Growing Responses of Four Exotic Alder Seedling under Different Nitrogen Concentrations Improvement of root parameters in land surface model (LSM) and its effect on the simulated results. Family variation of Pinus massoniana in phosphorus efficiency and retrospective analysis between seedling growth and field trails Root architecture differences and their relationships with the growth of Pinus thunbergii seedlings with three kinds of ectomycorrhizae GCA/SCA of Seedling Growth and Root Parameters in Pinus massoniana and the Phosphorus Environment Influence Spatial Distribution of Fine Roots of a Robinia pseudoacacia Plantation in Yangou Watershed in the Hilly Region of the Loess Plateau