RESPONESE OF SABINA VULGARIS TO NUTRIENT RESOURCES IN THE CONTRASTING HABITATS IN THE MU US SANDLAND A review on research of plant nutrient use efficiency Effects of mulching management on the internal cycling of nutrients in the rhizomatous roots of Phyllostachys violascens N Internal Cycling in Leymus chinensis Grassland Vegetation-Soil System Nutrient Internal Cycling in Cryptomeria fortunei Fine Root with Senescence Fine Root Mass and Internal Nutrient Cycling in a Broad Leaved-Korean Pine Forest Community of the Changbai Mountain