太白山独叶草及其伴生种的种间关联研究

Studies on the Interspecific Association among the Kingdonia uniflora and Its Companion Species in Taibai Mt.

基于2×2列联表,通过一系列种间关联测定方法[方差比率(variance ratio)法检验多物种间总体关联性,X2检验各种对之间的关联性,关联指数(Ochiai,Dice,Jaccard)测度各种对之间的关联程度]对太白山独叶草及16种伴生植物,共136个种对的种间关联分别进行检验与测度。结果表明:独叶草及其伴生种的总体关联表现为显著正关联,17个种对呈极显著正关联(p<0.01),6个种对表现为显著正关联(p<0.05),6个种对呈极显著负关联(p<0.01),3个种对表现为显著负关联(p<0.05)。多数种对关联程度较低,仅有7个种对正关联Ochiai指数高于0.5,说明物种各自趋于独立。这种"松散"的状况可能与群落的发展阶段和物种的生态学特性有关。

Kingdonia uniflora is one kind of the endemic species in China.Based upon a 2×2 contingency table,a series of techniques including analysis of variance ratio for testing the overall association of all species,X^2-test for testing the property of the interspecific association and association indices（Ochiai,Dice,Jaccard） for showing relationship degree of the interspecific association,were used to determine and measure the interspecific association among the 136 species-pair of Kingdonia uniflora and its 16 compa-nion species.The results indicated that the overall association of all species is significantly positive.All species-pair were checked by X^2-test,in which 17 species-pair were observed to have very significant positive association at 0.01,6 species-pair at 0.05 and 6 species-pair revealed very significant negative association at 0.01,3 species-pair at 0.05.All species-pair were also checked by Ochiai index,majorities of species-pair were lower,and just 7 positive association species-pair overtop 0.5.These reflect the independence of species-pair.The loose interspecific association is possibly related to the development stage of communities and ecological features of species.