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《Journal of Arid Land Resources and Environment》 2017-09
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Interspecific competition between Leymus chinensis and Stipa grandis based on the analysis of the phase diagrams

LIU Juhong;HAN Guodong;ZHANG Caiqin;ZHANG Jun;College of Science,Inner Mongolia Agriculture University;College of Grassland,Resources and Environment,Inner Mongolia Agriculture University;  
By using the theory in dynamic system of differential equation we improved the classic Lotka-Volterra model and gave the empirical analysis. We established the mathematical model about moisture competition between Leymus chinensis and Stipa grandis on typical grassland of Inner Mongolia too. Phase diagrams of two grasses' biomass in 2005 and 2014 were mapped. The results proved that the water condition in 2005 was more conducive to Leymus chinensis,and the growth of Stipa grandis was restricted,whereas the growth of Leymus chinensis was restricted in 2014. The general growth trends of the two grasses were in compensation. The compensation of the dominant species and the constructive species made up the big change of productivity caused by the change of precipitation,temperature and other climates conditions. It is helpful for the stability of the grassland ecosystem.
【Key Words】: typical grassland interspecific competition the dynamic system of differential equation phase diagram compensatory
【Fund】: 国家自然科学基金项目(31160091);; 内蒙古自治区自然科学基金(2017MS0120;2017MS0122)资助
【CateGory Index】: S812
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