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The regulatory mechanism controlling nitrification inhibitors-induced mitigation of nitrification and NO3--N leaching in alkaline purple soil

文献类型： 外文期刊

作者： Liu, Fabo 1 ; Lakshmanan, Prakash 2 ; Zou, Wenxin 1 ; Lang, Ming 1 ; Li, Zhao Lei 1 ; Zhang, Fen 1 ; Liang, Tao 7 ; Chen, Jing 7 ; Wang, Yan 7 ; Wang, Xiaozhong 1 ; Chen, Xinping 1 ;

作者机构： 1.Southwest Univ, Acad Agr Sci, Coll Resources & Environm, Chongqing 400716, Peoples R China

2.Southwest Univ, Interdisciplinary Res Ctr Agr Green Dev Yangtze Ri, Chongqing 400716, Peoples R China

3.Guangxi Acad Agr Sci, Sugarcane Res Inst, Guangxi Key Lab Sugarcane Genet Improvement, Nanning 530007, Peoples R China

4.Univ Queensland, Queensland Alliance Agr & Food Innovat, St Lucia, Qld 4067, Australia

5.Southwest Univ, Chongqing Key Lab Efficient Utilizat Soil & Fertil, Chongqing 400716, Peoples R China

6.Southwest Univ, Key Lab Low carbon Green Agr Southwestern China, Minist Agr & Rural Affairs, Chongqing 400716, Peoples R China

7.Chongqing Acad Agr Sci, Chongqing 400000, Peoples R China

关键词： Nitrification inhibitors; Ammonia oxidizers; Vegetable; Purple soil

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.4； 五年影响因子：8.6 ）

ISSN： 0301-4797

年卷期： 2025 年 375 卷

页码：

收录情况： SCI

摘要： Nitrification inhibitors (NIs) are critical to reduce nitrogen (N) leaching losses. However, the efficacy of different NIs can be highly variable across soils and crop types, and a deeper understanding of the mechanistic basis of this efficiency variation, especially in purple soil under vegetable production, is lacking. To enrich this knowledge gap, the impact of different NIs amendment (3,4-dimethylpyrazole phosphate, DMPP; dicyandiamide, DCD; nitrapyrin, NP) on nitrification and the microbial mechanistic basis of controlling nitrate (NO3--N) leaching of vegetable purple soil was explored in southwest China. The results showed that DCD and NP effect is dosedependent, with 10% DCD, 1% DMPP and 1% NP were found to be optimal for nitrification inhibition in vegetable purple soil. When compared with the control treatment without NIs amendments, DCD, DMPP and NP reduced NO3--N leaching by 26.3%, 30.6% and 19.2%, respectively. It was noteworthy that NO3--N leaching inhibition was mediated predominantly by inhibiting ammonia-oxidizing bacteria (AOB) abundance. DCD, NP and DMPP incorporation decreased the AOB abundance by 39.8%, 73.2% and 51.4% and suppressed the ammonia monooxygenase (AMO) activity by 22.2%, 36.8% and 28.7%, respectively, in comparison with the control treatment without NIs amendments. DMPP inhibited AOB abundance and AMO activity much more than DCD and NP. DMPP also significantly decreased AOB alpha diversity and altered their community structure, whereas DCD and NP had no significant effect. The mantel test indicated that AOB abundance and AMO activity are strongly correlated with NO3--N leaching rate. These results show that soil application of 1% DMPP effectively mitigates NO3--N leaching from sub-tropical alkaline purple vegetable soil. This study also expanded our mechanistic understanding of NO3--N leaching and its regulators in an alkaline soil vegetable production system with N fertilizer and NI inputs.

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