Sun Pengfei, Silvano Eleonora, Chen Yin, Wu Yonghong
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China.
School of Life Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom.
ISME Commun. 2024 Oct 10;4(1):ycae119. doi: 10.1093/ismeco/ycae119. eCollection 2024 Jan.
Periphytons serve as critical microbial nutrient sinks at the soil-water interface, influencing biogeochemical cycles and nutrient migration in paddy fields. Despite their importance, the impact of accumulated intracellular nutrients on the spatial dynamics and community assembly of periphytons, particularly their microeukaryote communities, remains unclear. To address this gap, we examined the nutrient accumulation potential and its effects on microeukaryotes in periphytons from 220 paddy fields spanning up to 3469 km across three temperature zones. Our study reveals that the periphytons exhibit varying capacities to accumulate carbon, nitrogen, and phosphorus, leading to imbalanced intracellular nutrient stoichiometries (carbon-to-nitrogen ratio = 10.3 ± 2.1, carbon-to-phosphorus ratio = 30.9 ± 13.1, nitrogen-to-phosphorus ratio = 3.1 ± 1.3). This stoichiometric imbalance induces intracellular environmental heterogeneity, which partially influences the local species richness of microeukaryotic communities and their regional structural variations on a large scale. Contrary to the typical latitudinal diversity gradient theory, local microeukaryotic species richness follows a distance-decay model, with both deterministic and stochastic processes contributing to community assembly. These results underscore the complex interplay of environmental filtering, species interactions, and dispersal dynamics in shaping the structure and adaptability of microeukaryotic communities within periphytons. This study contributes to a broader understanding of the factors driving regional structural variations of microeukaryotes at the soil-water interface in agricultural landscapes.
周丛生物作为土壤 - 水界面重要的微生物养分库，影响着稻田的生物地球化学循环和养分迁移。尽管其重要性不言而喻，但细胞内积累的养分对周丛生物，尤其是其微型真核生物群落的空间动态和群落组装的影响仍不清楚。为填补这一空白，我们研究了横跨三个温度带、跨度达3469公里的220个稻田中周丛生物的养分积累潜力及其对微型真核生物的影响。我们的研究表明，周丛生物积累碳、氮和磷的能力各不相同，导致细胞内养分化学计量失衡（碳氮比 = 10.3 ± 2.1，碳磷比 = 30.9 ± 13.1，氮磷比 = 3.1 ± 1.3）。这种化学计量失衡引发了细胞内环境异质性，部分影响了微型真核生物群落的局部物种丰富度及其大规模的区域结构变化。与典型的纬度多样性梯度理论相反，局部微型真核生物物种丰富度遵循距离衰减模型，确定性和随机性过程都对群落组装有贡献。这些结果强调了环境过滤、物种相互作用和扩散动态在塑造周丛生物中微型真核生物群落结构和适应性方面的复杂相互作用。本研究有助于更广泛地理解驱动农业景观土壤 - 水界面微型真核生物区域结构变化的因素。
