Arbuscular mycorrhizal fungi hyphal density rather than diversity stimulates microbial necromass accumulation after long-term Robinia pseudoacacia plantations

Summary

This field study investigates the relationship between arbuscular mycorrhizal fungi characteristics and soil microbial necromass accumulation in long-established Robinia pseudoacacia plantations. The research suggests that AMF hyphal density, rather than species diversity alone, is the primary driver of necromass accumulation—a key mechanism for soil organic matter formation and carbon storage. The findings may inform understanding of how fungal-mediated soil processes develop under perennial tree-based systems and contribute to soil carbon sequestration.

UK applicability

Robinia pseudoacacia is not native to the United Kingdom and has limited agricultural use in UK farming systems, though findings on AMF hyphal function and necromass dynamics may be relevant to UK agroforestry and perennial systems using native or adapted tree species. The mechanistic insights into soil fungal-microbial interactions could inform soil health monitoring in UK regenerative and agroforestry schemes.

Key measures

Arbuscular mycorrhizal fungi hyphal density; AMF taxonomic diversity; microbial necromass concentration; soil microbial community composition; soil organic matter; nutrient cycling

Outcomes reported

The study examined how arbuscular mycorrhizal fungi (AMF) hyphal density and diversity influence microbial necromass accumulation in soils beneath long-term Robinia pseudoacacia (black locust) plantations. It measured AMF hyphal parameters and their relationship to soil microbial community composition and necromass stocks.

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