Rice husk-derived biochar inhibited N2O emission from acidic arable soil under the condition of facilitating ammonia oxidation
DU Sha-sha1,2, WANG Chao-xu1
1. College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, China;
2. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
The objective of this research is to examine the effect of rice husk-derived biochar on nitrous oxide (N2O) emission in acidic arable soil. The indoor static soil incubation experiment was carried out for 17days after evenly mixing biochar (0% (control), 2%, 5%, and 10% in the mass ratio) with the soil sample to investigate the diurnal variation of N2O emission rate and the cumulative N2O emission of the soils. Meanwhile, to unravel the mechanisms that control N2O emission from the soil amended with biochar, the pH, NH4+-N, NO3--N, NO2--N, and dissolved organic carbon (DOC) contents of the soils were determined at the end of incubation. The results indicated that the rice husk-derived biochar significantly (P<0.001) inhibited N2O emission of the acidic arable soil under the condition of facilitating ammonia oxidation, especially for the 5% and 10% treatments. Compared with the control, the cumulative N2O emission of the 2%, 5%, and 10% treatments decreased by 87.68%, 94.59%, and 96.90%, respectively. The changes of pH, NH4+-N, and NO3--N contents of the soil amended with different amounts of biochar before and after incubation showed that the biochar promoted soil nitrification process, especially for the 5% and 10% biochar addition rates. The linear regression analysis indicated that N2O emission rate was significantly (P<0.01) positively correlated with NO2--N content at the end of incubation, and NO2--N content could explain 45% variance of N2O emission rate. The biochar-induced nitrification enhancement that accelerated the conversion of NO2- to NO3- resulted in N2O emission decrease by nitrifier denitrification pathway. DOC contents of the 5% and 10% treatments at the end of incubation were significantly higher than the control. However, organic carbon mineralization was not enhanced with biochar addition during the incubation.
杜莎莎, 王朝旭. 氨氧化过程中稻壳生物炭抑制酸性农田土壤N2O排放[J]. 中国环境科学, 2020, 40(1): 85-91.
DU Sha-sha, WANG Chao-xu. Rice husk-derived biochar inhibited N2O emission from acidic arable soil under the condition of facilitating ammonia oxidation. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(1): 85-91.
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