Reducing nitrogen runoff from paddy fields with arbuscular mycorrhizal fungi under different fertilizer regimes  

作　　者：Shujuan Zhang Li Wang Fang Ma Xue Zhang Dafang Fu 

机构地区：[1]State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering,Harbin Institute of Technology [2]Department of Municipal Engineering, School of Civil Engineering, Southeast University

出　　处：《Journal of Environmental Sciences》2016年第8期92-100,共9页环境科学学报（英文版）

基　　金：supported by the Major Science and Technology Program for Water Pollution Control and Treatment (No. 2012ZX07201003);the National Natural Science Foundation of China (No. 31570505);the Natural Science Foundation of Heilongjiang Province,China (No. E201206);the State Key Lab of Urban Water Resource and Environment (Harbin Institute of Technology) (No. 2014TS05)

摘　　要：Nitrogen（N） runoff from paddy fields serves as one of the main sources of water pollution. Our aim was to reduce N runoff from paddy fields by fertilizer management and inoculation with arbuscular mycorrhizal fungi（AMF）. In northeast China, Shuangcheng city in Heilongjiang province, a field experiment was conducted, using rice provided with 0%, 20%, 40%, 60%, 80%,and 100% of the local norm of fertilization（including N, phosphorus and potassium）, with or without inoculation with Glomus mosseae. The volume, concentrations of total N（TN）,dissolved N（DN） and particulate N（PN） of runoff water were measured. We found that the local norm of fertilization led to 18.9 kg/ha of N runoff during rice growing season, with DN accounting for 60%–70%. We also found that reduction in fertilization by 20% cut down TN runoff by 8.2% while AMF inoculation decreased N runoff at each fertilizer level and this effect was inhibited by high fertilization. The combination of inoculation with AMF and 80% of the local norm of fertilization was observed to reduce N runoff by 27.2%. Conclusively, we suggested that the contribution of AMF inoculation combined with decreasing fertilization should get more attention to slow down water eutrophication by reducing N runoff from paddy fields.Nitrogen（N） runoff from paddy fields serves as one of the main sources of water pollution. Our aim was to reduce N runoff from paddy fields by fertilizer management and inoculation with arbuscular mycorrhizal fungi（AMF）. In northeast China, Shuangcheng city in Heilongjiang province, a field experiment was conducted, using rice provided with 0%, 20%, 40%, 60%, 80%,and 100% of the local norm of fertilization（including N, phosphorus and potassium）, with or without inoculation with Glomus mosseae. The volume, concentrations of total N（TN）,dissolved N（DN） and particulate N（PN） of runoff water were measured. We found that the local norm of fertilization led to 18.9 kg/ha of N runoff during rice growing season, with DN accounting for 60%–70%. We also found that reduction in fertilization by 20% cut down TN runoff by 8.2% while AMF inoculation decreased N runoff at each fertilizer level and this effect was inhibited by high fertilization. The combination of inoculation with AMF and 80% of the local norm of fertilization was observed to reduce N runoff by 27.2%. Conclusively, we suggested that the contribution of AMF inoculation combined with decreasing fertilization should get more attention to slow down water eutrophication by reducing N runoff from paddy fields.

关 键 词：Nitrogen loss Runoff Paddy fields Arbuscular mycorrhizal fungi Fertilization Dissolved nitrogen Particulate nitrogen 

分 类 号：X52[环境科学与工程—环境工程] X71