The two major groups of mycorrhizal fungi are the ectotrophic and endotrophic types. 主要的菌根真菌有两种：内生型和外生型。
It was confirmed experimentally that under anaerobic condition the microorganisms trend to survive on the energy sustained by endotrophic degradation of the carbon-hydrates (CH). 通过试验证实了在厌氧条件下，微生物倾向于利用降解体内的糖类物质(CH)提供能量维持生活。
