STUDY ON GEOGRAPHICAL VARIATION OF PHENOLOGY OF CHINESE FIR AND ITS CORRELATION TO PRODUCTIVITY IN CHINA Effects of soil fumigants on soil nitrification and denitrification The N2O concentration and the relationships with ammonia-oxidizing bacteria and denitrifiers abundance in root zone and row of summer maize Effect of fertilization on bacterial community, genetic diversity of amoA and nosZ genes in paddy soil Mechanism of nitrification inhibitor on nitrogen-transformation bacteria in vegetable soil