Fire facilitates ground layer plant diversity in a Miombo ecosystem

Area of Science:

• Ecology
• Botany
• Conservation Biology

Background:

• Miombo ecosystems' ground layer plant responses to fire are poorly understood.
• Fire management is expanding for carbon initiatives, necessitating ecological impact assessments.

Purpose of the Study:

• To assess fire's impact on ground layer plant composition and richness in Miombo.
• To compare ground layer responses to tree responses and analyze functional group differences.

Main Methods:

• A 60-year fire experiment in Zambia.
• Quantified ground layer plant richness and diversity across late dry-season fire, early dry-season fire, and fire exclusion treatments.
• Conducted five repeat surveys throughout the wet and early dry seasons.

Main Results:

• Fire-maintained treatments supported higher species richness and diversity.
• The late dry-season fire treatment showed twice the average richness of fire exclusion.
• C4 grass and geoxyle richness peaked in the late-fire treatment; sedges were unique to it.

Conclusions:

• Fire seasonality and intensity heterogeneity promote unique flora diversity.
• Focusing solely on trees underestimates fire's biodiversity impact in Miombo.
• Integrating ground layer flora knowledge into policy is essential for conservation.