青藏高原东缘唇形科植物种子大小对萌发的影响研究

doi:10.11733/j.issn.1007-0435.2011.04.011

›› 2011, Vol. 19 ›› Issue (4): 601-606.DOI: 10.11733/j.issn.1007-0435.2011.04.011

青藏高原东缘唇形科植物种子大小对萌发的影响研究

王晨阳^1,2, 张春辉¹, 刘文¹, 张蕾¹, 吕俊平¹, 张莹莹¹, 杜国祯¹

1. 兰州大学干旱与草地生态教育部重点实验室, 甘肃兰州730000;
2. 兰州大学草地农业科技学院, 甘肃兰州730000

收稿日期:2010-12-03 修回日期:2011-04-28 出版日期:2011-08-15 发布日期:2011-08-15
通讯作者: 杜国祯,E-mail:guozdu@lzu.edu.cn
作者简介:王晨阳(1985- ),女,满族,河北承德人,硕士研究生,主要从事种子生态学研究,E-mail:wangcy08@lzu.cn
基金资助:
国家自然科学基金重点项目“青藏高原高寒生态系统地上/地下反馈机制研究”(40930533)资助

Effects of Seed Mass on Germination of Lamiaceae Species in the Eastern Qinghai-Tibetan Plateau

WANG Chen-yang^1,2, ZHANG Chun-hui¹, LIU Wen¹, ZHANG Lei¹, LÜ Jun-ping¹, ZHANG Ying-ying¹, DU Guo-zhen¹

1. Laboratory of Arid and Grassland Ecology, Ministry of Education, Lanzhou University, Lanzhou, Gansu Provicne 730000, China;
2. College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu Provicne 73000, China

Received:2010-12-03 Revised:2011-04-28 Online:2011-08-15 Published:2011-08-15

摘要/Abstract

摘要： 以青藏高原东缘地区24种唇形科(Lamiaceae)种子为材料,在室外自然光照条件下进行萌发试验,研究种子大小与萌发特性的关系,为当地的植被保护或恢复对策的制定提供一定的科学依据。结果表明:24种唇形科植物种子的百粒重为0.0061～0.5688 g,跨越2个数量级,平均大小0.1200 g,60%的物种种子百粒重小于0.1200 g,表明在青藏高原东缘唇形科植物种子中小种子占优势。种子大小与萌发率和萌发速率指数呈极显著负相关(P<0.01);种子大小与集中度呈极显著正相关(P<0.001);种子大小与萌发开始时间的相关性不显著。这些结果说明,这24种唇形科植物的大种子物种和小种子物种有2种相反的萌发对策:小种子萌发率高,萌发速率快,萌发历期短,萌发整齐性好;大种子与小种子相反,并共同与其扩散能力构成了一个由小种子物种(拓植能力)到大种子物种(竞争能力)的连续体,从种子萌发对策上解释了大、小种子物种在同一自然群落中如何共存的问题。

关键词: 种子大小, 萌发率, 萌发速率指数, 集中度, 萌发开始时间, 扩散能力, 唇形科

Abstract: The effects of seed mass on germination characteristics of 24 Lamiaceae species in the eastern Tsinghai-Tibet were studied to provide selected scientific basis for protection and restoration of local vegetation.Seeds germinated under outdoors natural light.Seed weight of tested species were 0.0061～ 0.5688 g per hundred with the variation span of 10² and seed average weight is 0.1200 g.The seed weights of 60% tested species were less than 0.1200 g indicating dominant Lamiaceae species with small seeds in the eastern Tsinghai-Tibet.Germination percentage and germination rate were significantly negative related to seed mass (P<0.01).Seed mass and concentration degree showed significant positive relation (P<0.001).Seed mass and germination did not have significant correlation.There are two opposite germination strategies between large seeds and small seeds of these 24 Lamiaceae plants.Small seeds have higher germination percentage,faster germination rate and shorter duration of germination.Large seeds and small seeds constitute a continuum with their dispersal ability from small-seeded species (colonization) to large-seeded species (competition).This strategy of seed germination can explain how the large and small seeds plants coexist in the same natural community.

Key words: Seed mass, Germination percentage, Germination rate, Concentration degree, First day of germination, Dispersal ability, Lamiaceae

中图分类号:

Q948

王晨阳, 张春辉, 刘文, 张蕾, 吕俊平, 张莹莹, 杜国祯. 青藏高原东缘唇形科植物种子大小对萌发的影响研究[J]. , 2011, 19(4): 601-606.

WANG Chen-yang, ZHANG Chun-hui, LIU Wen, ZHANG Lei, LÜ Jun-ping, ZHANG Ying-ying, DU Guo-zhen. Effects of Seed Mass on Germination of Lamiaceae Species in the Eastern Qinghai-Tibetan Plateau[J]. , 2011, 19(4): 601-606.

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青藏高原东缘唇形科植物种子大小对萌发的影响研究

Effects of Seed Mass on Germination of Lamiaceae Species in the Eastern Qinghai-Tibetan Plateau

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