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首页> 美国卫生研究院文献>Brazilian Journal of Microbiology >Effects of open drainage ditch design on bacterial and fungal communities of cold waterlogged paddy soils
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Effects of open drainage ditch design on bacterial and fungal communities of cold waterlogged paddy soils

机译：明渠设计对冷涝水稻土细菌和真菌群落的影响

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摘要

A field experiment established in 1980 was conducted to evaluate the effects of open drainage ditch applied for water removal on bacterial and fungal communities of cold waterlogged paddy soils in 2011. In this experiment, traditional plate counting and temperature gradient gel electrophoresis were employed to characterize the abundance and diversity of soil bacterial and fungal communities. Four different distances from the open drainage ditch, 5, 15, 25 and 75 m with different degrees of drainage were designed for this study. Maximum populations of culturable aerobic bacteria and fungi were at 15-m distance while minimum populations were at 75-m distance. Significant differences (p < 0.05) in fungal populations were observed at all distances from open drainage ditch. The highest diversity of the bacterial community was found at a distance of 25 m, while that of the fungal community was observed at a distance of 5 m. Sequencing of excised TGGE bands indicated that the dominant bacteria at 75-m distance belonged to anaerobic or microaerobic bacteria. Relationships between microbial characteristics and soil physicochemical properties indicated that soil pH and available nitrogen contents were key factors controlling the abundance of culturable aerobic bacteria and fungi, while soil water capacity also affected the diversity of fungal community. These findings can provide the references for better design and advanced management of the drainage ditches in cold waterlogged paddy soils.
机译：1980年建立了一个野外实验，以评估2011年露天排水沟除水对冷涝稻田细菌和真菌群落的影响。在该实验中，采用传统的平板计数和温度梯度凝胶电泳来表征土壤细菌和真菌群落的丰富度和多样性。本研究设计了距排水排水沟的四个不同距离，5 m，15 m，25 m和75 m，排水程度不同。可培养的需氧细菌和真菌的最大种群在15米的距离，而最小种群在75米的距离。在距开放排水沟的所有距离处均观察到真菌种群的显着差异（p <0.05）。在25 m处发现细菌群落的多样性最高，而在5 m处观察到真菌群落的多样性最高。切除的TGGE带的测序表明，在75-m距离处的优势细菌属于厌氧或微需氧细菌。微生物特征与土壤理化性质之间的关系表明，土壤pH和有效氮含量是控制可培养需氧细菌和真菌丰度的关键因素，而土壤水分容量也影响了真菌群落的多样性。这些发现可为更好地设计和先进管理冷涝稻田排水沟提供参考。

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