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云南西部地区地带性植物群落物种多样性的地理分布格局

冯建孟1;徐成东2   

  1. 1大理学院下关校区生命科学与化学学院, 云南大理 671000;2楚雄师范学院化学与生命科学系, 云南楚雄 675000
  • 收稿日期:2008-06-03 修回日期:1900-01-01 出版日期:2009-04-10 发布日期:2009-04-10

Geographical distribution patterns of zonal plant community species diversity in West Yunnan, China.

FENG Jian-meng1;XU Cheng-dong2   

  1. 1College of Life Science and Chemistry, Dali University, Dali 671000, Yunnan, China;2Department of Chemistry and Life Science, Chuxiong Normal College, Chuxiong 675000, Yunnan, China
  • Received:2008-06-03 Revised:1900-01-01 Online:2009-04-10 Published:2009-04-10

摘要: 利用样方数据和文献资料,探讨了云南西部地区地带性植物群落的物种多样性。结果表明:在纬度梯度上,从南到北,物种密度呈递减趋势;在海拔梯度上,从高海拔到低海拔,物种密度呈递增趋势;在经度梯度上,从东到西,物种密度呈递减格局。总体上,在群落尺度上,南部地区物种密度较高;北部地区,即滇西北地区物种密度相对较低,这可能与研究区域内热量和水分条件的空间分异有关,但热量因子可能扮演着更为重要的角色。海拔梯度上的物种变化速率远高于经度梯度和纬度梯度,这可能与海拔梯度上热量条件的变化速率远高于其他地理梯度有关。区域尺度上单位面积物种多样性的分布格局与群落尺度明显不同,这可能源于群落尺度上单位面积的物种多样性主要受制于能量水平;但在区域尺度上,单位面积的物种多样性可能与区域内的生境异质性有关。表明“尺度效应”在塑造物种多样性地理分布格局中的重要作用。

关键词: NO, 水分胁迫, 杨树, 叶绿素荧光参数, 保护

Abstract: Based on field investigation and related literatures, the geographical distribution patterns of zonal plant community species diversity in West Yunnan of China were approached. The results showed that the species density had a dec reasing trend from south to north and from east to west, and decreased with incr easing altitude. On community scale, the species density was higher in southern part but relatively lower in northern part, being consistent to the spatial vari ation of mean annual air temperature and mean annual precipitation. To some exte nts, mean annual temperature might play a much stronger role. The change rate of species density was much higher along altitudinal gradient than along longitude and latitude gradients, possibly due to the greater change rate of mean annual air temperature at altitudinal gradient. There was an obvious difference in the distribution patterns of the species diversity between community-scale and regi onal-scale. On community scale, species diversity could be controlled by the en ergy level in the environment; while on regional scale, this diversity was possi bly related to the heterogeneity of habitats. Scale effect played a key role in the geographic distribution patterns of species diversity.

Key words: Nitric oxide, Water stress, Poplar, Chlorophyll fluorescence parameter, Protection