东北红豆杉不同生境群落种间关联性

Interspecific association of different communities in Taxus cuspidata Sieb.et Zucc.habitat

本研究在吉林省汪清县杜荒子林场东北红豆杉(Taxus cuspidata Sieb.et Zucc.)集中分布区进行调查,基于方差比率(VR)、Ochiai指数(OI)以及Spearman秩相关系数检验,对云冷杉林(群落1)、云冷杉林(群落2)和风桦林(群落3)等3个群落进行了种间关联性分析。结果显示:3个群落的方差比率VR均小于1,其中3号群落主要物种总体呈显著负关联,而其他两个群落呈不显著负关联;OI分析结果表明1号和2号群落的高关联度(0.6<OI≤1)物种对比3号群落的占比更高,东北红豆杉与主要树种的平均OI从1号到3号群落依次降低;Spearman秩相关系数检验结果发现大部分物种间相关性不显著,只有1号群落的正负关联比大于1;云冷杉林物种间的总体联结度较为紧密,稳定性也较高,而风桦林的情况与此相反。

This study investigated the concentrated distribution area of Taxus cuspidata Sieb.et Zucc.in Duhuangzi forest farm,Wangqing County,Jilin Province,China.Based on variance ratio(VR),Ochiai index(OI),and Spearman rank correlation coefficients,the interspecific associations of three communities were analyzed,including spruce-fir forest(community 1),spruce-fir forest(community 2),and birch forest(community 3).Results showed that the VR values of the three communities were all less than 1,and the main species in community 3 showed a significant negative correlation,while the other two communities showed no significant negative correlation.Based on OI,the species with high correlation(0.6<OI≤1)in communities 1 and 2 accounted for a higher proportion than that in community 3.Average OI between T.cuspidata and major tree species decreased from community 1 to 3.Based on Spearman rank correlation coefficients,most species showed no significant correlation.Only the positive and negative correlation ratio of community 1 was greater than 1.The overall association between species in the spruce-fir forest was relatively close and stability was high,while the situation in the birch forest showed the opposite pattern.