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Primary Study on Characteristics of Leymus chinensis in Two Soil Types

Wang Yuhui 1,2 Zhou Guangsheng 2 ( 1 Institute of Applied Ecology,Academia Sinica,Shenyang,110015) ( 2 Laboratory of Quantitative Vegetation Ecology,Institute of Botany,Academia Sinica,Beijing 100093).$$$$  
Studies on photosynthesis characteristic,soil respiration and biomass (aboveground/belowground)of Leymus chinensis in two soil types had been made in 1999.The results show that(1)Leaf width,net photosynthesis ratio(An)and stomatal conductance(gs) of Leymus chinensis in meadow alkali soil are less than those in wind sand soil,and plants are higher than those in wind sand soil,but leaf length,transpiration rate and water use efficiency have no significant difference in two soil types.(2)Aboveground biomass,density and shoot/root of Leymus chinensis in meadow alkali soil are larger than those in wind sand soil,but belowground biomass has no significant difference in two soil types.(3)CO 2 releasing from soil respiration and litter of Leymus chinensis community in meadow alkali soil is more than that in wind sand soil.
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