Influence of arbuscular mycorrhizal inoculation on maize straw degradation and soil microbial biomass carbon and nitrogen, and enzyme activity in di-chamber split-root device Compare different effect of arbuscular mycorrhizal colonization on maize straw degradation Effect of arbuscular mycorrhizal colonization on broad bean straw degradation in a split root experiment Impacts of arbuscular mycorrhizal fungi on soil aggregation dynamics of neutral purple soil