尖峰岭杉木人工林群落主要木本植物的生态位和种间联结OA北大核心CSTPCDMEDLINE

Studies on niche and interspecific association can reveal plant interspecific relationship in the communi-ty,and provide theoretical support for promoting the transformation and development of plantation to natural forest.Based on Cunninghamia lanceolata investigation data of permanent plots of plantation in Jianfengling area of Hainan Tropical Rainforest National Park,we analyzed niche and interspecific association of the top 20 woody species in the community according to their importance values.The results showed that there were 163 species of woody spe-cies belonging to 101 genera and 55 families in the C.lanceolata plantation community,with complex species com-position.As a constructive species,C.lanceolata had the highest importance value and niche breadth,and thus was the absolute dominant species in the community.It had a large niche overlap and niche similarity with many other species,among which the highest was observed in Adinandra hainanensis.The average niche overlap and niche sim-ilarity of the community were 0.54 and 0.49,respectively.The change trends of those two niche indicators were ba-sically the same,indicating that some species were similar in resource demands.The overall association of main woody species was significantly positive.The x2 test,association coefficient,Pearson correlation coefficient,and Spearman rank correlation coefficient suggested that the amounts of pairs with positive association were more than that with negative ones.The proportion of significant association species pairs was relatively low,indicating that the community stability was strong,species could coexist stably,and most species did not form close ties.On the whole,C.lanceolata had inhibited the regeneration of original tree species,and A.hainanensis,Garcinia oblongifo-lia,and Heptapleurum heptaphyllum could be used in natural transformation and restoration of C.lanceolata planta-tion in the Hainan Tropical Rainforest National Park.