Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No.298 Chuangyou Road, Nanjing 211135, China; School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK; University of Chinese Academy of Sciences, No.188, Tianquan Road, Nanjing 211135, China.
Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No.298 Chuangyou Road, Nanjing 211135, China; University of Chinese Academy of Sciences, No.188, Tianquan Road, Nanjing 211135, China.
Water Res. 2024 Nov 1;265:122259. doi: 10.1016/j.watres.2024.122259. Epub 2024 Aug 13.
As a pervasive microbial aggregate found at the water-soil interface in paddy fields, periphyton plays crucial roles in modulating nutrient biogeochemical cycling. Consequently, it effectively mitigates non-point source pollution due to its diverse composition. Despite its significance, the mechanisms governing periphyton diversity across different rice planting regions remain poorly understood. To bridge this gap, we investigated periphyton grown in 200 paddy fields spanning 25° of latitude. Initially, we analyzed local diversity and latitudinal variations in prokaryotic communities within paddy field periphyton, identifying 7 abundant taxa, 42 moderate taxa, and 39 rare taxa as the fundamental prokaryotic framework. Subsequently, to elucidate the mechanisms governing periphyton diversity across large scales, we constructed interaction models illustrating triangular relationships among local richness, assembly, and regional variation of prokaryotic subcommunities. Our findings suggest that accumulated temperature-driven environmental filtering partially influences the assembly process of prokaryotes, thereby impacting local species richness and ultimately governing regional structural variations in periphyton. Furthermore, we determined that a latitude of 39° represents the critical threshold maximizing local species richness of periphyton in paddy fields. This study advances our understanding of the factors shaping periphyton geo-imprints and provides valuable insights into predicting their responses to environmental changes, potentially influencing rice production outcomes.
作为稻田水-土界面普遍存在的微生物聚集体，周丛生物在调节养分生物地球化学循环方面起着至关重要的作用。因此，由于其多样的组成，它有效地减轻了非点源污染。尽管它很重要，但不同水稻种植区周丛生物多样性的控制机制仍知之甚少。为了弥补这一空白，我们调查了跨越 25 个纬度的 200 个稻田中生长的周丛生物。首先，我们分析了稻田周丛生物中细菌群落的局部多样性和纬度变化，确定了 7 个丰富类群、42 个中等类群和 39 个稀有类群作为基本细菌框架。随后，为了阐明大尺度上周丛生物多样性的控制机制，我们构建了相互作用模型，说明了细菌亚群的局部丰富度、组装和区域变化之间的三角关系。我们的研究结果表明，积累的温度驱动的环境过滤部分影响了细菌的组装过程，从而影响了局部物种丰富度，并最终控制了周丛生物的区域结构变化。此外，我们确定 39°的纬度代表了最大化稻田周丛生物局部物种丰富度的关键阈值。这项研究提高了我们对塑造周丛生物地理印记的因素的理解，并为预测它们对环境变化的响应提供了有价值的见解，这可能会影响水稻生产的结果。
