Review of root nutrient foraging plasticity and root competition of plants RESPONESE OF SABINA VULGARIS TO NUTRIENT RESOURCES IN THE CONTRASTING HABITATS IN THE MU US SANDLAND Spatial heterogeneity of soil nutrients and root foraging: from individual to community Phenotypic responses of a clonal plant (Buchloe dactyloides) to nutrient heterogeneity Vegetation Change and Soil Nutrient Distribution along an Oasis-Desert Transitional Zone in Northwestern China Ramets and Genets in the Tillering Clonal Herb Panicum miliaceum in Hierarchical Response to Heterogeneous Nutrient Environments Contribution of fine root to soil nutrient heterogeneity at two sides of the bamboo and broadleaved forest interface