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中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (1): 17-23.doi: 10.11924/j.issn.1000-6850.2011-1943

所属专题： 农业生态

• 林学 园艺 园林 • 上一篇    下一篇

贵州雷公山秃杉优势种群的生态位特征

赵峰   

  • 收稿日期:2011-07-01 修回日期:2011-09-14 出版日期:2012-01-05 发布日期:2012-01-05

Niche Characteristics of Dominant Populations in Taiwania flousiana Community in Leigong Mountain, Guizhou

  • Received:2011-07-01 Revised:2011-09-14 Online:2012-01-05 Published:2012-01-05

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摘要：

为了研究贵州雷公山秃杉优势种群的生态位特征，以求更好地保护此珍稀濒危植物，采用生态位宽度和生态位重叠探讨贵州雷公山秃杉群落优势种群的生态位特征。结果表明：（1）生态位宽度大的优势种群与其他种群之间，以及生态位宽度相近的种群之间的生态位重叠值大，其他种群对生态位宽度大的种群的生态位重叠值不一定大；（2）优势种之间由于存在资源竞争，它们之间的生态位重叠大，导致群落组成和结构发生变化从而影响群落的演替方向；（3）从林下层至立木层，相同物种对的生态位重叠值降低。雷公山秃杉种群与立木层中生性植物的生态位重叠大，由于植株高度的差异，它们之间可能存在促进关系而非竞争关系。因此，调整群落结构，使之朝着中生性树种为优势种的方向发展可能对秃杉的恢复有利。

关键词: 相思拟木蠹蛾, 相思拟木蠹蛾, 调查, 空间格局, 最适抽样, 序贯抽样

Abstract:

In order to study the niche characteristics of dominant population in Taiwania flousiana community in Leigong Mountain, Guizhou, and preserve the rare and endanged plant effectively, the study aimed to analyze the niche characteristics of dominant populations in Taiwania flousiana community in Leigong Mountain by calculating niche breadth and niche overlape. The results showed that: (1) there was a large niche overlap between the populations with wide niche breadth and other populations and the populations with similar niche breadth ,whereas there was not necessarily a large niche overlap between other populations with the populations with wide niche breadth; (2) There was a large niche overlap between dominant populations because of resource competition, and this would cause the changes of community composition and structure, and thus, affect the development of the community; (3) The niche overlap between two same populations decreased from understory layer to stand canopy. All in all, the large niche overlap between Taiwania flousiana population and mesophilous dominant populations indicated that there was a promotion between them,and no competition existed due to the difference of their plant height. Therefore, it may be helpful for recovering and developing Taiwania flousiana population to rebuild the composition of Taiwania flousiana community and make the mesophilous populations become dominant ones.