Intraspecific and Interspecific Competition of Ulmus lamellosa under the Condition of Different Degree of Dominance
汪生财 1邢韶华 1赵志荣 2杨军 3王葛 3崔岩 3张笑晨3
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作者信息
1. 北京林业大学 生态与自然保护学院,北京 100083
2. 北京市房山区上方山国家森林公园管理处,北京 102400
3. 北京市百花山国家级自然保护区管理处,北京 102311
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摘要
目的:脱皮榆是榆科榆属植物,主要分布在辽宁、北京、河北、河南、山西和内蒙古等省市自治区,是我国特有种.本研究分析其种内种间竞争关系以揭示群落生态适应机制.方法:研究通过 Hegyi 竞争指数分析北京市脱皮榆在不同优势度下种内种间竞争关系.结果:(1)群落优势种受到的总体竞争压力较大,优势种受到的平均竞争压力并不一定大;同样,以脱皮榆为优势种的群落中,脱皮榆受到的总体竞争压力也较大,但平均竞争指数并不大,脱皮榆受到的总体竞争强度和平均竞争强度之间并不存在确定的相关关系.(2)群落内一个物种受到的竞争压力来自种内竞争还是种间竞争与群落内物种的密度以及其分布格局有关,以脱皮榆为优势种的群落内,脱皮榆受到的种内竞争远大于种间,以其他优势种为主的群落中,脱皮榆主要受到来自种间的竞争.(3)在一定范围内,随着脱皮榆胸径的增加,受到的竞争压力逐渐减小.结论:为脱皮榆自然种群的保育、恢复和重建提供理论依据.
Abstract
Objective:Ulmus lamellosa was a member of the genus Ulmus of the family Ulmaceae,which was mainly distributed in Liaoning,Beijing,Hebei,Henan,Shanxi,and Inner Mongolia.The interspecific competition relationships of U.lamellose were analyzed to reveal the mechanisms of com-munity ecological adaptation.Methods:The Hegyi competition index was used to analyze the intraspe-cific and interspecific competition of U.lamellosa in Beijing with different dominance.Results:(1)The overall competitive pressure on the dominant species in the community was greater,and the aver-age competitive pressure on the dominant species was not necessarily large.Similarly,in the communi-ty with U.lamellosa as the dominant species,the overall competitive pressure on U.lamellosa was also greater,but the average competition index was not large.And there was no definite correlation between the overall competition intensity and the average competition intensity.(2)Whether the competition pressure on a species in the community from intraspecific competition or interspecific competition was actually related to the density of species in the community and its distribution pattern.In the community with U.lamellosa as the dominant species,the intraspecific competition of U.lamellosa was much greater than the interspecific competition.And in the community dominated by other dominant species,U.lamellosa was mainly affected by interspecific competition.(3)Within a certain range,the competi-tive pressure decreased with the increase of DBH of U.lamellosa.Conclusion:This study played an im-portant role in providing a theoretical basis for the conservation,restoration,and reconstruction of U.lamellosa natural populations.
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