不同种植模式对栝楼根际土壤微生物群落多样性的影响

Effects of different planting patterns on microbial community diversity in rhizosphere soil of Trichosanthes kirilowii Maxim

  • 摘要: 【目的】分析不同种植模式对栝楼根际土壤理化性质和土壤微生物群落多样性的影响,为探索合理有效的栝楼连作障碍消减策略提供理论依据。【方法】设连作(对照)、连作—翻耕—种植新苗和栝楼—水稻轮作3种种植模式,测定不同种植模式下栝楼根际土壤理化性质及土壤微生物群落结构和多样性并对比其差异,采用典型相关分析探明土壤理化性质与微生物群落结构的相关性。【结果】栝楼—水稻轮作和连作—翻耕—种植新苗2种模式下,栝楼根际土壤有机碳、全氮、全磷、碱解氮和速效磷含量显著高于对照(P<0.05,下同)。高通量测序结果表明,连作—翻耕—种植新苗模式能显著增加栝楼根际土壤细菌群落多样性和丰度,但真菌群落丰度和多样性与对照无显著差异(P>0.05),栝楼主要致病相关真菌属壳多孢菌属(Stagonosporopsis)和炭疽菌属(Colletotrichum)的相对丰度仍保持在较高水平;栝楼—水稻轮作模式可显著降低土壤真菌群落丰度和多样性,降低壳多孢菌属和炭疽菌属等有害真菌属相对丰度。典型相关分析结果表明,不同种植模式下土壤微生物群落存在明显差异,土壤有机碳含量、全氮、全磷、全钾、碱解氮、速效钾和速效磷含量能显著影响栝楼根际土壤细菌和真菌物种分布。【结论】栝楼—水稻轮作能提高土壤质量,降低土壤真菌群落丰度和多样性,降低有害真菌属相对丰度,该种植模式对栝楼连作障碍的缓解效果优于连作—翻耕—种植新苗模式。

     

    Abstract: 【Objective】The effects of different planting patterns on soil physicochemical properties and the diversity of microbial communities in the rhizosphere soil of Trichosanthes kirilowii Maxim were analyzed to provide a theoretical basis for exploring reasonable and effective strategies to reduce the continuous cropping obstacles of T. kirilowii. 【Method】Continuous cropping(control),continuous cropping-tillage-planting new seedlings and T. kirilowii-rice rotation were set to determine and compare the soil physicochemical properties and microbial community structure and diversity. The correlation between soil physicochemical properties and microbial community structure was also explored by canonical correlation analysis. 【Result】Under T. kirilowii-rice rotation and continuous cropping-tillage-planting new seedlings, contents of organic carbon,total nitrogen,total phosphorus,alkaline nitrogen,available phosphorus in the rhizosphere of T. kirilowii were significantly higher than control(P<0.05, the same below). The results of high-throughput sequencing showed that continuous cropping-tillage-planting new seedlings pattern could significantly increase the diversity and abundance of bacterial community in the rhizosphere soil,but abundance and diversity of fungal community was not significantly different from control(P>0.05), and the relative abundance of important pathogenic fungi(Stagonosporopsis and Colletotrichum)remained at a high level. T. kirilowii-rice rotation could significantly reduce the abundance and diversity of soil fungal communities and the relative abundance of harmful fungi(Stagonosporopsis and Colletotrichum). The results of canonical correlation analysis showed that there were obvious differences in soil microbial communities under different planting patterns. The contents of soil organic carbon,total nitrogen,total phosphorus, total potassium,alkaline nitrogen,available potassium and available phosphorus could significantly affect the distribution of bacterial and fungal species in the rhizosphere soil of T. kirilowii. 【Conclusion】T. kirilowii-rice rotation can increase soil quality,reduce the abundance and diversity of soil fungal communities,and reduce the relative abundance of harmful fungi. The planting patterns is superior to continuous cropping-tillage-planting new seedlings in reducing the continuous cropping obstacles of T. kirilowii.

     

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