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| Effects of nitrification inhibitors on purple soil nitrification and N2O emissions |
| Received:September 21, 2018 |
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| KeyWord:nitrification;nitrification inhibitors;purple soil;nitrification rate;N2O production rate |
| Author Name | Affiliation | E-mail | | LAI Jing-jing | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | LAN Ting | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | tlan@sicau.edu.cn | | WANG Qi | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | TAN Chun-lin | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | | | LI Meng-xiao | College of Resources, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| Calcareous purple soils in the Sichuan Province are characterized by weak nitrogen retention, because of their strong nitrification. In order to investigate the effects of nitrification inhibitors on purple soil nitrification and N2O emissions, we explored the variability of soil inorganic nitrogen content, nitrification rate, and N2O production rate. This was done after the addition of nitrification inhibitors[dicyandiamide (DCD), 3, 4-dimethylpyrazole phosphate (DMPP), 2-chloro-6-(trichloro-methyl) pyridine (Nitrapyrin), methyl 3-(4-hydroxyphenyl) propionate (MHPP)] and nitrogen fertilizers to the calcareous and acid purple soils. The calcareous purple soil was compared with an acid purple soil obtained after incubation at 25℃ and with 60% water holding capacity (WHC). Our results showed that four nitrification inhibitors successfully impeded the conversion of NH4+ to NO3- and reduced the emissions of N2O for both soils; The inhibitory efficiencies of nitrification inhibitors on the calcareous purple soil nitrification rates were:MHPP (93%~193%) > Nitrapyrin (91%~191%) > DMPP (9%~58%) > DCD (6%~14%), while the efficiencies on the acidic purple soil nitrification rates were:MHPP (76%~116%) > Nitrapyrin (62%~109%) > DCD (59%~75%) > DMPP (26%~43%). The inhibitory effects of nitrification inhibitors on the total N2O production in the calcareous and acidic purple soils were 46%~76% and 32%~54%, respectively. In summary, Nitrapyrin and MHPP showed strong inhibitory effects, compared with DCD and DMPP, on nitrification and N2O generation rates of the tested soils. Our results provide a theoretical basis for the field application of nitrification inhibitors to purple soils, encouraging the use of moderate amounts of nitrogen fertilizers, and reducing the environmental risk linked to the use of nitrogen fertilizers. |
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