毛竹纯林土壤微生物多样性高于杉木纯林

杉木连作障碍现象普遍发生，同为人工林的毛竹则很少发生。作为土壤健康的重要指标，微生物对土壤肥力具有不可忽视的作用。采用高通量测序法对阔叶、毛竹和杉木三种林分的土壤细菌和真菌群落进行研究，结果表明，毛竹林土壤细菌和真菌Shannon多样性和Invsimpson均匀度指数均显著高于杉木林，甚至高于阔叶林；而优势物种多样性Berger-Parker指数则是杉木显著高于毛竹林；毛竹林土壤Actinobacteria门细菌相对丰度高于阔叶林和杉木林、Basidiomycota门真菌相对丰度显著高于阔叶林和杉木林，杉木林土壤Chloroflexi门细菌相对丰度和Mortierellomycota门真菌相对丰度显著高于毛竹林和阔叶林。结合土壤理化性质分析表明，杉木林土壤养分贫瘠是形成其特殊微生物群落的原因之一，而毛竹林土壤丰富的养分和高pH有利于形成良好微生物群落结构。与杉木相比，毛竹林土壤细菌和真菌特征以及土壤理化性质与阔叶的相似度更高。

Soil Microbial Diversity is Higher in Pure Stands of Moso Bamboo than in Pure Stands of Chinese Fir

Objective It is a common phenomenon for most of the artificial Chinese Fir Forests (CF) to have continuous cropping obstacles, while the Moso bamboo forest (MB) rarely does. As an important indicator of soil health, soil fertility has a non-negligible effect on microorganisms.Method Our study used high-throughput sequencing to analyze the soil bacterial and fungal communities in three different forest stands.Result The results showed that both the Shannon index and Invsimpson index of soil bacteria and fungi in MB were significantly higher than those of CF and even higher than that of Broadleaf forest (BL); while the Berger-Parker index in CF was significantly higher than that in MB. The relative abundances of Actinobacteria and Basidiomycotawas in MB were higher than that in BL and CF, while the relative abundances of Chloroflexi and Mortierellomycota in CF were significantly higher than that of MB and BL.Conclusion Combined with the analysis of soil physicochemical properties, it was shown observed that the nutrient content of the studied soils played a very significant role in influencing the microbial community structure, Moreover, MB had a conductive environment for the formation of a good microbial community structure compared to the other soils. It was concluded that the soil bacterial and fungal characteristics and soil physicochemical properties of MB stands were more similar to those of broadleaf than to those of CF.