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太白红杉群落优势种的生态位研究
Studies on niche of dominant species in Larix chinensis communities
【摘要】 应用Levins和Shannon-Wiener生态位宽度指数及Pianka生态位重叠指数,研究了太白红杉群落12个优势种的生态位宽度和生态位重叠.结果表明,乔木层中太白红杉的生态位宽度最大,对高海拔地区的环境适应能力较强,巴山冷杉对的低海拔地区的环境适应能力较强;灌木层中香柏的生态位宽度最大,华西忍冬、华西银腊梅、太白忍冬次之,头花杜鹃的生态位宽度最小.乔木层中太白红杉与巴山冷杉的生态位重叠较大,但二者只在低海拔分布范围有重叠;灌木层头花杜鹃的分布范围较大,与其它3个种的生态位重叠也最大,另外3个种的生态位重叠较小;草本层中毛状苔草、羊茅和嵩草的生态位重叠较大,而大叶碎米荠和太白银莲花的生态位重叠较小.
【Abstract】 In this paper,the niche breadth and niche overlay of 12 dominant species were studied,using the methods of Levins and ShannonWiener indexes of niche breadth and Pianka index of niche overlap.The result shows that the niche breadth of Larix chinensis is broadest in tree layer and the adaptation of Larix chinensis is strongest in higher altitude while Abies fargesii is in lower altitude.In shrub layer,the niche breadth of Sabina squamata var.wilsonii is broader than other 3 species.The niche overlay of Larix chinensis and Abies fargesii in tree layer is much large,but they formed mixed forest only in lower altitude.And the niche overlay of Rhododendron capitatum in shrub layer is largest.In grass layer,the overlay of Festuca graminifolia?Kobresia graminifolia and Carex capilliformis are larger than Cardamine macrophylla and Anemone taipaiensis.
【Key words】 Larix chinensis communities; dominant species; niche breadth; niche overlay;
- 【文献出处】 西北植物学报 ,Acta Botanica Boreali-occidentalia Sinica , 编辑部邮箱 ,2003年10期
- 【分类号】Q948
- 【被引频次】33
- 【下载频次】249