杉木人工林生长对密度效应的响应  

Growth response of planted Cunninghamia lanceolata stands to competition-density effect

作　　者：王艳霞[1] 吴承祯[1] 洪伟[1] 洪滔[1] 范海兰[1] 宋萍[1] 

机构地区：[1]福建农林大学林学院森林生态研究所,福建福州350002

出　　处：《福建林学院学报》2007年第1期25-29,共5页Journal of Fujian College of Forestry

基　　金：福建省自然科学基金资助项目(B0410019);福建省重大自然科学基金资助项目(2001F007)

摘　　要：用改进单纯形法优化竞争密度效应倒数式系数,并对杉木的生长过程进行了分析。结果表明,杉木人工林各生长阶段的平均单株材积和密度的观察值符合竞争密度效应曲线关系,从8年生后,随着密度的增加,平均单株材积逐步降低;随着时间的推移,生长系数逐渐降低,且竞争密度曲线逐渐向上移动。生物时间随着物理时间的增加而增加,并趋向于最大值;倒数式中的系数A和B均呈下降趋势。The reciprocal equation of the competition-density（C-D） effect （ 1/w = Ap ＋ B, where w and p respectively represent mean stem volume and stand density, A and B are coefficients） was used to analyze the C-D effect of Cunninghamia latweolata stands. The coefficients A and B were calculated by modified simplex method. The data observed from different growth stages well fitted with the C-D curve given by the reciprocal equation of the effect, and from 8 years old, mean stem volume decreased gradually with the increasing of density. Over time, the C-D curve shifted upward and the growth coefficient decreased gradually. The change trends of biological time（τ） and the coefficients A and B were achieved. τ increased gradually with physical time（t）. With τ increasing, the coefficient A decreased gradually, and approached a constant, whearas B decreased exponentially and approached zero.

关 键 词：杉木 竞争密度效应 倒数式 改进单纯形法 

分 类 号：S791.27[农业科学—林木遗传育种]