LaboratoryofQuantitativeVegetationEcology;
InstituteofBotany;
TheChineseAcademyofSciences;
Beijing100093;
China;
InnovationBaseofRegionalEcologicalEnvironmentProtection;
ChineseResearchAcademyofEnvironmentalScience;
Beijing100012;
China;
CollegeofLifeSciences;
InnerMongoliaUniversity;
Huhhot010021;
China;