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Windbreak Effects of Different Scheme Artemisia ordosica Shrub for SandFixation in Low Cover Configuration and Dynamic Formation of Root System in Flue-cured Tobacco The relationship between species distribution pattern and environment factors in grassland of the Yunwu Mountain Genetic differentiation and distributing pattern of Cordyceps sinensis in China revealed by rDNA ITS sequences Analysis on the Geographical Distribution Characteristics of Angiopteridaceae and Its Causes in Yungui Plateau and Hengduan Mountains, China