Abstract:
Atmospheric nitrogen deposition is one of the new ecological factors that affect forest ecosystem. Excessive nitrogen deposition will change soil microorganism involved in material transformation and nutrient cycling of forest ecosystem. This paper reviews the current situation of the effects of simulated nitrogen deposition on the biomass, community structure and diversity, microbial activity and enzyme activity, substrate utilization capacity and functional genes in forest soil. The results showed that: ① Overall, there are many reports about the negative effects of nitrogen deposition on the biomass of forest soil microorganisms; ② The nitrogen deposition changed the structure and diversity of forest soil microbial community; ③ The nitrogen deposition promotes the forest soil respiration rate in a short time, and the long-term nitrogen input will inhibit the soil respiration rate; ④ Nitrogen deposition changed the activity of soil enzymes involved in litter decomposition; ⑤ Nitrogen deposition reduced the metabolism ability of soil microbial metabolism complex organic matter; ⑥ Nitrogen deposition increased and decreased the abundance of some microbial functional genes. In addition, the problems of nitrogen deposition on the study of forest soil microorganisms and the key points of future research are also discussed.