Effect of Climatic Factors on Nitrogen Fixation in Three Leguminous Trees A New Butt and Root Rot of Acacia confusa in Hainan of China Life Procession and Spectral Analysis of Acacia confusa Population Effect of inoculating ectomycorrbizal fungus on Acacia confusa and Pinus massoniuna seedlings Study on the niche of major population of Acacia confusa forest in Nan’ao,Guangdong