Abstract
Nitrification in soils is an essential process that involves archaeal and bacterial ammonia-oxidizers. Despite its importance, the relative contributions of soil factors to the abundance of ammonia-oxidizing archaea (AOA) and bacteria (AOB) and their nitrification performances are seldom discussed. The aim of this study was to determine the effects of AOA and AOB abundance and different environmental conditions (pH, TC, TN, moisture, and temperature) on nitrification performance. The soils of the long-term fertilized tea orchards and forests were sampled in the field, and nitrification experiments were conducted in the laboratory. The acid soils were collected from the field and used in laboratory incubation experiments to calculate the nitrification rate, including the net nitrification rate (NN rate), nitrification potential (NP), and nitrification kinetics. The basic parameters, different forms of nitrogen content, and AOA and AOB amoA gene copies were also analyzed. Compared with the forest soil, the tea orchard soil had a lower pH and higher nitrogen content (p < 0.05). The AOA and AOB abundance in the soils of the forests and tea orchards were pH-dependent. The NN rate and NP had good relationships with AOA or AOB in the forest soil; however, poor relationships were observed in the tea orchard soil. When pH < 4, the performances of AOA and AOB were restricted by pH and the environment, especially in long-term fertilized farmlands. Long-term fertilization can cause soil acidification, which regulates the abundance of AOA and AOB and their nitrifying ability. The soil environment rather than AOA or AOB could control nitrification in long-term fertilized farmlands with a pH below 4. These findings could improve fertilization efficiency and control nutrient runoff in hilly agricultural ecosystems.
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Acknowledgements
This study was funded by the Applied Science and Technology Research and Development Project of Guangdong Province, China (Grant No. 2017B020236001), the General Program of National Natural Science Foundation of China (Grant No.41877470), and the General Program of the National Natural Science Foundation of China (Grant No.42077154). We thank Zewen Pan, Jiaqi Zhu, Lu Yao, Xinyu Zhu, Yujie Zhao, Guihong Huang, Yu Zhang, Xue Li, Jing Wen, Shuyan Wang, Jianhua Lai, and Shuo Li for their assistance with sampling and testing work in the field and laboratory. We are grateful to the journal editor and three anonymous reviewers for their thoughtful and insightful comments and suggestions in this manuscript.
Funding
This study was funded by the Applied Science and Technology Research and Development Project of Guangdong Province, China (Grant No. 2017B020236001), the General Program of National Natural Science Foundation of China (Grant No.41877470), and the General Program of the National Natural Science Foundation of China (Grant No.42077154).
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Huijun Ye: conceptualization, methodology, software, validation, investigation, formal analysis, writing—original draft, and writing—review and editing. Changyuan Tang: validation, resources, writing—review and editing, supervision, project administration, and funding acquisition. Yingjie Cao: conceptualization, methodology, validation, resources, writing—review and editing, visualization, supervision, project administration, funding acquisition, and data curation. Xing Li: methodology, formal analysis, and writing—review and editing. Pinyi Huang: investigation and formal analysis.
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Ye, H., Tang, C., Cao, Y. et al. Contribution of ammonia-oxidizing archaea and bacteria to nitrification under different biogeochemical factors in acidic soils. Environ Sci Pollut Res 29, 17209–17222 (2022). https://doi.org/10.1007/s11356-021-16887-8
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DOI: https://doi.org/10.1007/s11356-021-16887-8