CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, People's Republic of China.
Microb Ecol. 2023 Jul;86(1):485-496. doi: 10.1007/s00248-022-02076-8. Epub 2022 Jul 16.
The assembly mechanisms shaping the elevational patterns of diversity and community structure in ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) are not well understood. We investigated the diversities, co-occurrence network patterns, key drivers, and potential activities of AOA and AOB communities along a large altitudinal gradient. The α-diversity of the AOA communities exhibited a monotonically decreasing pattern with increasing elevation, whereas a sinusoidal pattern was observed for the AOB communities. The mean annual temperature was the single factor that most strongly influenced the α-diversity of the AOA communities; however, the interactions of plant richness, soil conductivity, and total nitrogen made comparable contributions to the α-diversity of the AOB communities. Moreover, the β-diversities of the AOA and AOB communities were divided into two distinct clusters by elevation, i.e., low- (1800-2600 m) and high-altitude (2800-4100 m) sections. These patterns were attributed mainly to the soil pH, followed by variations in plant richness along the altitudinal gradient. In addition, the AOB communities were more important to the soil nitrification potential in the low-altitude section, whereas the AOA communities contributed more to the soil nitrification potential in the high-altitude section. Overall, this study revealed the key factors shaping the elevational patterns of ammonia-oxidizing communities and might predict the consequences of changes in ammonia-oxidizing communities.
目前，我们对于塑造氨氧化古菌（AOA）和氨氧化细菌（AOB）海拔分布模式和群落结构的组装机制还知之甚少。本研究沿大海拔梯度调查了 AOA 和 AOB 群落的多样性、共现网络模式、关键驱动因素和潜在活性。AOA 群落的 α 多样性随海拔升高呈单调递减模式，而 AOB 群落则呈正弦模式。年均温度是影响 AOA 群落 α 多样性的唯一主要因素；然而，植物丰富度、土壤电导率和总氮的相互作用对 AOB 群落的 α 多样性也有相当大的贡献。此外，AOA 和 AOB 群落的 β 多样性可根据海拔分为两个不同的集群，即低海拔（1800-2600 m）和高海拔（2800-4100 m）部分。这些模式主要归因于土壤 pH 值，其次是沿海拔梯度的植物丰富度变化。此外，AOB 群落对低海拔部分土壤硝化潜力更为重要，而 AOA 群落对高海拔部分土壤硝化潜力的贡献更大。总体而言，本研究揭示了塑造氨氧化群落海拔分布模式的关键因素，并可能预测氨氧化群落变化的后果。
