鼠茅草套种对不同林龄油茶根际土真菌群落的影响

    Effects of Interplanting with Vulpia myuros on the Fungal Community in Rhizosphere Soil of Camellia oleifera at Different Stand Ages

    • 摘要: 为探究林下套种鼠茅草对不同林龄油茶根际土真菌群落的影响,在覆盖鼠茅草条件和无鼠茅草覆盖条件下分别取3~5年生、10~15年生、50年生及以上的油茶根际土进行高通量测序。结果发现:覆草条件下的根际土微生物多样性更丰富,且50年生及以上林龄的根际土真菌群落多样性指数更高。在科水平上优势菌三形菌Trimorphomycetaceae在10~15年林龄的相对丰度最高;在属水平上优势菌三形菌属Saitozyma在10~15年林龄的相对丰度最高。在油茶根际土真菌群落及林龄相关性分析中陆生壶菌科Terramycetaceae相对丰度与3~5年林龄阶段正相关性最强;锥梗菌科Dissoconiaceae相对丰度与10~15年林龄阶段正相关性最强、黑球腔菌科Melanommataceae相对丰度与50年及以上林龄阶段正相关性最强。腐生菌的功能作用在覆草条件下更强,表明种植鼠茅草能更好地促进土壤养分的转化,从而为油茶的生长提供营养。总而言之,本研究证明了鼠茅草的种植能增加油茶根际土真菌微生物多样性、改善真菌群落的功能、促进油茶的生长发育,且在10~15年生阶段油茶效益最高,为油茶产业的发展提供参考。

       

      Abstract: In order to investigate the effects of interplanting with Vulpia myuros on the fungal community in rhizosphere soil of Camellia oleifera at different stand ages, the rhizosphere soils of Camellia oleifera aged 3-5 years, 10-15 years and 50 years or more were sequenced by using the high-throughput sequencing under or without the condition of covering with Vulpia myuros. The results showed that the microbial diversity of rhizosphere soil was more abundant under the condition of straw mulching, and the diversity index of the fungal community in rhizosphere soil with the stand age of 50 years or more was higher. At the family level, the relative abundance of dominant bacteria Trimorphomycetaceae was the highest at the stand age of 10 to 15 years, while at the genus level, the relative abundance of dominant bacteria Saitozyma was the highest at the stand age of 10 to 15 years. In the correlation analysis of the fungi community in rhizosphere soil of Camellia oleifera and the stand age, the relative abundance of Terramycetaceae had the strongest positive correlation with the stand age of 3 to 5 years. The relative abundance of Dissoconiaceae had the strongest positive correlation with the stand age of 10 to 15 years, while the relative abundance of Melanommataceae had the strongest positive correlation with the stand age of 50 years or more. The functional effect of saprophytic bacteria was stronger under the condition of straw mulching, which indicated that the cultivation of Vulpia myuros could better promote the transformation of soil nutrients, thus to provide the nutrition for the growth of Camellia oleifera. In conclusion, this study proved that the cultivation of Vulpia myuros could increase the microbial diversity of fungi in the rhizosphere soil of Camellia oleifera, improve the function of fungal community, and promote the growth and development of Camellia oleifera, and the benefit of Camellia oleifera was the highest when planted for 10 to 15 years, which would provide reference for the development of Camellia oleifera industry.

       

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