Effects of elevated N availability on anatomy, morphology and mycorrhizal colonization of fine roots: A review. Advances in the Studies on Water Uptake by Plant Roots Phosphate Availability Alters Lateral Root Anatomy and Root Architecture of Fraxinus mandshurica Rupr. Seedlings Morphological and Anatomical Responses of Fraxinus mandshurica Seedling Roots to Different Nitrogen Concentrations