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Study on soil erosion and deposition of black soils on a sloping cultivated land using 137Cs tracer method Apparent settling velocity of nutrients in Banchengzi Reservoir, Beijing Influence of Sulphur Fertilizer on Sulphur Cycling and Its Implications on Sulphur Fertilizer Requirement of Grazed Pasture in Warm Seasonal Rangeland of Nei Monggol Steppe of China