Abstract:The niche characteristics of 11 main tree populations in C. kawakamii forests,are analysed by a quantitative method at the natural reserve of C.kawakamii. The niche breadth,niche proportional similarity and niche overlap of main tree populations in C.kawakamii forests were measured by taking community composition types(①C.kawakamii+P.massoniana+S.superba+A.millettii,②C.kawakamii+D.oldhamii+S.superba,③P.massoniana+S.superba+C.kawakamii+L.glaber,④C.kawakamii+S.superba+C.glauca,⑤C.kawakamii+P.mass...