杉木-观光木人工混交林竞争及邻体干扰指数研究

Competition and Neighborhood Interference Index of Cunninghamia lanceolata Plantation Mixed with Tsoongiodendron odrum

将杉木和观光木人工混交林中林木竞争影响空间划分为内、外两圈,在此基础上将竞争指数分解为不同的邻体干扰指数,对象木生长量与3种干扰指数的回归分析表明,以杉木为对象木时,利用张大勇提出的干扰指数模型(Izdy)效果最好;以观光木为对象木时,利用Weiner提出的干扰指数模型(Iwg)效果最好.同时,竞争强度研究表明,杉木种内竞争>杉木观光种间竞争>观光木种内竞争.通过对几种竞争影响的划分比较,说明将竞争空间分为内、外两圈能较好地反应林木的竞争规律.

The competition influence zone of Cunninghamia lanceolata （ Lamb. ） Hook plantation mixed with Tsoongiodendron odrum Chun was divided into two parts： one was defined as inside radius, and the other as outside radius. Base on this, the competition index could be decomposed into different neighborhood interference indexes. The regression analysis of objective tree＇s growth and three kinds of interference indexes was studied. The results showed that if the objective tree was C. lanceolata, Zhang Dayong＇s interference index model could obtain the best result, while if the objective tree was T. odrum, Weiner＇s model was better comparing with the other competition models. The study still showed that the intraspecific competition of C. lanceolata 〉 the interspecific competition of C lanceolata and T. odrum 〉 the intraspecific competition of T. odrum. The comparison of different kinds of competition influence division indicated the model that divided the competition zone into two parts could show the competition rules accurately. Tab 3, Ref 17