毛竹竹冠结构的研究

<正> 毛竹竹冠由秆、枝、叶三部分组成。竹秆分枝部分是竹冠的支柱,竹秆上每一个分枝的节和枝、叶合称为一个枝盘。每一枝上着生主枝、侧枝、小枝,各种枝条按一定规律分布在竹秆四周,构成竹冠的空间支架。每一个叶枝上着生3—5片竹叶,均匀分布在竹冠上形成绿色的叶层,有效地利用太阳光能进行光合作用,生产有机物质。竹冠结构是指竹冠中秆、各种枝条、竹叶的数量及其在各盘枝上的分布。关于毛竹的秆形结构,作者曾作过报道,本文主要论述毛竹竹冠结构的规律性。1979年以来,我们在江苏宜兴县林场,共调查70株标准竹,每株标准竹伐倒后,记录竹龄、胸径、高度、枝下高、总节数、枝下节数、竹冠节数(枝盘数)、竹秆重量以及枝、叶重量等,并按枝盘号调查主枝、侧枝、小枝、叶枝、叶片数等。

STUDIES ON THE STRUCTURE OF BAMBOO CROWN OF PHYLLOSTACHYS PUBESCENS

This paper deals with the mathematical models of bamboo crowns of Phyllostachys pubescens. Based on seventy bamboo culms collected from Yixing Field Station, Jiang-su, eight mathematical models and twenty regression equations have been worked out by statistical procedures.For total number, length, nodes, leaves and weight of various branches in a bamboo crown, there are:Model I . T(x) = aDtxe Model I. T(x) = aDb(7-x)c and four regression equations: 1 . Total number of various branches in a bamboo crown.2 . Total length of various branches in a bamboo crown.p,. Total nodes of various branches in a bamboo crown.4 . Total weight of various branches in a bamboo crown.For the discontinuous distribution of number, length, nodes, leaves and weight of various branches at certain branched node of a culm, there are:For the cumulative distribution of number, length, nodes, leaves and weight of various branches at certain branched node of a culm, there are:Parameters, of twelve regression equations listed as follows:Main Side Small Least Weight of Weight of P. branches branches branches branches branches branchesLeaves With leavesT(x), x = 2 3 4 5 6e= 20.0 15.0 19.0 15.0 12.0 12.0f= 1.18 1.27 1.15 1.35 1.42 1.37For the component distribution of number, length, nodes, leaves and weight of various branches at certain branched node of a culm, there are. Model B: ma=T(x)Pnand four regression equations; 1 . Component distribution of number of various branches in a bamboo erown.2 . Component distribution of length of various branches in a bamboo orown.3 . Component distribution of nodes of various branches in a bamboo crown.4 . Component distribution of weight of various branches in a bamboo crown.