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    王鑫, 刘钦, 黄琴, 张华雨, 李宗峰, 张世强, 邓洪平. 崖柏群落优势种生态位及CCA排序分析[J]. 北京林业大学学报, 2017, 39(8): 60-67. DOI: 10.13332/j.1000-1522.20160172
    引用本文: 王鑫, 刘钦, 黄琴, 张华雨, 李宗峰, 张世强, 邓洪平. 崖柏群落优势种生态位及CCA排序分析[J]. 北京林业大学学报, 2017, 39(8): 60-67. DOI: 10.13332/j.1000-1522.20160172
    WANG Xin, LIU Qin, HUANG Qin, ZHANG Hua-yu, LI Zong-feng, ZHANG Shi-qiang, DENG Hong-ping. Niche characteristics and CCA ordination of dominant species of Thuja sutchuenensis community[J]. Journal of Beijing Forestry University, 2017, 39(8): 60-67. DOI: 10.13332/j.1000-1522.20160172
    Citation: WANG Xin, LIU Qin, HUANG Qin, ZHANG Hua-yu, LI Zong-feng, ZHANG Shi-qiang, DENG Hong-ping. Niche characteristics and CCA ordination of dominant species of Thuja sutchuenensis community[J]. Journal of Beijing Forestry University, 2017, 39(8): 60-67. DOI: 10.13332/j.1000-1522.20160172

    崖柏群落优势种生态位及CCA排序分析

    Niche characteristics and CCA ordination of dominant species of Thuja sutchuenensis community

    • 摘要: 应用Levins、MacArthur-Levins和Pearson指数法对大巴山崖柏群落中重要值排名前20位的优势乔灌木树种进行生态位宽度、生态位重叠及CCA排序研究。结果:1)崖柏为群落乔木层中优势种,其重要值最大(0.225 1),生态位最宽(6.704 2),且对其他树种的生态位重叠度较大(Oij>0.123 7),表明乔木层中的崖柏具有较强的环境适应能力、资源利用能力和竞争优势。2)崖柏在灌木层中生存状况堪忧,其重要值(0.170 1)虽排在第1位,但其生态位宽度(1.853 0)仅排在第19位,且对其他树种的生态位重叠度较小(Oij < 0.482 3),其他树种对崖柏的生态位重叠度较大,说明处于灌木层的崖柏对资源利用的竞争能力较弱。3)对乔木层优势种CCA排序可知,崖柏、小叶青冈等生态位较宽的物种多分布在排序图的中心位置,华山松、野核桃等生态位较窄的物种多位于排序图的外围。结合生态位重叠可以看出,崖柏—多脉青冈、崖柏—川柯、崖柏—四川杜鹃等生态位重叠度大的物种,在排序图中一般都相邻或相近。参与排序的9个环境因子,坡度、pH及土壤含水量对崖柏的生存有较大影响。4)生境特化、人为破坏是导致崖柏分布区狭窄、斑块化、种群更新困难和濒危的重要原因。

       

      Abstract: Using Levins, MacArthur-Levins and Pearson index methods, niche breadth, niche overlap and canonical correspondence analysis (CCA) of top 20 tree and shrub species were studied in Thuja sutchuenensis community of Dabashan Mountain, southwestern China. Results showed that:1) Thuja sutchuenensis was a dominant species in the tree layer of the community with the maximum important value (0.225 1) and niche breadth (6.704 2), and had larger niche overlap than other species (Oij>0.123 7). It indicates that Thuja sutchuenensis has stronger ability to adapt to the environment, to compete and utilize resources in the tree layer. 2) The living conditions of Thuja sutchuenensis in shrub layer was far from optimistic. Although owning the maximum important value (0.170 1), while its niche breadth only ranked 19th (1.853 0). Also, Thuja sutchuenensis had smaller niche overlap degree(Oij < 0.482 3) than other species, but the other species had larger niche overlap degree with Thuja sutchuenensis. Consequently, the Thuja sutchuenensis had a weaker competition ability in the shrub layer. 3) Based on the advantage species CCA sequences in the tree layer, species (Thuja sutchuenensis, Cyclobalanopsis myrsinifolia) with broad niche breadth distributed in the center of the sequence diagram; individuals (Pinus armandii, Juglans cathayensis) with narrow niche breadth located in the periphery of the sequence diagram. Combined with the niche overlap, those species (Thuja sutchuenensis-Cyclobalanopsis multinervis, Thuja sutchuenensis-Lithocarpus fangii, Thuja sutchuenensis-Rhododendron sutchuenense, etc.) with high niche overlap degree usually close to each other in the sequence diagram. Concerning the 9 sequencing environmental factors, slope degree, pH and soil water content had great influence on the survival of Thuja sutchuenensis. 4) Habitat specialized and artificial destruction are two significant reasons to result in the narrow distribution range, patchlized shape, population renew difficulty and endangerment of Thuja sutchuenensis.

       

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