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Chinese Journal of Applied Ecology
2001,12
(2)
171-174
杉木竞争密度效果分析
作 者：
薛立;萩原秋男
单 位：
琉球大学理学部;华南农业大学林学院
关键词：
C-D效果;倒数式;杉木
摘 要：
用竞争密度 (C D)效果的倒数式分析了杉木的生长过程 .随着时间的推移 ,C D曲线在双对数图上向上移动 .随着物理时间t的增加 ,生物时间τ(τ被定义为逻辑斯蒂生长曲线中生长系数λ(t)的积分 )倾向于增加到最大值 .C D效果倒数式中的系数A和B被求出 .随着生物时间τ的增加 ,系数A急剧增加到最大值后下降 ,倾向于稳定在一个常数 ,而系数B呈指数下降 ,倾向于接近零 .随着林分的生长 ,生长系数λ(t)倾向于下降 .
译 名：
Growth analysis on the competition-density effect in Cunninghamia lanceolata stands.
作 者：
XUE Li ( College of Forestry, South China Agricultural Univiversity, Guangzhou 510642) and HAGIHARA Akio ( Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus,Okinawa 903 0213, Japan).
关键词：
C D effect, Reciprocal equation, Cunninghamia lanceolata.
摘 要：
The competition density (C D) effect in Cunninghamia lanceolata stands was analyzed by using the reciprocal equation 1/ w=Aρ+B , where w and ρ represent mean stem volume and density,respectively,the C D curve given by the reciprocal equation on logarithmic coordinates shifted upward with time.With the increase of physical time t the biological time τ defined as the integral of λ(t) ,the growth coefficient in general logistic growth curve,tended to increase to the maximum.The coefficients A and B included in the reciprocal equation were calculated at each growth stage. With increasing τ , the coefficient A increased abruptly up to a maximum value,and then tended to decrease gradually to a constant level, whereas the coefficient B decreased exponentially,and tended to close to zero. The coefficient of growth λ(t) decreased with increasing stand age.
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