海南粗榧幼苗种群构件结构与环境因子的多元分析

The multivariate analysis of the modular sturcture of young tree population in Cephalotaxus mannii and the ecological factors

以构件理论为基础，运用灰色关联度分析技术对分布于海南岛5个地区的海南粗拉幼苗种群构件结构及与环境因子之间的关系进行了分析结果表明：①一级枝叶系统是海南粗榧幼苗种群构件结构的主要组成部分，二级枝叶系统等构件指标较为保守；②土壤湿度、土壤质地、群落透光度强烈影响海南粗极幼苗种群的生长，有效磷含量、海拔的作用较小；③土壤中有效钾含量对其生长的影响强于氮、磷的作用在对珍稀濒危物种海南粗榧幼苗种群的保护中，无论是就地还是迁地，应严格保证该种的阴湿生态环境及适当的土壤质地．

Based on the modular theory and with the analysis of relatedness degree adopted in the grey system theory, the correlation of the ecological factors and the modular structure of young tree population in Cephalotaxus mannii, which is distributed in five places in Hainan island China, was investigated. The resultS show ①the first grade branch-leaf sysern is a majle component, while the modular indices such as the second grade branch-leaf sysem etc. are conservertive to the changes of the ecological factors; ②the development of young C. mannii population is srongly afffected by the soil humidity, soil structure and transparence ofcommunity, on the other hand, the content of effective phosphrus in soil and elevation are not very important factors; ③the effection of the conent 0f potassium in soil on the growth of the young tree population of C. mannii is stronger than that of the content of nitrogen and phosphorus. The shady and moist habitat and the proper soil structure should be guarenteed in considering the conservation of young C. mannii population, regardless of in or ex situ conservation.