forestry Bureau)

机构地区：[1]明溪县林业局,福建三明365200 [2]沙县林业局

出　　处：《东北林业大学学报》2024年第9期8-12,18,共6页Journal of Northeast Forestry University

基　　金：中央财政林业科技推广项目(标准化示范(2014)2号);2023年度三明市专家“一带一”培养项目。

摘　　要：分析乳源木莲(Manglietia yuyuanensis)幼树的年生长动态与生长节律的坡位效应,揭示坡位作用年生长量的生长节律路径。以不同坡位乳源木莲幼树为研究对象,采用定株观测,应用Logistic方程拟合树高、胸径、材积年生长动态的方法,分析年生长动态与生长节律的坡位效应;利用通径分析的方法明确年生长量与节律因子之间关系,揭示坡位影响生长的生长节律实现路径。结果表明:乳源木莲幼树树高、胸径、材积的年生长,随着坡位下移而持续显著增大,生长的坡位效应随时间推移而愈加显现。坡位显著影响树高、胸径、材积生长的线性生长始期、终期、持续时间及其速率、最大线性生长速率、线性生长量等生长节律因子,且均表现出随着坡位下移而持续增大的变化趋势。线性生长速率对树高、胸径、材积的年生长量有显著直接作用;线性生长持续时间对胸径的年生长量有显著直接作用,但对树高、材积的年生长量无显著直接作用;线性生长始期对树高、胸径、材积的年生长量均无显著直接作用。生长节律因子在乳源木莲幼树年生长量的相对重要性由大到小依次为线性生长速率、线性生长持续时间、线性生长始期,其中线性生长速率是主导因子。坡位显著影响乳源木莲树高、胸径、材积的生长动态,坡位对生长影响是个动态过程。采用Logistic方程能够很好地拟合乳源木莲幼树生长过程。坡位显著改变了乳源木莲幼树的树高、胸径、材积的生长节律。坡位影响树高、材积的年生长量,主要通过改变线性生长速率来实现。坡位影响胸径的年生长量主要是通过改变线性生长速率、线性生长持续时间来实现。The study aims to analyze the slope position effects on the annual growth dynamics and growth rhythm of Manglietia yuyuanensis saplings,and to reveal the slope position effects on the growth rhythm pathway of annual growth volume.Different slope positions of M.yuyuanensis saplings were studied using fixed-point observations,and the Logistic equation was applied to fit the annual growth dynamics of tree height,diameter at breast height,and wood volume.The slope position effects on the annual growth dynamics and growth rhythm were analyzed.Path analysis was used to clarify the relationship between annual growth volume and rhythm factors,and to reveal the pathway of slope position effects on growth rhythm.The results showed that the annual growth of tree height,diameter at breast height,and wood volume of M.yuyuanensis saplings significantly increased as the slope position descended,and the slope position effects on growth became more evident over time.The slope position significantly affected the linear growth onset,termination,duration and rate,maximum linear growth rate,and linear growth volume of tree height,diameter at breast height,and wood volume,showing a continuous increase with descending slope position.Linear growth rate had a significant direct effect on the annual growth volume of tree height,diameter at breast height,and wood volume,whereas linear growth duration had a significant direct effect only on the annual growth volume of diameter at breast height.Linear growth onset had no significant direct effect on the annual growth volume of tree height,diameter at breast height,and wood volume.The relative importance of growth rhythm factors in the annual growth volume of M.yuyuanensis saplings was ranked from highest to lowest as follows:linear growth rate,linear growth duration,and linear growth onset,with the linear growth rate being the dominant factor.The slope position significantly affected the growth dynamics of tree height,diameter at breast height,and wood volume of M.yuyuanensis saplings,and th

关 键 词：乳源木莲 坡位 生长节律 关系 通径分析 

分 类 号：S727.1[农业科学—林木遗传育种] S792.99[农业科学—林学]