Synergistically mitigating nitric oxide emission by co-applications of biochar and nitrification inhibitor in a tropical agricultural soil
文献类型： 外文期刊
作者： Fan, Changhua 1 ; Leng, Youfeng 1 ; Zhang, Qi 1 ; Zhao, Xiongwei 1 ; Gao, Wenlong 1 ; Duan, Pengpeng 6 ; Li, Zhaolei 7 ; Luo, Gongwen 8 ; Zhang, Wen 1 ; Chen, Miao 1 ; Li, Qinfen 1 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Hainan Key Lab Trop Ecocircular Agr, Haikou 571101, Peoples R China
2.Hainan Danzhou Trop Agroecosystem Natl Observat &, Danzhou 571737, Peoples R China
3.Minist Agr & Rural Affairs, Key Lab Green & Low Carbon Agr Trop China, Haikou 571101, Peoples R China
4.Hainan Univ, Coll Ecol & Environm, Haikou 570228, Peoples R China
5.Guizhou Minzu Univ, Coll Ecoenvironm Engn, Guiyang 550025, Peoples R China
6.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Peoples R China
7.Southwest Univ, Acad Agr Sci, Coll Resources & Environm, Chongqing 400716, Peoples R China
8.Hunan Agr Univ, Coll Resources & Environm, Hunan Prov Key Lab Farmland Pollut Control & Agr R, Changsha 410128, Peoples R China
9.Chinese Acad Trop Agr Sci, Haikou 571101, Hainan, Peoples R China
关键词： Nitric oxide emission; N cycling; Biochar; Nitrification inhibitor; Bacterial community
期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：8.431； 五年影响因子：8.399 ）
ISSN： 0013-9351
年卷期： 2022 年 214 卷
页码：
收录情况： SCI
摘要： Agricultural soils are the hotspots of nitric oxide (NO) emissions, which are related to atmospheric pollution and greenhouse effect. Biochar application has been recommended as an important countermeasure, however, its mitigation efficiency is limited as biochar, under certain conditions, can stimulate soil nitrification. Therefore, biochar co-applied with nitrification inhibitor could optimize the mitigation potential of biochar. Herein, a laboratory-scale experiment was conducted to investigate the effects of co-application of biochar and nitrification inhibitor on NO emission, nitrogen cycling function and bacterial community in a tropical vegetable soil. Results showed that a single application of biochar or nitrification inhibitor significantly decreased NO emissions, and this mitigation effectiveness was amplified by their co-applications. Soil NO2--N intensity, along with abun-dances of AOB-amoA and nirK were significantly and positively correlated with cumulative NO emissions. The stimulated activity of ammonia monooxygenase and growths of AOB and total comammox Nitrospira by biochar were weakened by nitrification inhibitor, implying decreased nitrification-driven NO production. The nitric oxide reductase activity and related qnorB abundance in nitrification inhibitor-added soils were increased by biochar, indicating promoted NO consumption during denitrification. The nirK abundance and NO2--N intensity were decreased more by co-applications of biochar or nitrification inhibitor. Moreover, both biochar and nitri-fication inhibitor changed bacterial beta-diversity, and their co-application synergistically enriched Armatimona-detes and Verrucomicrobia abundances and decreased WPS-2 abundance. This study highlights that co -applications of biochar and nitrification inhibitor can make their respective advantages complementary to each other, thereby achieving a larger mitigation of NO emissions from agricultural soils in tropical regions.
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