| AGE STRUCTURES OF MODULES OF CLONAL PEATLAND SEDGE Carex middendorffii |
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| 作者姓名： | BU Zhao-jun YANG Yun-fei Hakan RYDIN LANG Hui-qing |
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| 作者单位： | [1]Institute for Peat and Mire Research, Northeast Normal University, Changehun 130024, P. R. China [2]State Environmental Protection Ministry Key Laboratory of Wetland Conservation and Vegetation Restoration, Changchun 130024, P. R. China [3]Institute for Grassland Sciences, Northeast Normal University, Changchun 130024, P. R. China [4]Key Laboratory for Vegetation Ecology, Ministry of Education, Changchun 130024, P. R. China [5]Department of Plant Ecology,Uppsala University, Uppsala SE- 752 36, Sweden |
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| 基金项目： | Under the auspices of the National Natural Science Foundation of China （No.50139020） and Natural Science Foundation for Young Scholars in Northeast Normal University, China （No. 111373000） |
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| 摘 要： |
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| 关 键 词： | 泥炭地 无性繁殖 植物分布 地区分布 |
| 文章编号： | 1002-0063（2005）03-0269-06 |
| 收稿时间： | 2005-04-18 |
Age structures of modules of clonal peatland sedge <Emphasis Type="Italic">Carex middendorffii</Emphasis> |
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| BU Zhao-jun YANG Yun-fei Hakan RYDIN LANG Hui-qing.AGE STRUCTURES OF MODULES OF CLONAL PEATLAND SEDGE Carex middendorffii[J].Chinese Geographical Science,2005,15(3):269-274. |
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| Authors: | Bu Zhao-jun Håkan Rydin Lang Hui-qing |
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| Institution: | (1) Institute for Peat and Mire Research, Northeast Normal University, 130024 Changchun, P. R. China;(2) State Environmental Protection Ministry Key Laboratory of Wetland Conservation and Vegetation Restoration, 130024 Changchun, P. R. China;(3) Institute for Grassland Sciences, Northeast Normal University, 130024 Changchun, P. R. China;(4) Key Laboratory for Vegetation Ecology, Ministry of Education, 130024 Changchun, P. R. China;(5) Department of Plant Ecology, Uppsala University, SE-752 36 Uppsala, Sweden |
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| Abstract: | Age structure of a plant population carries important information on population dynamics. The traditional age classification of individuals by development phases could not explain the generation relationship neither between individuals nor between modules, and it could not accurately predict the future of population or the tendency of peatland evolution. In a peatland of the Xiao Hinggan Mountains, China, at the middle of the growth season, the age structures of 3 modules, ramets, active buds and rhizomes of a Carex middendorffii clonal population were investigated, with the method of classifying age classes of ramets and active buds by counting generation quantity of tiller nodes, and classifying age classes of rhizomes by their real survival time. The quantity of vegetative ramets was dominant. Tiller nodes of ramets can propagate vegetatively for a maximum of 3 generations. The population of ramets consisted of 3 age classes of ramets at the middle of the growth season, and showed a stable age structure. In the two sampling events, there was no significant difference between quantities and age structure of the population. The maximum age of an excavated rhizome was 12 years old. Rhizomes were classified in 8 age classes, and age classes 4-6 contributed most to the total biomass. There was no significant difference in total length and total biomass per unit area, or in biomass per unit length in rhizomes between the two samplings. Four age classes of active buds were recognized, and their number increased from July to August. The Carex middendorffii clonal population achieved regeneration by budding from the tiller nodes of ramets. The age structures of the 3 modules suggested that the Carex middendorffii clonal population could persist in the early development phase of the oligotrophic peatland in the Xiao Hinggan Mountains, but it could not be dominant. It also faces the risk to disappear from the community as the peatland develops further. |
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| Keywords: | Carex middendorffii module age structure peatland |
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