文献类型： 外文期刊

作者： Cao, Miaomiao ¹ ; Li, Yong ¹ ; Zhang, Yuxuan ¹ ; Yu, Debang ² ; Uwiragiye, Yves ¹ ; Wang, Jing ² ; Jing, Hang ¹ ; Tang, Quan ³ ; Qian, Yinfei ¹² ; Elrys, Ahmed S. ⁴ ; Cheng, Yi ¹ ; Cai, Zucong ¹ ; Xu, Minggang ⁷ ; Mueller, Christoph ⁹ ;

作者机构： 1.Nanjing Normal Univ, Sch Geog, Nanjing 210023, Peoples R China

2.Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China

3.Yangzhou Univ, Coll Environm Sci & Engn, Yangzhou 225009, Peoples R China

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

5.Jiangsu Ctr Collaborat Innovat Geog Informat Resou, Nanjing 210023, Peoples R China

6.Nanjing Normal Univ, Key Lab Virtual Geog Environm, Minist Educ, Nanjing 210023, Peoples R China

7.Shanxi Agr Univ, Engineer & Technol Acad Ecol & Environm, Shanxi Prov Key Lab Soil Environm & Nutrient Reso, Taiyuan 030031, Peoples R China

8.Chinese Acad Agr Sci CAAS, Key Lab Arable Land Qual Monitoring & Evaluat, State Key Lab Efficient Utilizat Arid & Semiarid A, Minist Agr & Rural Affairs,Inst Agr Resources & Re, Beijing 100081, Peoples R China

9.Justus Liebig Univ Giessen, Inst Plant Ecol, D-35392 Giessen, Germany

10.Univ Coll Dublin, Earth Inst, Sch Biol & Environm Sci, Dublin, Ireland

11.Justus Liebig Univ Giessen, Liebig Ctr Agroecol & Climate lmpact Res, D-35392 Giessen, Germany

12.Jiangxi Acad Agr Sci, Soil & Fertilizer & Resources & Environm Inst, Nanchang 330200, Peoples R China

关键词： Soil pH; Nitrogen addition; Autotrophic nitrification; Heterotrophic nitrification

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.4； 五年影响因子：6.8 ）

ISSN： 0167-8809

年卷期： 2025 年 377 卷

页码：

收录情况： SCI

摘要： Autotrophic (AN) and heterotrophic (HN) nitrification pathways regulate soil nitrogen availability and are responsible for nitrate losses to the environment. It is often assumed that HN plays a more important role than AN in acidic soils. However, so far, no detailed study has attempted to identify how pH affects the relative importance of gross rates of AN (GAN) and HN (GHN) in acidic soils. Combining N-15 dilution technique with acetylene inhibition along a natural soil pH gradient of 3.7-6.9, we revealed a negative exponential relationship between GHN/GAN ratio and soil pH, with a threshold of pH=4.5 =4.5 and 4.7 with and without the addition of ammonium, respectively. Variations of fungal and ammonia-oxidizing archaea (AOA) abundances along the pH gradient further confirmed the existence of this threshold. Soil nitrification was predominantly fungi-driven HN below the threshold and AOA-driven AN above the threshold. Overall, we provide evidence that a pH threshold controls the dominant nitrification pathway in acidic soils by affecting specific microbes, which could be important for predicting soil nitrification patterns and developing effective mitigation techniques to promote nitrogen availability and decrease nitrogen loss risk.