| AGE STRUCTURES OF MODULES OF CLONAL PEATLAND SEDGE Carex middendorffii |
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| 作者姓名： | Hkan RYDIN |
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| 作者单位： | Department of |
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| 基金项目： | UndertheauspicesoftheNationalNaturalScienceFoundationofChina(No.50139020)andNaturalScienceFoundationforYoungScholarsinNortheastNormalUniversit,yChina(No.111373000) |
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| 摘 要： | 1IN T R O D U C T IO NIn theplantkingdom,phylafrom allevolutionarylevelsshow thecapacityforclonalgrowth(C ALLAGHAN etal.,1992).C lonalplantsarefound inallhabitat,sand inmany harshor stressfuelnvironments,such as peatlandswith poor nutrientsand high soilacidit,y they domi-nate.Clonal plantsinvade and occupy new habitatsandpersistforlong time.For example,V ASEK(1980)found an11000-year-oldclone of Larrea tridentate insouthwest of USA,and individualSphagnum clonesseem topersistformille…
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AGE STRUCTURES OF MODULES OF CLONAL PEATLAND SEDGE Carex middendorffii |
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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). |
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| Authors: | BU Zhao-jun YANG Yun-fei Hakan RYDIN LANG Hui-qing |
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| Institution: | BU Zhao-jun1,2,YANG Yun-fei2,Hakan RYDIN3,LANG Hui-qing1 |
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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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