黔中喀斯特区不同光环境下光皮桦枝叶关系特征研究

Study on the Characteristics of Relationship Between Branches and Leaves of Betula Luminifera under Different Light Conditions in KarstArea of Central Guizhou

以3种不同光环境下(孤立木、林缘木、林中木)的光皮桦作为研究对象,研究分析了不同光环境下光皮桦的林木枝叶鲜重、生物量、枝体积、枝横截面积等植物枝叶性状权衡关系特征。结果表明:1)在平均枝-叶所含生物量上,孤立木>林缘木>林中木。2)孤立木由于得到更加充足的光照条件,枝-叶大小数量关系特征比更加接近预期估计数值,其次是林缘木、林中木。3)枝条大小(枝鲜重、枝横截面积、枝体积)和其支撑的叶大小(叶鲜重、鲜叶总面积)具有显著正相关关系,当年生枝叶基本接近于等速生长;但是在枝大小一定情况下,枝条的分级越多,分级枝上的叶量越少。

In this paper,the balance relationship between branches and leaves traits of Betula luminifera,such as fresh weight,biomass,volume and cross-sectional area under three different light environments (isolated trees,edge trees and in-Forest trees) were studied.The results showed that: 1) On the average biomass of branches and leaves,isolated trees > edge trees > in-Forest trees.2) Because of more sufficient illumination conditions,the size-quantity relationship between branch and leaf of isolated trees was closer to the expected estimates,followed by edge trees and in-Forest trees.3) Branch size (branch fresh weight,cross-sectional area,branch volume) has a significant positive correlation with its supported leaf size (leaf fresh weight,total area of fresh leaves),the one-year growth of branches and leaves was nearly equal;But under fixed branch size,the more branches were graded,the less leaves were on the graded branches.