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Enhanced mitigation of N2O and NO emissions through co-application of biochar with nitrapyrin in an intensive tropical vegetable field

文献类型： 外文期刊

作者： Fan, Changhua 1 ; Leng, Youfeng 1 ; Wang, Xiaotong 1 ; Wang, Junjiao 1 ; Fu, Yajun 1 ; Huang, Xiaomin 1 ; Gao, Wenlong 1 ; Zhang, Wen 1 ; Liu, Huiran 1 ; Ning, Ziyu 1 ; Li, Qinfen 1 ; Chen, Miao 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Key Lab Low Carbon Green Agr Trop Reg China, Minist Agr & Rural Affairs,Hainan Danzhou Trop Ag, Danzhou 571737, Peoples R China

2.Hainan Danzhou Trop Agroecosyst Natl Observat &, Danzhou 571737, Peoples R China

3.Hainan Key Lab Trop Ecocircular Agr, Haikou 571101, Peoples R China

4.Hainan Univ, Coll Ecol & Environm, Haikou 570228, Peoples R China

5.Hainan Univ, Coll Trop Crops, Haikou 570228, Peoples R China

6.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China

7.Chinese Acad Trop Agr Sci, Haikou 571101, Hainan, Peoples R China

关键词： Gaseous nitrogen (N) emission; Biochar; Nitrification inhibitor; Tropical vegetable ecosystem

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.6； 五年影响因子：6.7 ）

ISSN： 0167-8809

年卷期： 2024 年 365 卷

页码：

收录情况： SCI

摘要： Vegetable fields in tropical regions characterized by intensive cultivation have the potential to be significant sources of gaseous nitrogen (N) emissions. This is primarily due to human-induced input of N fertilizer and the naturally abundant water and heat resources in these areas. While biochar and nitrification inhibitors are recognized as effective measures for mitigating soil nitrous oxide (N2O) and nitric oxide (NO) emissions, there is limited research on their combined effectiveness in intensively managed tropical croplands. In a 2-year field experiment conducted in a tropical vegetable ecosystem, we investigated the impact of single and combined applications of peanut biochar and nitrapyrin (a nitrification inhibitor) on N2O and NO emissions, N-cycling associated gene abundances, and bacterial community structure. Under conventional fertilization, cumulative N2O and NO emissions were 1.96 kg N ha(-1) yr(-1) and 1.76 kg N ha(-1) yr(-1), with emission factors of N fertilizer for N2O (EFN2O) and NO (EFNO) at 0.29% and 0.30%, respectively. The random forest model indicated that soil organic carbon (SOC) was key in regulating N2O+NO emissions. Biochar alone decreased cumulative N2O and NO emissions by 6.1 % and 13.0 %, respectively. When biochar was co-applied with nitrapyrin, the mitigation of N2O and NO reached up to 23.4 % and 18.6 %, respectively. This enhanced effect was attributed to the strong inhibitory impact of nitrapyrin on nitrifiers (AOA and AOB) and denitrifiers (nirK/S) in biochar-amended soils. Additionally, biochar co-application increased SOC levels in nitrapyrin-applied soils. Analysis of bacterial community structure revealed that nitrapyrin decreased the relative abundance of Nitrospirae, while biochar increased the relative abundance of Acidobacteria, Chloroflexi, Gemmatimonadetes and Nitrospirae to varying extents. Considering the carbon sequestration ability of biochar and the effective mitigation potential of nitrapyrin, the combined application of biochar with a nitrification inhibitor emerges as a promising strategy for dual objectives - reducing gaseous N emissions and enhancing soil carbon storage - in intensive vegetable ecosystems in the tropical region of China.

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