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Impacts of environmental factors on spatial distribution of soil moisture of grassland in Yunwu Mountain Algor ithm of Or ienta tion and Standardiza tion on SpiculeMorpholog ic Imageof Bursaphe lenchus ( Nema toda: Aphelencho ididae) Effects of Enclosing and Shallow Ploughing as Improvement Technologies on the Vegetation Restoration of Degraded Leymus chinensis (Trin.) Tzvel. Meadow Grassland Study on Enclosing Effects and Biodiversity Variation of Desertification Grassland in Hulunbeir Steppe