摘要
珍稀濒危植物五小叶槭(Acer pentaphyllum)仅分布于雅砻江中游干旱河谷地区,现今只在四川省雅江县、九龙县、康定市和木里县发现其分布点。本文对这4处五小叶槭群落物种多样性和生态位特征进行了调查与分析。结果表明:⑴由于五小叶槭群落地处雅砻江干旱河谷地区,其群落物种多样性水平不高。⑵五小叶槭种群的生态位宽度较大,但与其它物种的生态位重叠值并不高,说明它是干旱河谷区域的特化种。⑶群落中其它物种之间生态位重叠值普遍很高,显现出其它一些侵入物种组成杂乱,生态位分化水平低,物种间竞争激烈的状况。由此可见,五小叶槭致危的原因并不是来自于其它物种的直接竞争,而更多可能是由于其生态位特化后独特的生物学特性所致。
The rare and endangered Acer pentaphyUum trees were only distributed in the arid valley area of the upper and middle reaches of the Yalong river, and now they were found in Yajiang, Jiulong, Kangding and Mull counties of Sichuan province. In this paper, investigation and analysis were made of the species diversity and niche characteristics of Acer pentaphyllum community in each distribution location. The results showed that （ 1 ） because the Acer pentaphyllum community was located in the Yalong river ar- id valley area, the species diversity of community was not high. （2） The niche breadth of the population of Acer pentaphyllum was large, but the niche overlap with other species was not high, indicating that it was a specialization of the arid valley region. （3） The niche overlap among other species in the community was generally high, showing that other invasive species were disorderly, the level of niche differentia-tion was low, and the competition among species was fierce. It could be seen that the cause for the dan- ger of Acer pentaphyllum was not from the direct competition of other species, but more probably due to the unique biological characteristics of its niche specialization.
出处
《四川林业科技》
2017年第6期79-83,共5页
Journal of Sichuan Forestry Science and Technology
基金
四川省科技计划项目(2014NZ0109)
五小叶槭种质资源抢救性收集
保存
繁育研究
关键词
五小叶槭
物种多样性
生态位宽度
生态位重叠
雅砻江河谷
Acer pentaphyllum, Species diversity, Niche breadth, Niche overlap, The Yalong River valleys
