| 摘要: |
| [目的]对青藏高原东缘6属32种菊科植物连萼瘦果的大小及其变异进行了比较,并探讨了影响连萼瘦果大小变异的环境因素.[方法]采集青藏高原东缘6属32种菊科植物的连萼瘦果,测算其长度、宽度和长/宽3项指标,并对上述指标与植物分布海拔高度的相关性进行了分析.[结果]①橐吾属(Ligularia)连萼瘦果平均长度最大,亚菊属(Ajania)、香青属(Anaphalis)和蒿属(Artemisia)连萼瘦果平均长度较小;紫菀属(Aster)和橐吾属的平均宽度相对较大;长/宽的平均值在各属间相差很大,最大的为千里光属(Senecio),蒿属最小.②蒿属、紫菀属、亚菊属和千里光属的连萼瘦果长度、宽度分别与海拔呈正相关性,且连萼瘦果长度与宽度也呈正相关性;橐吾属和香青属的连萼瘦果长度、宽度分别与海拔呈负相关性,但连萼瘦果长度与宽度呈正相关性.③在连萼瘦果大小变异方面,亚菊属、千里光属和香青属连萼瘦果长度的变异系数较小,蒿属、紫菀属和橐吾属的变异系数较大;香青属连萼瘦果宽度的变异系数较小.其他属的变异系数相差不大.[结论]6属菊科植物的连萼瘦果大小及变异差别较大,反映出菊科植物的不同进化水平;海拔是影响菊科植物连萼瘦果大小及变异的一个重要因素. |
| 关键词: 青藏高原东缘 菊科 连萼瘦果 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目(30470307) |
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| Studies on cypsela size and variations' evolutionary ecology of six genera of Compositae from eastern Qinghai-Tibetan Plateau |
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| Abstract: |
| 【Objective】 The cypsela size and variation of 6 genera(32 species) about Compositae of eastern Qinghai-Tibetan Plateau were studied and the environmental facts were discussed.【Method】 The cypsela of 6 genera(32 species) from eastern Qinghai-Tibetan Plateau were collected.The length,width and length/width of the cypsela were computed,then the relativity about the length,width,length/width of the cypsela and altitude were analyzed.【Result】 The results show that:①The mean length of Ligularia is the biggest,and the mean length of Ajania,Anaphalis and Artemisia is the smallest;the mean width of Aster and Ligularia is bigger than that of others;the mean length/width have lots of differences,the biggest being Senecio,and the smallest Artemisia.② The cypsela length and width of Artemisia,Aster,Ajania and Senecio respectively have plus relativity with altitude,and the cypsela length and width also display plus relativity;the cypsela length and width of Ligularia and Anaphalis respectively have minus relativity with altitude,but the cypsela length and width display plus relativity.③At cypsela size variation,the cypsela length variations of Ajania, Senecio and Anaphalis are smaller,the cypsela length variations of Artemisia,Aster and Ligularia are bigger;the cypsela width variation of Anaphalis is smaller,and others have little difference.【Conclusion】 The cypsela size and variation have big differences between 6 genera.It reflects diverse evolutive level.The altitude is an important factor affecting the size of cypsela and its variation. |
| Key words: eastern Qinghai-Tibetau Plateau Compositae cypsela |
