Ramet population ecology of Panicum virgatum in the field —Competitively random growth of ramets and foraging behavior of ramet populations |
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摘 要: | The authors investigated the heterogeneous size patterns and dynamic growth of the ramet population of Panicum virgatum, a clonal caespitose plant, limited to the space occupied by a ramet bunch and the time of the ramet yearly life cycle, to understand the ecology of clonal caespitose plants in the field, where the ramet bunch generally consisted of more than one genet. Dynamic life tables for ramet populations were established by the replacement of living ramets at the present time with "dead" ones in past time. These tables revealed stable coexisting patterns of isometric and allometric growing processes of ramets in mass and height respectively, which approximately followed the historic trajectory of a density-independent population. The ecology of clonal caespitose plants is further discussed based on the competitively random growth of ramet individuals, including the scale of foraging behavior. In the field, the ramet population ecology of switchgrass may be a statistical result of competitively random growth of ramet individuals. The foraging behavior of a ramet population could then be presented as a process in which ramet individuals competed with each other for light and grew randomly, while at the same time a relatively stable dynamic growth pattern was apparent at the level of the ramet population, and the functional leaves were placed properly in time and space.
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关 键 词: | 黍 无性繁殖 生命统计表 表型塑性 草料 |
收稿时间: | 6 January 2008 |
修稿时间: | 30 January 2008 |
Ramet population ecology of Panicum virgatum in the field – Competitively random growth of ramets and foraging behavior of ramet populations |
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Authors: | Xinguo Yang Tianlong Wu Xu Cheng |
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Institution: | a) Biomass Engineering Center, Resource and Environment College, China Agriculture University, Beijing 100094, China;
b) Sustainable Agriculture Center, Agronomy and Biotechnology College, China Agriculture University, Beijing 100094, China |
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Abstract: | The authors investigated the heterogeneous size patterns and dynamic growth of the ramet population of Panicum virgatum, a clonal caespitose plant, limited to the space occupied by a ramet bunch and the time of the ramet yearly life cycle, to understand the ecology of clonal caespitose plants in the field, where the ramet bunch generally consisted of more than one genet. Dynamic life tables for ramet populations were established by the replacement of living ramets at the present time with “dead” ones in past time. These tables revealed stable coexisting patterns of isometric and allometric growing processes of ramets in mass and height respectively, which approximately followed the historic trajectory of a density-independent population. The ecology of clonal caespitose plants is further discussed based on the competitively random growth of ramet individuals, including the scale of foraging behavior. In the field, the ramet population ecology of switchgrass may be a statistical result of competitively random growth of ramet individuals. The foraging behavior of a ramet population could then be presented as a process in which ramet individuals competed with each other for light and grew randomly, while at the same time a relatively stable dynamic growth pattern was apparent at the level of the ramet population, and the functional leaves were placed properly in time and space. |
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Keywords: | Caespitose clone Ramet population Panicum virgatum Life table Phenotypic plasticity Foraging behavior |
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