Effects of Nitrogen and Phosphorus Combined Fertilization on Fine Roots and Soil Microorganisms of Machilus Pauhoi

Machilus pauhoi is a precious tree species and timber forest in the subtropical forest system of China, and the increase in soil nitrogen input will have a profound impact on soil microorganisms.However, it is still unclear about the relative growth rate, fine root traits, and the optimal nitrogen to phosphorus ratio of soil microorganisms of Machilus pauhoi.The essay taking the 3-year-old artificial wood-shaven Machilus pauhoi forest as the research object, five fertilization treatments with