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| Effects of combined application of biochar and nitrification inhibitor on N2O emission from tropical rice-vegetable rotation soils in Hainan region |
| Received:July 01, 2024 |
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| KeyWord:biochar;nitrification inhibitor;N2O emissions;tropical;rice-vegetable rotation system |
| Author Name | Affiliation | E-mail | | WANG Xiaoqi | Hainan Guowei Yike Environment Co., Ltd., Hainan 570100, China | | | JIANG Chunlan | Hainan Research Academy of Environmental Sciences, Hainan 571126, China | | | MENG Longwei | Hainan Research Academy of Environmental Sciences, Hainan 571126, China | | | LI Kaikai | Hainan Research Academy of Environmental Sciences, Hainan 571126, China | | | WU Yanzheng | School of Breeding and Multiplication, Hainan University, Sanya 572025, China | | | ZHU Qilin | School of Breeding and Multiplication, Hainan University, Sanya 572025, China | | | MENG Lei | School of Breeding and Multiplication, Hainan University, Sanya 572025, China | menglei@hainanu.edu.cn |
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| Abstract: |
| To elucidate the impacts and mechanisms of biochar and nitrification inhibitors on N2O emission from rice-vegetable rotation soils in Hainan. The experiment set up without biochar and nitrification inhibitor treatments（CK）, adding 2% biochar（B）, 2% biochar combined with nitrification inhibitor dicyandiamide（DCD; BD, addition amount is 5% of pure nitrogen）and 3, 4-dimethylpyrazole phosphate（DMPP; BP, addition amount is 1% of pure nitrogen）, and combined with 1/2 of DCD and DMPP（BDP）. Each treatment set to the flooding environment and 60% soil water capacity（WHC）, respectively. Biochar added significantly increased the soil organic carbon（SOC）contents and total nitrogen（TN）under different water conditions. Biochar addition significantly increased the contents of soil microbial biomass carbon（MBC）and microbial nitrogen（MBN）under different water conditions compared with CK. However, compared with B treatment, the MBC content decreased significantly of biochar combined with nitrification inhibitor treatments. Under 60%WHC condition, the biochar addition significantly increased soil pH, and the combination of biochar and nitrification inhibitor further increased soil pH. Compared with CK, biochar addition significantly promoted soil N2O cumulative emission at 60%WHC. The cumulative soil N2O emission of in BD was significantly lower than that in CK and B treatments. The cumulative soil N2O emission in BP and BDP was significantly higher than that in CK, but significantly lower than that in B treatment. Under flooding condition, B treatment significantly promoted soil N2O emission compared with CK, and biochar addition combined with nitrification inhibitors significantly reduced the cumulative N2O emission. adding biochar to rice-vegetable rotation soil can promote soil N2O emission in the short term. Applying DCD can effectively reduce soil N2O emissions in dryland conditions, and applying DCD and DMPP under flooded conditions can significantly reduce soil N2O emissions, with the best effect when both are applied but the dosage is halved. |
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