马尾松香樟人工混交林中的邻体干扰效应

研究了荆界山马尾松(pinus massoniana)和香樟(Cinnamomun camphora)人工混交林中,马尾松个体生长速度与邻体效应之间的相互关系.以马尾松为基株,3m为半径圆内的个体均被定义为邻体,采取张大勇改进的干扰指数模型和马尾松的生长速度进行回归分析,发现马尾松生长速度和邻体干扰指数之间有显著的线性关系.研究结果表明,在该群落的演替过程中,香樟对马尾松以及马尾松自身对马尾松的生长均表现为竞争关系,其中马尾松的种内竞争尤为强烈.因此可以推断,此人工林群落演替的动力是马尾松各个体对资源竞争所引起的自疏作用,以及香樟与马尾松种间竞争所引起的他疏作用.马尾松种群最终将退出该群落.

THE NEIGHBORHOOD INTERFERENCE EFFECT IN THE MASSON PINE AND CAMPHORTREE MIXED ARTIFICIAL FOREST

This paper deals with the relationship between the individual growth rate and the neighborhood interference effect in the Masson Pine ( Pinus massoniana) and Camphortree ( Cinnamomum camphara) Artificially mixed forest in Jingjai Mountain. All of the trees in the circle of 3 m in radius from the object tree are considered as the neighborhood of that tree ( Pinus massoniana) . Zhang Dayong's improved Interference Index Model is used to make regression analysis between the growth rate and the neighborhood interfernce index. It demonstrates that there is a significant linear correlation between the growth rate of Masson Pine and the neighborhood interference index.The regression equation between the growth rate of Masson Pine and two parts of the inter ference index is.Y = 9.29 - 0.79/, 0.70/1 O = 0.72, p< 0.01)The resuft indicates that in the process of community succession there are not only interspecific competition between Masson Pine and Camphortree but also intraspecific competition among Masson Pine individuals, the latter is particularly intensive. As a result we can infer that the driving force of the community succession is selfthinning caused by intraspecific competition and alien-thinning by interspecific competition. At last the Masson Pine population will be eliminated through competition in the mixed forest.