不同连栽代次桉树人工林土壤真菌群落结构和多样性研究

Structure and Diversity of Soil Fungal Communities Under Successive Rotations of Eucalyptus

为了研究不同连栽代次桉树人工林土壤真菌群落结构和多样性的变化,选取广西七坡林场不同连栽代次桉树人工林作为研究对象,在调查9项化学指标基础上,应用高通量测序平台、冗余分析对不同连栽代次桉树人工林土壤真菌多样性进行研究。结果表明:多代连栽经营模式对土壤化学性质及真菌群落产生显著影响。连栽模式引起土壤养分含量、真菌多样性及丰富度在第2代桉树人工林显著升高后,在第3代和第4代人工林土壤中显著下降。同时,多代连栽导致真菌群落结构的显著变化,第3、4代人工林土壤优势真菌担子菌门相对丰度显著下降,而子囊菌门相对丰度显著升高。速效钾和硝态氮作为土壤关键因子驱动土壤真菌群落结构的演变过程。

This study examined changes of soil fungal community structure and diversity in Eucalyptus plantations over successive rotations in Qipo Forest Farm,Guangxi.The soil fungal communities and their diversity were analysed using a high-throughput sequencing platform and redundancy analysis to evaluate nine chemical indicators.The results showed that multiple successive rotations had significant effects on soil chemical properties and fungal communities.Successive rotations caused a significant increase in nutrient content,fungal diversity and richness in the soil of second rotation Eucalyptus plantations,followed by a significant decrease in these soil parameters in the third and fourth rotations.At the same time,multiple successive rotations led to significant changes in fungal community structures,with the relative abundance of the dominant fungal phylum Basidiomycota decreasing significantly and the relative abundance of phylum Ascomycota increasing significantly in the soils by the third and fourth rotation of Eucalyptus.The development and changes in soil fungal community structure appeared to be driven by the key soil factors of available potassium and nitrate nitrogen.