Contribution of Soil Mega-fauna to Plant Growth and Function:
Soil mega-fauna are large invertebrate animals (>0.2 mm) that reside in the soil ecosystem. They play a crucial role in various soil processes, including nutrient cycling, soil structure, and water infiltration, which ultimately benefit plant growth and function.
1. Nutrient Cycling:
- Mega-fauna break down organic matter and release nutrients, such as nitrogen and phosphorus, into the soil.
- Earthworms, for example, ingest soil and organic residues, mixing and distributing nutrients throughout the soil profile.
- This nutrient release supports plant growth and productivity.
2. Soil Structure:
- Mega-fauna create burrows and tunnels that improve soil aeration and drainage.
- The channels created by earthworms and termites allow water and oxygen to penetrate deeper into the soil.
- Improved soil structure enhances root development and nutrient uptake by plants.
3. Water Infiltration:
- The burrows and channels created by mega-fauna facilitate water infiltration and storage in the soil.
- Soil with high mega-fauna activity has higher water retention capacity, preventing runoff and erosion.
- Increased water availability supports plant growth during drought periods.
4. Seed Dispersal:
- Some mega-fauna species, such as ants and beetles, collect and disperse seeds.
- They bury seeds in the soil, protecting them from predators and providing them with a favorable environment for germination.
5. Plant Protection:
- Certain mega-fauna, such as predatory mites and nematodes, prey on pests and pathogens that can damage plants.
- Their presence helps control pests and diseases, reducing the need for chemical interventions.
6. Pollination:
- Bees, wasps, and ants are important pollinators that depend on the soil ecosystem for nesting and foraging.
- The presence of suitable nesting sites and food sources in the soil supports pollinator populations, which are essential for plant reproduction.
Conclusion:
Soil mega-fauna are key players in the soil ecosystem that contribute significantly to plant growth and function. Their activities improve soil nutrient availability, structure, and water relations, all of which support healthy plant development. Additionally, they facilitate seed dispersal, offer plant protection, and support pollination. Recognizing the importance of soil mega-fauna is crucial for maintaining soil health and ecosystem sustainability.