Why are fungi important in soils?

• A. Long-term carbon storage, aggregation, and nutrient transfer
• B. They primarily reduce soil porosity
• C. They increase erosion
• D. They cause rapid nutrient loss

Answer: (A)

Fungi shape soils by building structure, storing carbon, and moving nutrients between soil and plants. Their threadlike hyphae weave through soil, binding particles into stable aggregates that improve soil structure, increase porosity in places, enhance water infiltration, and reduce erosion. They also produce glomalin, a sticky glycoprotein that cements these aggregates together and helps lock carbon in the soil for long periods, contributing to long-term carbon storage. In many soils, mycorrhizal fungi form partnerships with plant roots, extending the effective root surface area and boosting the uptake of nutrients like phosphorus and nitrogen; they can also transfer nutrients from organic matter to plants. Additionally, fungal enzymes break down complex organic compounds, releasing nutrients more slowly and sustainably. All of this together explains why fungi are so important: they support long-term carbon storage, create and stabilize soil aggregates, and enable efficient nutrient transfer between soil and plants.