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Methods of Grazing Grassland Vegatation Survey Modeling Size-number Distributions of Seeds for Use in Soil Bank Studies Leaf area regression analysis of five Pyracantha species STUDY ON RELATIONSHIPS BETWEEN SLOPE GRADIENT AND SOIL LOSS USING ~(137)Cs TRACER Above-Ground Biomass Distribution Models for Arbor Layer of Eight Subtropical Forest Types Spatial heterogeneity of vegetation under different grazing intensities in a Stipa breviflora desert steppe