Soil fungi: decomposition, mycelium and structure

Fungi transform residues, incorporate carbon into biomass and retain nutrients. Mycorrhizal fungi extend the area from which roots obtain nutrients through fine hyphae. These functions are important to a functioning soil food web.

Hyphae and mycelium

Many fungi grow as fine threads, or hyphae, through residues and soil spaces. Their network is the mycelium. Mushrooms are the fruiting bodies of some fungi; much fungal growth occurs beneath the surface.

Transforming resistant organic materials

In the Soil Biology Primer, Elaine Ingham describes decomposers using complex plant materials such as cellulose and lignin. Woody residues and leaves become fungal biomass and smaller compounds, while respiration releases some carbon. Other groups include root-associated mycorrhizal fungi and plant pathogens. Management aims for a community supporting the crop.

A network connecting aggregates

The Soil Food Web School explains how hyphae join microaggregates formed with bacterial substances into larger structures. Pores between them contain air, water and roots. Biology thereby helps shape soil structure and plant growing conditions.

Nutrition moves through the food web

Fungi incorporate nutrients into biomass. Organisms consuming fungal material release some of those nutrients in available forms. Decomposers and their consumers work together in nutrient cycling, directing our attention to the whole community and its interactions.

Connecting observation with activity

In 1984, Elaine Ingham and Donald Klein studied the relationship between fungal hyphal activity and fluorescein diacetate staining. They examined two fungi in soil systems under different nutrient additions, relating staining to fungal carbon dioxide production. This explored how a microscopic measure can connect with organisms’ carbon transformations.

Protecting food and habitat

Residues feed decomposers; cover protects against overheating and severe drying. Reduced tillage and compaction help preserve growing conditions. USDA–NRCS guidance associates low fungal populations with excessive tillage, few residues, monoculture and excessive agrochemical use.

Compost and microscopic monitoring

The School connects biologically active compost and liquid applications with microbiology assessment. We observe fungal hyphae alongside other groups and repeat observations after applications to compare the baseline with subsequent changes.

Our field work

We produce compost from different organic materials and examine its fungal community. Olive grove applications are planned around initial microbiology and repeated observations, following our School training.

Sources and further reading

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