Effects of continuous cropping on fungal community structure succession in non-rhizosphereand and rhizosphere soils of cassava

In order to provide a theoretical basis for optimizing the cassava cultivation methods, the present experiment was conducted to study the effects of continuous cropping on fungal community structure succession in non-rhizosphere and rhizosphere soil of cassava. Cassava was planted on the same plot for three consecutive years in same management method. The effects of different continuous cropping years on the structural succession of major dominant fungal communities in cassava non-rhizosphere and rhizosphere soils were analyzed by high-throughput sequencing technology and bioinformatics combined with soil agrochemical analysis method. Cassava continuous cropping affects soil physicochemical properties through root secretions, thereby altering the survival environment of fungi, which in turn causes changes in the diversity and abundance of fungal communities in cassava non-rhizosphere and rhizosphere soils; significant effects began to appear in the third year of continuous cropping, in which the Ascomycota in the non-rhizosphere evolved from Myrothecium, Sordariomycetes, and Dothideomycetes in the first year to a single Knufia. The relative abundance of beneficial fungi in the rhizosphere soil: Hypocreales, Myrothecium, and Sordariomycetes decreased with the increase in the number of years of continuous cropping, which may be one of the inducing factors of the continuous cropping disorder in cassava.