Responses of Hydraulic Transport Efficiency and Safety of Current year Stems in Pinus tabulaeformis Seedlings to Nutrient Addition and Irrigation Effect of Water Addition on Northern Style Chinese Steamed Bread Processing Quality Effects of nitrogen and water addition on herbage N and P concentrations of Stipa breviflora in a desert steppe grassland Effects of nitrogen and water addition on plant species diversity and biomass of common species in the Stipa baicalensis Steppe, Inner Mongolia, China