氨氧化过程中稻壳生物炭抑制酸性农田土壤N<sub>2</sub>O排放

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Abstract

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.

Key words： ammonia oxidation rice husk-derived biochar acidic arable soil N₂O emission

Received: 29 July 2019

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	DU Sha-sha
	WANG Chao-xu

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DU Sha-sha,WANG Chao-xu. Rice husk-derived biochar inhibited N₂O emission from acidic arable soil under the condition of facilitating ammonia oxidation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(1): 85-91.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I1/85

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