青藏高原东缘地区常见植物种子大小变异研究

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Abstract

Some common plants among 10 families on the eastern Qinghai-Tibet plateau were chosen in this investigation,and the variation of their fresh as well as dry seed size were studied.The result showed that: ①The plants of gramineae and compositae are dominant species on the eastern Qinghai-Tibet plateau and consist of 17.49% and 22.76% total speices compsosition.In addition,the average seed size range from 0.1 to 10.0mg.②The abundance of plants with small-size seed is higher than those with big seed size.③Regardless the different taxonomic levels and different life forms,the fresh seed weight indicates significant correlation with the dry seed weight.④The perennial herb is the major life form in typical plateau and conisist of 61.61% total speices composition.As far as seed weight is concerned,the arbor is the heaviest,the shrub takes second place,the herb is the lightest.⑤There is significant linear correlation between the seed size and altitude,and the correlation of seed size and life forms is higher than the seed size and taxonomic levels.

Key words： seed size altitude the life form abundance of plants the eastern Qinghai-Tibet plateau

Received: 25 December 2007

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	YANG Xia
	LIANG Yan
	CHEN Xue-lin

Cite this article:

YANG Xia,LIANG Yan,CHEN Xue-lin. Variation in seed size of some common plant species on the eastern Qinghai-Tibet Plateau[J]. , 2007, 26(6): 483-489.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2007/V26/I6/483

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