吊罗山石碌含笑群落木本植物种间联结性研究

Interspecific Association of Woody Plants in Michelia shiluensis Community, Diaoluoshan Nature Reserve, Hainan Province

石碌含笑(Michelia shiluensis)是海南特有树种和国家Ⅱ级濒危保护植物,野外仅见分布于吊罗山、鹦哥岭、五指山等海南中南部山区。吊罗山是石碌含笑最集中的自然分布区,开展吊罗山石碌含笑群落木本植物种间联结性研究,有助于了解该树种在群落中的地位与作用,为制定合理的就地保护措施提供参考。本研究基于2×2列联表,综合运用χ^(2)检验、Pearson相关系数检验和Spearman秩相关系数检验对吊罗山石碌含笑与群落内其他伴生种的种间关系进行了探讨分析。结果表明:石碌含笑种群与灌木层的正关联比乔木层多;石碌含笑与群落内绝大多数植物的种间联结不显著,种间关系表现出总体比较松散的趋势,种群间相互独立的趋势明显,乔木层和灌木层总体上与石碌含笑正关联物种多于负关联物种数,表明群落的发展朝着有益于石碌含笑种群发育的趋势。研究结果对制定合理的就地保护措施和恢复计划具有参考价值。

Michelia shiluensis is one of the endemic plants and national class II endangered protected species in Hainan Island. It has a sporadic distribution in central and southern mountains of Hainan Island, including Diaoluoshan Mountain, Yinggeling Mountainand, Wuzhi Mountain, etc. Diaoluoshan Nature Reserve is the most concentrated distribution area of M. Shiluensis. Study on the interspecific association of woody plants in M. shiluensis community in Diaoluoshan Nature Reserve and analysis of its status in the community is of great significance to in-situ conservation of the species.On the basis of a 2×2 contingency table, χ^(2)-test, Pearson correlation coefficient test and Spearman rank correlation coefficient test were used to analyze the interspecific relationship between M. shiluensis and other plants in the community.There were more positive correlations in the shrub layer than in the tree layer. There was no significant interspecific association between M. shiluensis and most other plants in the community, the interspecific relationship showed a relatively loose trend in general, and the trend of mutual independence among populations was obvious. The tree layer and shrub layer were generally more positively associated with M. shiluensis, indicating that the development of the community was beneficial to the development of the M. shiluensis population.