Bureau of Ecology and Environment of Naqu City, Tibet Autonomous Region, Lhasa, China.
Tibet University, Lhasa, China.
PLoS One. 2022 Jul 11;17(7):e0271101. doi: 10.1371/journal.pone.0271101. eCollection 2022.
The distribution pattern of the microbial community in mountains is an important component of biodiversity research. Many environmental factors vary significantly with elevation on a relatively small scale in subalpine and alpine environments. These factors may markedly affect microbial community composition and function. In this study, we analyzed phospholipid fatty acid (PLFA) profiles and phosphorus (P) fractions in soils from 9 sites along an elevation gradient (3500-4100 m above sea level (a.s.l.)) of the Shergyla Mountain, Tibet in China. Many biomarker PLFAs indicated that there were biogeochemical trends of the microbial distribution patterns of some soil microorganisms, which were most often increasing, U-shaped and unimodal trends along the elevation gradient. A redundancy analysis (RDA) and correlations indicated that P factors (e.g., Resin-Pi, NaHCO3-Pi and NaHCO3-Po) were more important in controlling the microbial PLFA distribution pattern than other factors (e.g., MAT, MAP, pH, TOC, TN and soil moisture) in this study area. Microorganisms are strongly associated with P fractions. Our results suggested that microbial communities were subjected to P stresses and that the distribution patterns of microbial communities were shaped by bioavailable P along the elevation gradient. Our work also hints that P geochemical processes drive the microbial diversity of the Shergyla Mountains.
山地微生物群落的分布格局是生物多样性研究的重要组成部分。在亚高山和高山环境中，许多环境因素在相对较小的范围内随海拔高度显著变化。这些因素可能显著影响微生物群落的组成和功能。本研究分析了中国西藏色季拉山海拔梯度（3500-4100 米）9 个地点土壤中的磷脂脂肪酸（PLFA）谱和磷（P）分数。许多生物标志物 PLFA 表明，一些土壤微生物的微生物分布模式存在生物地球化学趋势，这些趋势通常沿着海拔梯度呈增加、U 型和单峰趋势。冗余分析（RDA）和相关性表明，在本研究区，P 因子（如树脂 Pi、NaHCO3-Pi 和 NaHCO3-Po）比其他因子（如 MAT、MAP、pH、TOC、TN 和土壤水分）更能控制微生物 PLFA 分布模式。微生物与 P 分数密切相关。我们的结果表明，微生物群落受到 P 胁迫的影响，微生物群落的分布模式是由沿海拔梯度的可利用 P 塑造的。我们的工作还表明，P 地球化学过程驱动了色季拉山的微生物多样性。
