| 元江流域种子植物区系组成的纬度分布格局 |
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| 引用本文： | 丰帮艳,王燕梅,冯建孟.元江流域种子植物区系组成的纬度分布格局[J].楚雄师专学报,2013(6):69-77. |
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| 作者姓名： | 丰帮艳 王燕梅 冯建孟 |
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| 作者单位： | 大理学院农学与生物科学学院,云南大理671003 |
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| 基金项目： | 云南省自然科学基金（2010CD077）; 大理学院科研启动基金（KY431040）的资助 |
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| 摘 要： | 本研究利用大尺度的物种分布信息和植物区系信息,结合二元相关性分析,探讨了元江流域种子植物区系成分的总体构成和纬度分布格局。结果表明,研究区域共拥有种子植物5149种,分属于241科,1585属,是部分科、属在云南地区,甚至在中国的重要分布中心。在科水平上,泛热带成分（T2）所占比重较大（45.4%）,其次为世界分布成分（T1）（22.4%）。在属水平上,所占比重较大的是热带亚洲成分（T7）（23.2%）和泛热带成分（T2）（18%）。且在科、属水平上,热带区系成分所占比重均在70%左右,温带区系成分比重在30%左右,表现出明显的热带区系性质,这可能与其处于低纬度、低海拔地区并紧邻古热带植物区系等有关。研究结果也表明,随着纬度的升高,温、热带区系成分比重分别呈递增和递减的趋势,这可能与环境梯度的纬度变化有关。同时,这也可能与元江流域在植物区系迁移过程中所发挥的＂通道效应＂有关。
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| 关 键 词： | 种子植物 纬度格局 区系成分 通道效应 元江流域 |
The latitudinal distribution patterns of spermatophyte floristic elements in Yuanjiang River Basin |
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| Institution: | FENG Bang -yan; WANG Yan- mei; FENG Jian - meng ( College of Agriculture and Biological Science, Dali University, Dali 671003, China) |
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| Abstract: | In this study, based on the species distribution information and floristic elements infor- mation at large -scale, coupled with the bivariate correlation analysis, we probed into the overall com- position of spermatophyte flora components and latitudinal patterns of the spermatophyte flora in Yuan- jiang River Basin. The results showed that the study area had a total of 5149 seed plant species, belong- ing to 241 families, 1585 genera. The study area was one of the important distribution centers of some important families and genera in Yunnan, and even in China. At family level, the Pantropical elements （T2） accounted for the largest proportion （45.4%）. The secondary was the World distribution ele- ments （T1） （22.4%）. At genus level, the most important elements were Tropical Asian elements （TT） （23.2%） and the Pantropieal elements （T2） （18%）. Both at families and genera level, the tropical elements accounted for around 70% of the total, whereas the temperate elements accounted for about 30% , showing strong characters of tropical flora. It may be related to the geographical and biogeo- graphical locations of the study area. The results also showed that with the increase of latitude, the trop- ic floristic elements presented a decreasing trend, whereas the temperate elements increased, which may be linked with the environmental gradient on latitudinal gradient. At the same time, it also may be relat- ed to the ＂channel effect＂ of Yuanjiang River basin in flora migration process. |
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| Keywords: | Spermatophyte latitudinal pattern floristic elements channel effects Yuanjiang River Basin |
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