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《Acta Prataculturae Sinica》 2006-03
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Above ground biomass dynamics and comparative study of two Lespedeza species on Songnen grassland

ZHANG Bao-tian~1,MU Chun-sheng~1,JIN Cheng-ji~2,ZHANG Fu-tian~3(1.Institute of Grassland Science,Key Laboratory of Ecological Restoration and Ecosystem Management of Jilin Province,Northeast Normal University,Changchun 130024,China;2.Grassland Management Station of Korean Autonomous Prefecture of Yanbian,Yanji 133001,China3.Studhorse field of Changling,Changling 131511,China)  
Research on above ground biomass dynamics of Lespedeza daurica and L.hedysaroides on Songnen grassland showed that: the total aboveground biomass and the biomass in stems and leaves varied with the season over the whole growing period.They accumulated exponentially while the biomass of flowers and legume increased linearly.The total above ground biomass of L.daurica was 1.78 times that of L.hedysaroides and the stems,leaves,flowers and pods were 1.31,1.59,and 2.62 times that of L.hedysaroides respectively.The leaf ratios of both species declined in biomass while the stem ratios rose gradually over the full growing season.The stem and leaf ratio change is important for the start of reproductive growth.Both RGR curves with two peaks correlated closely with the environmental factors outside the development phases.The spread of L.daurica was greater than that of L.hedysaroides.So L.daurica does not need to be planted as closely as L.hedysaroides.
【Key Words】： Songnen grassland Lespedeza daurica L.hedysaroides above ground biomass interspecific comparative
【Fund】： 吉林省自然科学基金(20030554)资助
【CateGory Index】： S541.5
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