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Effect of Illumination and Exogenous Substance on Spore Germination andSeedling Survival of Pteridium aquilinum Community structures and plant diversities in the desertification process of Maqu Alpine Meadow in Gansu Effect of Illumination and Exogenous Substance on Spore Germination andSeedling Survival of Pteridium aquilinum Effect of overgrazing on grassland desertification in Maqu County Desertification dynamic change trend and quantitative analysis of driving factors of alpine meadow in Maqu County in the First Meander of the Yellow River Optimization Plan and Management Decision-making for Forage and Livestock in Maqu County The effect evaluation of the program of restoring grazing to grasslands in Maqu County Impact of the Climate on the Vegetation in Maqu County in the Upper Reaches of Yellow River