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Article

Environmental Factors, More Than Spatial Distance, Explain Community Structure of Soil Ammonia-Oxidizers in Wetlands on the Qinghai–Tibetan Plateau

by 1,2,†, 1,3,†, 1,4,5, 1, 1,2,6,* and 1,2,6,*
1
CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
2
Hubei Key Laboratory of Wetland Evolution & Ecological Restoration, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
3
College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
4
Research Center for Ecology and Environment of Qinghai–Tibetan Plateau, Tibet University, Lhasa 850000, China
5
College of Science, Tibet University, Lhasa 850000, China
6
Center for Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan 430074, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Microorganisms 2020, 8(6), 933; https://doi.org/10.3390/microorganisms8060933
Received: 26 April 2020 / Revised: 8 June 2020 / Accepted: 18 June 2020 / Published: 21 June 2020
(This article belongs to the Special Issue Wetland Soil Microbiology)
In wetland ecosystems, ammonia oxidation highly depends on the activity of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB), which are, therefore, important for studying nitrogen cycling. However, the ammonia-oxidizer communities in the typical high-elevation wetlands are poorly understood. Here, we examined ammonia-oxidizer communities in soils from three wetland types and 31 wetland sites across the Qinghai–Tibetan Plateau. The amoA gene of AOA and AOB was widespread across all wetland types. Nitrososphaera clade (Group I.1b) overwhelmingly dominated in AOA community (90.36%), while Nitrosospira was the principal AOB type (64.96%). The average abundances of AOA and AOB were 2.63 × 104 copies g−1 and 9.73 × 103 copies g−1. The abundance of AOA amoA gene was higher in riverine and lacustrine wetlands, while AOB amoA gene dominated in palustrine wetlands. The environmental conditions, but not spatial distance, have a dominant role in shaping the pattern of ammonia-oxidizer communities. The AOA community composition was influenced by mean annual temperature (MAT) and mean annual precipitation (MAP), while MAT, conductivity and plant richness, pH, and TN influenced the AOB community composition. The net nitrification rate had a significant correlation to AOB, but not AOA abundance. Our results suggest a dominant role for climate factors (MAT and MAP) in shaping community composition across a wide variety of wetland sites and conditions. View Full-Text
Keywords: nitrification; the Qinghai–Tibet Plateau; high-elevation wetland; microbial community structure nitrification; the Qinghai–Tibet Plateau; high-elevation wetland; microbial community structure
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MDPI and ACS Style

Zhou, W.; Jiang, X.; Ouyang, J.; Lu, B.; Liu, W.; Liu, G. Environmental Factors, More Than Spatial Distance, Explain Community Structure of Soil Ammonia-Oxidizers in Wetlands on the Qinghai–Tibetan Plateau. Microorganisms 2020, 8, 933. https://doi.org/10.3390/microorganisms8060933

AMA Style

Zhou W, Jiang X, Ouyang J, Lu B, Liu W, Liu G. Environmental Factors, More Than Spatial Distance, Explain Community Structure of Soil Ammonia-Oxidizers in Wetlands on the Qinghai–Tibetan Plateau. Microorganisms. 2020; 8(6):933. https://doi.org/10.3390/microorganisms8060933

Chicago/Turabian Style

Zhou, Wen, Xiaoliang Jiang, Jian Ouyang, Bei Lu, Wenzhi Liu, and Guihua Liu. 2020. "Environmental Factors, More Than Spatial Distance, Explain Community Structure of Soil Ammonia-Oxidizers in Wetlands on the Qinghai–Tibetan Plateau" Microorganisms 8, no. 6: 933. https://doi.org/10.3390/microorganisms8060933

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