【摘要】 为了揭示秦岭南坡松栎林群落动态变化过程中物种间关系与群落演替的相互作用,基于2×2列联表,采用方差比率法、χ2检验、Jaccard指数和Spearman秩相关性系数探讨了油松林→松栎混交林→锐齿栎林演替序列过程中3个演替阶段群落优势种群的种间联结性和相关性。结果表明:(1)油松林、松栎混交林和锐齿栎林群落总体联结性均为显著正联结,各自具有相对的稳定性。(2)油松和松栎混交林群落正负联结性和相关性比例较小,群落稳定性均低于锐齿栎林群落。(3)先锋种间及其与前期过渡种间、顶级种间及其与后期过渡种间竞争较为激烈,过渡种间(包括前期过渡种间、前期过渡种与后期过渡种间、后期过渡种间)正联结占优势,较为稳定。(4)不同演替阶段群落可分别划分为4个、5个、4个生态种组。研究认为,秦岭南坡松栎混交林演替过程中种间关系逐渐趋于稳定共存,实践中及时调整种间关系可促使秦岭南坡松栎林群落趋于健康稳定,有效缩短演替的进程。更多还原

【Abstract】 To reveal the complex relationships between the characteristics of interspecific association and community succession in the succession process of pine oak forest community on the south-facing slopes in Qinling Mountain.Based on 2×2contingency tables,we used the variance ratio,χ2 test,Jaccard index and Spearman’s rank correlation coefficient to study the characteristics of interspecific association and correlation among main plant populations of different successional stages in the successive serials from Pinus tabulaeformis forest to P.tabulaeformis-Q.aliena var.acuteserrata mixed forest then to the subsequent Q.alienavar.acuteserrataforest on the south-facing slopes in Qinling Mountain.The results showed that:(1)the overall interspecific associations of dominant species in P.tabulaeformis forest,Q.aliena var.acuteserrataforest and P.tabulaeformis-Q.aliena var.acuteserrata mixed forest are significant positive connection,each community has a relative stability.(2)The positive and negative interspecific associationsand correlation percent of main species in P.tabulaeformis forest and P.tabulaeformis-Q.alienavar.acuteserrata mixed forest are smaller,and their community stability are inferior to Q.aliena var.acuteserrataforest.(3)Interspecific competitions among pioneer species,pioneer species and prior transitionary species,climax species,post transitionary species and climax species are more intense,but there are more positive connection among the transitional species(including prior transitionary species,prior transitionary species and post transitionary species,post transitionary species),and the interspecific relationship is more stable relatively.(4)The main species in different succession process of pine oak forests community are respectively divided into 4,5,4ecological groups.Above all,the interspecific relationship of main species in the succession process of pine oak forest community on the south-facing slopes in Qinling Mountains gradually become stable and concomitant.In practice,the reasonable adjustment measures of interspecific relationship can prompt the pine oak forest community on the south-facing slopes in Qinling Mountains more stable and healthier,effectively shorten the process of succession.更多还原