3种典型立地荆条种群及种间分布的空间点格局

Point pattern analysis for relationships of Vitex negundo var. heterophylla in three typical stands

为了明确荆条Vitex negundo var.heterophylla群落种群及种间特征,以空间点格局分析法对3种典型立地的荆条及种间空间格局进行分析。结果表明:荆条空间分布格局整体为随机分布,油松Pinus tabulaeformis林立地部分尺度下为集群分布;在99%的置信区间下,荆条与细叶小檗Berberis poiretii,小叶鼠李Rhamnus parvifolia,酸枣Ziziphus jujuba var.spinosa,臭椿Ailanthus altissima和油松种间格局相关关系不显著,在样地中可以长期共存;荆条与胡枝子Lespedeza bicolor,太平花Philadelphus pekinensis,叶底珠Securinega suffruticosa和三裂绣线菊Spiraeatrilobata在小尺度下为正相关、互利共存;随着尺度变大,荆条与胡枝子、三裂绣线菊为极显著的负相关关系(P<0.01),竞争生存空间;并提出水源涵养林营造生物多样性配置建议。

To determine community characteristics of Vitex negundo var.heterophylla,plant material from three types of typical sites were selected and studied with a 99% confidence interval from a point pattern analysis and with a correlation analysis.Results showed that the V.negundo var.heterophylla population spread stochastically over different stands,except for the Pinus tabulaeformis stand.V.negundo var.heterophylla, was not significantly correlated with Berberis poiretii,Rhamnus parvifolia,Ziziphus jujuba var.spinosa, Ailanthus altissima,and P.tabuliformis.Using a small-scale investigation,V.negundo var.heterophylla was significantly（P = 99%） and positively correlated with Lespedeza bicolor（r＆lt;2.8）,Philadelphus pekinensis（1.1＆lt;r＆lt;2.6）,Securinega suffruticosa（1.9＆lt;r＆lt;4.2）,and Spiraea trilobata（0.8＆lt;r＆lt;1.9）.With a large-scale analysis,V.negundo var.heterophylla had a negative influence on L.bicolor and S.trilobata.Thus,long-term coexistence with V.negundo var.heterophylla was possible for the plant communities above that showed no significant relationship,but V.negundo var.heterophylla would compete for living space with L.bicolor and S. trilobata.