- Arbuscular mycorrhizal fungi (AMF) are essential for the transfer of plant-based carbon to soil organic matter.

- Organic matter derived from AMF is highly stable and can persist in soil for centuries to millennia.

- The stabilization of AMF-derived organic matter is due to its close association with soil minerals, which protect it from decomposition.

Summary

The accumulation of organic matter in soil is a critical component of the global carbon cycle. Soil organic matter is derived from a variety of sources, including plant litter, root exudates, and microbial residues. However, the processes by which organic matter is stabilized in soil are not fully understood.

Arbuscular mycorrhizal fungi (AMF) are a type of root-associated fungus that forms a symbiotic relationship with most plants. AMF hyphae extend into the soil, increasing the plant's ability to absorb water and nutrients. In return, the plant provides the AMF with carbohydrates.

Recent studies have shown that AMF play an important role in the transfer of plant-based carbon to soil organic matter. AMF hyphae are colonized by bacteria and other microorganisms, which break down the plant-derived carbohydrates into smaller molecules. These smaller molecules are then taken up by the AMF hyphae and transported to the soil where they are deposited.

The organic matter derived from AMF is highly stable and can persist in soil for centuries to millennia. This is due to its close association with soil minerals, which protect it from decomposition.

The accumulation of AMF-derived organic matter in soil has a number of important implications. First, it contributes to the long-term storage of carbon in soil, which helps to mitigate climate change. Second, it improves soil structure and fertility, which can benefit plant growth. Third, it provides a habitat for a variety of soil organisms, which are essential for the functioning of healthy ecosystems.

Implications for soil management

The findings of this study have implications for soil management practices. By promoting the growth of AMF, farmers can increase the amount of organic matter in their soils. This can improve soil structure and fertility, and help to mitigate climate change.

There are a number of ways to promote the growth of AMF. These include:

- Reducing the use of chemical fertilizers and pesticides, which can kill AMF.

- Adding organic matter to the soil, which provides a food source for AMF.

- Using cover crops, which help to maintain soil moisture and provide a habitat for AMF.

- Avoiding soil disturbance, which can damage AMF hyphae.

By following these practices, farmers can improve the health of their soils and help to mitigate climate change.