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Analysis of Interspecific Association in Degraded Meadow Communities in the Headwater Area of Yellow River on Tibetan Plateau The Seed Size and Shape Characteristics of 66 Plant Species in the Degraded Grassland of “Black Soil Land” in the Source Region of Yellow River SPATIAL HETEROGENEITY AND SIMILARITY OF ADULT PLANTS AND SEEDLINGS IN ‘BLACK SOIL LAND’ SECONDARY WEED COMMUNITY, QINGHAI-TIBETAN PLATEAU