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A comparative study on genetic differentiation of Leymus chinensis in different geographic populations Comparative study of Leymus chinensis′s water content and free proline of different geographic populations under the force of different consistency PEG POD’s and SOD’s Activity and MDA’s Content in Different Geographic Populations of Leymus chinensis’s Comparative Study of Yong Leymus chinensis’s Electrical Resistance and Conductivity of Different Geographic Population