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《Acta Prataculturae Sinica》 2006-05
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Allometry regulation of leaf module for two ecotypes of Leymus chinensis in Songnen Plain,China

ZHOU Chan~(1,2),YANG Yun-fei~2(1.College of Resources Science and Technology,Beijing Normal University,MOE Key Laboratory of Environmental Change and Natural Disasters,Beijing 100875,China;2.Institute of Grassland Science,Northeast Normal University,Key Laboratory for Vegetation Ecology,Ministry of Education,Changchun 130024,China)  
Growth indices of leaf and tiller of two ecotypes of Leymus chinensis were determined in different habitats.This paper provides a theoretical basis for improving yield and quality of pasture production.Under sand and saline-alkali soil habitats,leaf biomass of different age tillers increased with an increase of height in the grey-green and yellow-green ecotypes of L.chinensis.It showed a significant power relationship(y=ax~b) between biomass and height of tiller and between leaf biomass and leaf length and width.The b value in the function expressed growth rate of biomass and width of leaf.The power function had more biological and ecological meaning than other functions.The leaf modules of different age tillers of grey-green and yellow-green ecotypes had the same regulation of allometry and biomass accumulation at the reproductive stage in the Songnen Plain.All quantity indices,such as biomass,length and width of leaf and regulation of biomass accumulation,were different between the two habitats of the same ecotype and between the two ecotypes at the same habitat.The results showed both ecotypes had adapted to their corresponding habitat and obviously had ecological plasticity.
【Fund】: 国家自然科学基金项目(30590384 30270260 30470272);; 中国博士后科学基金项目(2005038322)资助
【CateGory Index】: S543.9
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