海南霸王岭油丹所在群落的优势种群种间联结性研究

基于2×2联列表，以X2统计量、Ochiai联结测度指数和多物种关联指数为参数，分析了海南霸王岭油丹所在群落中油丹(Alseodaphne hainanensis)等17个主要种群(物种)的种间联结性特征。结果表明, 17个主要种群(物种)总体水平上表现为不显著的正联结。17个物种组成的136个种对中：当取样面积在100 m2时，有72对表现正关联，63对为负关联，1对无关联。X2检验有2对表现显著正关联，有3对表现显著或极显著负关联。有125个种对的0＜OI＜0.6，仅有9个种对的OI≥0.6, 另有2个种对OI=0；当取样面积为50 m2时，有59对表现正关联，70对为负关联，7对无关联。X2检验有6对表现显著或极显著正关联，有2对表现显著负关联。有129个种对的0＜OI＜0.6，而OI≥0.6的种对没有, 另有7个种对OI=0。不同优势种群下的种间联结性存在一定的差异，而以线枝蒲桃(Syzygium araiocladum)等为优势种群的群落种间联结性较高，群落结构较稳定。

Interspecific Associations among Dominant Populations in the Communities with Alseodaphne hainanensis in Bawangling, Hainan Island

Based on the 2×2 contingency table, a series of parameters, including X2-test, Ochiai values (OI) and correlation index were used to analyze the characteristics of interspecific associations among 17 dominant populations in the communities with Alseodaphne hainanensis in Bawangling, Hainan Island. The results showed that the interspecific associations among 17 dominant populations were not significantly positive correlation. The 136 species pairs at all were consisted of 17 dominant populations. When the sampling area was 100 m2, 72 species pairs had positive correlation, 63 species pairs negative correlation, and 1 species pairs no correlation. The X2-test indicated that 2 species pairs had significantly positive correlation and 3 species pairs had significantly or very significantly negative correlation. The Ochiai value (OI) of 125 species pairs ranged from 0 to 0.6, 9 species pairs were greater than or equal to 0.6, and 2 species pairs were 0. When the sampling area was 50 m2, 59 species pairs had positive correlation, 70 species pairs negative correlation, and 7 species pairs no correlation. The X2-test indicated that 6 species pairs had significantly positive correlation, and 2 species pairs had significantly negative correlation. The OI of 129 species pairs ranged frome 0 to 0.6, and the others 7 species pairs were 0. There were differences in interspecific association among communities with different dominant populations, but the interspecific associations in community with Syzygium araiocladum as dominant population were stronger than those in other communities, it reflected that the community was stable.