Soil biodiversity plays a crucial role in the health of the planet, food production and climate-change mitigation. Contrary to common perception, soil hosts the majority of living species on Earth, with fungi and plants making up the largest share.
Despite its fundamental importance, soil biodiversity is severely threatened by human activities-particularly intensive agriculture, which relies heavily on chemical fertilizers and pesticides. In response to this challenge, sustainable farming practices and organic amendments such as vermicompost and biochar are emerging as promising solutions to improve soil quality, boost crop productivity and support carbon sequestration.
Soil as a biodiversity hotspot
Soil is the most species-rich habitat on Earth, far surpassing other ecosystems often considered “hotspots“, such as coral reefs or rainforests. In fact, it is estimated that two-third of all known species live in soil – a figure significantly higher than previous assessments.
This biodiversity encompasses an enormous variety of life forms, ranging from genes – the hereditary units underlying an organism’s traits – to individual plant and animale species, all the way up to broader and more complex systems such as ecological communities, where numerous species interact with one another and with their surrounding environment in intricate ways.
The vital role of soil biodiversity
Soil biodiversity is essential for a wide range of vital ecosystem services.
- Food production: it supports the growth of healthy, nutritious crops, providing 95% of the food we consume
- Nutrient cycling: microorganisms transform organic and inorganic matter into forms that plants can absorb
- Water purification: healthy soils help filter and purify water
- Greenhouse gas and climate regulations: soil acts as a major carbon sink, thanks to the sequestration carried out by by microorganisms
- Human health protection: certain soil bacteria and fungi are used in food production and plants grown in healthy soils can produce beneficial compounds that support our immune system
- Pest and disease control: microbial diversity can help suppress plant pathogens
Threats to soil biodiversity
However, due to human activities, soil biodiversity is declining. Several factors help explain this decrease.
One major cause is excessive land consumption and urbanization: covering the ground with concrete and asphalt prevents soil organisms from surviving and disrupts natural balances.
Another significant factor is intensive agriculture, particularly the overuse of chemical fertilizers and pesticides, which alter the soil’s chemical composition. These changes can be lethal to many microorganisms that hel maintain soil biodiversity.
ISPRA, the Italian Institute for Environmental Protection and Research, has examined the issue by comparing global data and highlighting how human actions are the main driver of biodiversity loss and how they also contribute to ongoing climate change.
Vermicompost as a sustainable solution
One possible response to the loss of biodiversity and the resulting depletion of soil is vermicompost, an organic fertilizer produced through the breakdown of organic waste by earthworms and microorganisms.
But why is vermicompost such a valuable resource for improving soil fertility and crop yields?
A recent study published in Scientia Horticulturae in October 2024 reported that vermicompost:
- improves soil structure
- enhances microbial activity
- increases water retention
- boosts the availability of essential nutrients
Unlike inorganic fertilizers, vermicompost provides nutrients (such as nitrogen, phosphorus, potassium and micronutrients) in a more bioavailable form – that is, in a form more easily absorbed by plants. For this reason, it contributes more effectively to building soil that is resilient, productive and sustainable.
The role of biochar
Biochar is a form of charcoal produced through pyrolysis, a thermal decomposition process of biomass that occurs in the absence of oxygen. This process prevents combustion and results in a material that is rich in stable, porous carbon.
Its use in agriculture and environmental management offers numerous benefits. First, it improves soil fertility by increasing the availability of nutrients for plants. Its porous structure also enhances water retention, helping to maintain soil moisture while improving aeration and the physical structure of the soil. Additionally, it supports root growth.
From an environmental perspective, biochar plays an important role in mitigating climate change, as it sequesters carbon that can remain stable in the soil for hundreds or even thousands of years. It also creates a favorable environment for beneficial microorganisms, which are essential for soil balance. Another advantage is its ability to absorb heavy metals and other pollutants, making it useful for the remediation of contaminated soils.
Our commitment to preserve soil biodiversity
Through the Circular4Umus project, we have decided to put our commitment to preserving soil biodiversity into action.
The project specifically addresses the challenge of soil erosion and quality loss by engaging the entire community to enhance resilience and naturally regenerate the land. Both vermicomposting and biochar hel restore soil naturally and increase agricultural productivity, thereby contributing to environmental protection and the quality of local water resources
Soil biodiversity is an invaluable resource, essential for food production, climate regulation, water purification and human health. As we have seen, soil is a true “hotspot” of life, hosting the vast majority of the living species on our planet. However, intensive agriculture and excessive land consumption pose real threats to this delicate balance, compromising the fertility and resilience of our ecosystems.
It is in this context that innovative and sustainable solutions such as vermicomposting and the use of biochar emerge. Vermicompost, produced through the activity of earthworms, enriches the soil with bioavailable nutrients, improving its structure and microbial activity. Biochar, a stable and porous form of charcoal, not only enhances soil fertility and water retention but also plays a crucial role in carbon sequestration, actively contributing to climate change mitigation.
Projects like Circular4Umus demonstrate how concrete commitment to these practices can lead to natural soil regeneration and increased agricultural productivity, benefiting environmental protection and the quality of local water resources. Preserving soil biodiversity is not just an ecological concern – it is an essential investment for food security and the health of our planet. Adopting and promoting these solutions means building a future where our soils are alive, fertile and resilient, capable of supporting both present and future generations.
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