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| 论文编号: |
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| 论文题目: |
Growth forms of Leymus chinesis (Poaceae) at the different developmental stages of the natural population |
| 英文论文题目: |
Growth forms of Leymus chinesis (Poaceae) at the different developmental stages of the natural population |
| 第一作者: |
张继涛 |
| 英文第一作者: |
Zhang, J. T. |
| 联系作者: |
穆春生 |
| 英文联系作者: |
Mu, C. S. |
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| 发表年度: |
2014 |
| 卷: |
29 |
| 期: |
3 |
| 页码: |
263-271 |
| 摘要: |
The manner in which the density of Leymus chinensis increases from a single plant to a dominant population can be understood by tracing the development of a population from early to late stages. Parent shoot density, above-ground dry weight, spike density, heading rate and spike dry weight, density of spreading shoots (buds/daughter shoots in apical/axillary rhizomes) and clumping shoots (buds/daughter shoots in axillary parent shoots), and young rhizome length and weight were investigated in the same quadrats for a low density/early stage (LE) population and a high density/late stage (HL) population. Clonal growth (buds/daughter shoots formation) and sexual reproduction (spikes formation) increased while rhizome storage (young rhizome weight) decreased during the transition from LE to HL. In a LE population an outward occupation strategy was employed, with a high proportion of spreading shoots. As the population density gradually increased until HL, an inward consolidation strategy increasing shoot amount in previously occupied areas, was adopted. This was characterized by a high proportion of clumping shoots. Interestingly, the trade-off between spreading and clumping shoots can be adjusted by the duration of young rhizome elongation during a growth season. In other words, compared with a HL population, a LE population shortened the duration of young rhizome elongation during the growth season, which resulted in more time for the production of axillary spreading shoots along the rhizomes, and high amounts and proportions of total spreading shoots. The special growth patterns, that is, trade-offs among growth forms, allow L. chinensis to establish dominant populations throughout the eastern Eurasian Steppe. |
| 英文摘要: |
The manner in which the density of Leymus chinensis increases from a single plant to a dominant population can be understood by tracing the development of a population from early to late stages. Parent shoot density, above-ground dry weight, spike density, heading rate and spike dry weight, density of spreading shoots (buds/daughter shoots in apical/axillary rhizomes) and clumping shoots (buds/daughter shoots in axillary parent shoots), and young rhizome length and weight were investigated in the same quadrats for a low density/early stage (LE) population and a high density/late stage (HL) population. Clonal growth (buds/daughter shoots formation) and sexual reproduction (spikes formation) increased while rhizome storage (young rhizome weight) decreased during the transition from LE to HL. In a LE population an outward occupation strategy was employed, with a high proportion of spreading shoots. As the population density gradually increased until HL, an inward consolidation strategy increasing shoot amount in previously occupied areas, was adopted. This was characterized by a high proportion of clumping shoots. Interestingly, the trade-off between spreading and clumping shoots can be adjusted by the duration of young rhizome elongation during a growth season. In other words, compared with a HL population, a LE population shortened the duration of young rhizome elongation during the growth season, which resulted in more time for the production of axillary spreading shoots along the rhizomes, and high amounts and proportions of total spreading shoots. The special growth patterns, that is, trade-offs among growth forms, allow L. chinensis to establish dominant populations throughout the eastern Eurasian Steppe. |
| 刊物名称: |
Plant Species Biology |
| 英文刊物名称: |
Plant Species Biology |
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| 英文参与作者: |
Li, X. J.; Liu, Z.; Li, X. Y.; Gao, Z. W.; Mu, C. S. |
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