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青藏高原东缘大耳叶风毛菊繁殖特征对海拔的响应

陈亭,王一峰**   

  1. (西北师范大学生命科学学院, 兰州 730070)
  • 出版日期:2014-12-10 发布日期:2014-12-10

Response of reproductive characteristics of Saussurea macrota Franch. to elevation at eastern QinhaiTibetan Plateau.

CHEN Ting, WANG Yi-feng**   

  1. (College of Life Sciences, Northwest Normal University, Lanzhou 730070, China)
  • Online:2014-12-10 Published:2014-12-10

摘要: 研究了青藏高原东缘不同海拔12个居群大耳叶风毛菊(Saussurea macrota Franch.)繁殖分配对海拔的响应。结果表明:(1)随着海拔的升高,大耳叶风毛菊个体大小呈现减小的趋势,但其繁殖分配随海拔升高而增大,这是为了保证顺利完成有性繁殖而采取的生存策略;(2)大耳叶风毛菊部分花部特征发生变异,以响应随海拔升高面临的传粉困难问题,保证花期传粉的最大成功几率;(3)随着海拔的升高,大耳叶风毛菊产生的种子数目减少,种子百粒重增加;花序和管状小花的数量均减少,而它们的重量均增加,即权衡现象在大耳叶风毛菊的这些器官中普遍存在。

关键词: 根系, 基因调控, 生物炭, 作物生长, 生物炭与化肥混施, 互作增效

Abstract: The reproductive allocation of 12 Saussurea macrota Franch. populations at different elevations in eastern QinhaiTibetan Plateau was studied in this paper. The results showed that: (1) With the increase of elevation, the individual size of S. macrota decreased, and it invested more resource in reproductive organs to ensure sexual reproduction. (2) The floral traits of S. macrota changed with elevation, ensuring pollination effectively. (3) The seeds number of S. macrota decreased, while the 100seed weight increased with rising the elevation. Meanwhile, the numbers inflorescence and tubulous flower decreased but their weights increased with the increase of elevation. Therefore, the tradeoff is a common phenomenon in the organs of S. macrota.

Key words: biochar, crop growth, combined application of biochar and fertilizer, synergistic effects, roots, gene regulation