Effects of Phosphorus Fertilization and Ectomycorrhizal Fungal Inoculation on Productivity and Nutrient Accumulation of Eucalyptus globulus Plantation Soil phosphorous accumulation in long-term P fertilization paddy field and its environmental effects Relationship among the application of N,P and the yield characteristics of cluster redpepper Fertilization effects of N、P on a grass community at the dryvalley of Jinsha River