防城金花茶国家级自然保护区常绿季雨林乔木层种间联结研究

Study on the Interspecific Associations in Arbor Layer of Evergreen Monsoon Rainforest in Fangcheng Golden Camellia National Nature Reserve

  • 摘要: 采用方差比率、χ2检验、AC指数、Pearson相关、Spearman秩相关系数检验,结合PCA排序和采用M.Godron群落稳定分析方法,对群落中的16个乔木层优势种进行种间联结分析、生态种组划分和群落稳定性评估,揭示防城金花茶国家级自然保护区内常绿季雨林群落的种间关系及其群落稳定性。结果表明:乔木层优势种的总体关联性呈不显著负联结,群落整体结构松散; χ2检验显示正负联结比出现异常,显著率为1.6%;AC指数的正负联结比为0.125,但显著率偏大,为了更全面准确地判定群落的种间关联性应结合χ2检验和AC指数等方法进行综合量化; Pearson相关和Spearman秩相关系数检验结果较一致,即种间关系均以负相关为主,正负相关比皆较低,显著率都较小;PCA将16个乔木层优势种划分为3个生态种组,推测第1生态种组多为演替早期喜光喜温、耐阴耐旱瘠的先锋树种,第2生态种组多为演替中期喜温暖湿润气候的常绿物种,第3生态种组均为演替后期喜光喜湿的常绿物种;M.Godron稳定性结果显示交点值为(30.93, 69.07),表明群落处于不稳定阶段,且为不稳定的演替中后期。

     

    Abstract: To reveal interspecific relationships within the evergreen monsoon rainforest communities and explore their community stability in Fangchenggang Golden Camellia National Nature Reserve, this study employed Variance Ratio(VR), χ2 test, AC index, Pearson correlation, and Spearman rank correlation coefficient. Additionally, PCA sequencing and the M. Godron community stability analysis method were utilized for interspecific association analysis, ecological species group classification, and community stability assessment of the 16 dominant tree species in the community. The findings are summarized as follows: The overall correlation among dominant species in the tree layer was not significantly negative, indicating a relatively loose community structure. The χ2 test shows that the positive and negative connection ratio is abnormal, and the significant rate is 1.6%. The positive and negative connection ratio of AC index is 0.125, but the significant rate is large. In order to determine the interspecific association of the community more comprehensively, the comprehensive quantification should be combined with χ2 test and AC index. The results of both Pearson correlation and Spearman rank correlation coefficient tests were consistent, that is, the interspecific relationship is mainly negative correlation, the positive and negative correlation is low, and the significant rate is small. Principal Component Analysis(PCA) categorized the 16 dominant tree layer species into 3 ecological species groups. It is estimated that the first ecological species group is mostly pioneer species that liked light in the early succession and drought tolerance, the second ecological species group is evergreen species with warm and humid climate in the middle succession, and the third ecological species group is evergreen species that like light and humidity in the late succession. The intersection value of the M.Godron stability results is(30.93, 69.07), indicating that the community is in an unstable phase and is in the middle and late period of unstable succession.

     

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