不同混交模式对柳杉幼林生长的影响及竞争关系研究  

The Effect of Different Mixture Models on Tree Growth and Competition Relations of Yang Stand of Cryptomeria fortunei

作　　者：王世平[1] 夏玉芳[1] 田海峰 张友元[1] 杨再祥 

机构地区：[1]贵州大学林学院,贵州贵阳550025 [2]思南县水利局,565100 [3]浙江汉蓝环境科技有限公司,310020

出　　处：《贵州林业科技》2008年第2期13-16,64,共5页Guizhou Forestry Science and Technology

摘　　要：本文对不同混交模式的土壤物理性质、林分生长状况和林木竞争对柳杉幼林生长的影响进行分析,结果表明:柳杉幼林阶段刺槐与柳杉混交模式对柳杉幼林生长的影响要比其他几种模式要小。不同混交模式林分竞争指数的大小顺序为:纯林柳杉>柳杉与滇柏混交模式>柳杉与桦木混交模式>柳杉与刺槐混交模式>柳杉与漆树混交模式。通过幂函数C I=ADB预测柳杉-刺槐混交模式中,柳杉个体胸径与竞争的关系,柳杉种内及柳杉-刺槐种间竞争的内外圈竞争指数总趋势是随着对象木的胸径增大而减小,当对象木的胸径达到20 cm后,竞争指数变化不大,因此要获得高产量的柳杉木材,在柳杉个体胸径达到20 cm之前,必须进行人工抚育,以利于柳杉个体的生长发育。The effect of different mixture models of Cryptomeria fortunei young stands on the tree growth was studied, based on the analysis of the soil physical property, stand growth status and the intraspecific ＆ interspecific competition in different mixture models. The result showed that Robinia pseucdoacacia×Cryptomeria fortunei mixture model had the least impact on the tree growth of Cryptomeria fortunei. The competition indexes of different mixture models were in order of Pure Cryptomeria stand 〉 Cryptomeria and Yunnan Bai mixed stand 〉 The cryptomeria and the white birch mixed stand 〉 The cryptomefia and the locust tree mixed stand 〉 The cryptomeria and the lacquer tree mixed stand. When analyzed with power function CI = ADB for Robinia pseucdoacacia×Cryptomeria fortunei mixture model, it was found that the intraspecific ＆ interspecific competition in the stand generally decreases with the increase of the DBH, and when the DBH 〉 20cm, the competition index varied insignificantly. Hence, it was suggested that artificial tending is needed when DBHs of the Cryptomeria fortunei young trees are below 20cm.

关 键 词：混交模式 柳杉 种内竞争 种间竞争 

分 类 号：S725.1[农业科学—林木遗传育种]