广东省九连山林场红椎林种内竞争关系研究

Study on the Intraspecies Competition Relationship of Castanopsis hystrix Forest in Jiulianshan Forest Farm of Guangdong

研究量化分析广东省九连山林场12年生红椎Castanopsis hystrix人工林内竞争关系,结果如下:1、研究区内红椎植株胸径生长符合正态分布,分布相对集中于8~10、10~12 cm径级;2、按照单木竞争指数模型计算,12 m范围为本研究最佳竞争空间;3、在径级为8~10、10~12、12~14 cm时,红椎个体受到主要的种内竞争压力,三者竞争强度之和占据全部竞争的64.8%;4、红椎胸径与平均竞争指数呈极显著的指数相关,平均竞争强度随胸径增长而下降,当胸径达到20 cm以上时,竞争指数几乎无变化。

Studying the competitive status of forest populations of rare tree species can reflect the growth of forests and their resource utilization,which is of guiding significance to the scientific operation of rare tree species.This study quantitatively analyzed the competitive relationship of the 12-year-old Castanopsis hystrix plantation in Jiulianshan Forest Farm in Guangdong province and obtained the following four results.1.The DBH growth of C.hystrix plants in the study area conformed to the normal distribution,which was relatively concentrated in the diameter classes of 8-10 and 10-12 cm.2.According to the single-wood competition index model,the range of 12 m was the best competition space in this study.3.When the diameter class is 8-10,10-12,12-14 cm,the C.hystrix individuals were subjected to the main intraspecies competition pressure,and the sum of competition intensity of the total competition accounted for 64.8%.4.There was a significant exponential correlation between the DBH of the C.hystrix and the average competition index,and The average competitive intensity decreased with the increase of DBH.When DBH reached more than 20 cm,the competition index almost had no change.