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北京大学城市与环境学院陆雅海教授课题组调查了中国东部不同的生境和区域相邻的玉米田（水不饱和）和水稻田（水饱和）中古菌、细菌和真菌群落的构成。相关成果发表于 The ISME Journal（IF=9.664）。
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Abstract
Revealing the linkages between community assembly and species coexistence, which is crucial for the understanding of ecosystem diversity and functioning, is a fundamental but rarely investigated subject in microbial ecology. Here we examined archaeal, bacterial, and fungal community assembly in adjacent pairs of maize (water-unsaturated) and rice (water-saturated) fields across different habitats and regions throughout Eastern China. The high-throughput sequencing dataset was analyzed by variation partitioning, null model, and neutral community model analyses. We demonstrated that microbial community assembly was governed more by species sorting than by dispersal limitation in maize fields, and to a lesser extent in rice fields. The relative importance of species sorting in maize soils was greater at low latitudes than at high latitudes, while rice soils exhibited an opposite trend. Microbial co-occurrence associations tended to be higher when communities were primarily driven by dispersal limitation relative to species sorting. There were greater community dissimilarities between maize and rice soils in low-latitude regions, which was consistent with the higher proportion of negative edges in the correlation networks. The results indicate that a balance between species sorting and dispersal limitation mediates species coexistence in soil microbiomes. This study enhances our understanding of contemporary coexistence theory in microbial ecosystems.
群落构成和物种共生之间的联系是了解生态系统多样性及其功能的关键，是微生物生态学研究的一个基础问题，但对其所做的研究还很少。本研究调查了中国东部不同的生境和区域相邻的玉米田（水不饱和）和水稻田（水饱和）中古菌、细菌和真菌群落的构成。通过变异划分、无效模型和中性群落模型分析了高通量测序数据集。结果表明，在玉米田中，微生物群落的组成主要由物种配置主导，而非扩散限制；而在水稻田中，微生物群落的组成受物种配置的限制较小。玉米田土壤中物种配置的相对重要性在低纬度地区大于高纬度地区，而水稻田土壤则表现出相反的趋势。当扩散限制对于群落的驱动力高于物种配置时，微生物的共生关系往往更高。在低纬度地区，玉米田和水稻田土壤的群落构成差异较大，这与相关网络中负边缘比例较高有关。研究结果表明，物种配置和扩散限制之间的平衡影响着土壤微生物群落中物种共存。本研究增进了对微生物生态系统中当代物种共存理论的理解。
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