Seed vigor and plant competitiveness resulting from seeds of Eupatorium adenophorum in a persistent soil seed bank
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作者: | Shen YX | ||||||||
刊物名称: | Flora | ||||||||
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论文题目英文: | Seed vigor and plant competitiveness resulting from seeds of Eupatorium adenophorum in a persistent soil seed bank | ||||||||
年: | Nov 2011 | ||||||||
卷: | 206 | ||||||||
期: | 11 | ||||||||
页: | 935-942 | ||||||||
联系作者: | Shen YX | ||||||||
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影响因子: | 1.657 | ||||||||
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摘要: | Seeds in a persistent soil seed bank (PSSB) provide an effective way to maintain plant population and community stability. Seeds that persist in soil incur physiological costs of maintaining viability and vigor, thus, the growth capability of resultingplants may be reduced. However, a lot of functional roles of the PSSB have been deduced from seed germination capability, and little consideration has been given to interspecific and intraspecific competitive ability of the resultingplants. Eupatorium adenophorum was used as the study species to compare germination of different artificially aged PSSB seeds and competition at different densities between resultingplants of aged and freshly produced seeds. Seed burial caused decreases in survival rates but not germination speed. During the 175-day growth period, the individual biomass, average height, basal stem diameter and leaf number of plants from aged PSSB seeds were little lower than that of plants germinated from freshly produced seeds. However, the differences were not significant at any densities. Thus, (1) although seeds stored in soil exhibited a very high death rate, they maintained a high vigor for germination, and (2) resultingplants from PSSB seeds exhibited good competiveness to plants from new seeds of the same population. The results further confirm the significance of PSSB in maintaining stability of plant populations and communities. | ||||||||
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