摘要
本文以加杨（ＰｏｐｕｌｕｓＣａｎａｄｅｎｓｉｓ），Ｉ－２１４（Ｐｏｐｕｌｕｓｅｕｒａｍｅｒｉｃａｎａ（Ｄｏｄｅ）Ｇｕｉｎｉ－ｅｒＣＶ－２１４），中保１４等杨树密度试验（１９８８－１９９１）为依据，分析了初植密度、竞争对生长的抑制作用，阐述了合理密度、合理密度范围、缓冲作用、上限合理密度线的形成过程。指出在双对数图上，上限合理密度线遵从Ｌｏｇｉｓｔｉｃ分布，呈左侧伸展的Ｓ型曲线。孩曲线可划分为近似于ｌｎｗ－ｌｎＮ直线的上中下三部分，其中间部分直线式的斜率为－１．５左右，称作合理密度直线式。对密度与生长的动态作了分析、概述与讨论。
Based on the results of density experiments involving Populus canadnesis,P. euramericana Guinie cv-214 and Zhongbao 14 which were carried out from 1988 to 1991, the effects of initial density of a stand and competition among individual trees are analyzed in thiepaper.The reasonable density,buffering effect,range of reasonable density and line of reasonable density of upper limit are also presented.Meanwhile,we find that the distribution of reasona-ble density of upper limit on the figure of double logarithm abides by logisticdistribution moded. This distribution curve shows a reversed ‘S’ shape. This curve can be divide into upper, middle and lower regions,all of which are roughly the same as ln(w)-ln(N)line.In the middle of the curve,its slope is about -1.5;and this is taken as the re-asonable density line of upper limit.Finally,the dynamics of density and growth of a stand are summarized and discussed
出处
《植物生态学报》
CAS
CSCD
北大核心
1994年第2期177-183,共7页
Chinese Journal of Plant Ecology
基金
七.五国家自然科学基金会资助
关键词
密度
生长
竞争
合理密度
杨属
Density
Growth
Competition
Reasonable density
Buffe-ring effect
Line of reasonable density of upper limit
