Why soils are losing their diversity

I wanted to know if the term "exploitation" is scientifically sound, or if it's just an emotionally charged term in the sustainability discourse. So I looked at the data, and the data is clear: Soils are losing value worldwide.

• organic substance
• microbial diversity
• Structural stability
• Water storage capacity
• functional resilience

This is not an ideology. This is soil science. And if we want to understand why soils are losing their diversity, we must consider two key processes:

1. Functional simplification through monocultures
2. Loss of organic matter due to intensive farming

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1. Soil is a highly complex ecosystem.

Before speaking of "loss," it must be clear what is actually being lost. Healthy soil consists of:

• 45% mineral content
• 25% water
• 25% air
• 5% organic matter

This 5% of organic matter is key. Because it provides habitat and energy for:

• bacteria
• Mushrooms
• Actinomycetes
• Protozoa
• Nematodes
• Arthropods
• earthworms

A teaspoon of fertile soil contains billions of microorganisms. These organisms are not inhabitants.

They are functionaries.

She:

• mineralize nitrogen
• mobilize phosphorus
• stabilize soil aggregates
• produce polysaccharides
• form mycorrhizal networks
• store carbon

Soil is not a substrate.
Soil is a functional network. And this very network is being increasingly simplified.

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2. Monocultures – when biodiversity is systematically reduced

2.1 Plant diversity controls microbial diversity

A key study by Lange et al. (2015, Nature Communications , DOI: 10.1038/ncomms7704) examined 60 European grassland areas. Result: The higher the plant diversity, the higher the:

• microbial biomass
• Mycorrhizal density
• functional activity

Plants release so-called exudates through their roots:

• Sugar
• Amino acids
• organic acids
• secondary metabolites

These substances act selectively on microorganisms. Diversity above ground creates diversity below ground. This is a measurable correlation.

Long-term studies show: Venter et al. (2016, Soil Biology & Biochemistry , DOI: 10.1016/j.soilbio.2016.04.017):

• Reduced bacterial diversity in monocultures
• Lower enzymatic activity
• Dominance of a few functional groups

This means: The soil ecosystem is functionally simplified. And reduced functional diversity means:

• lower resilience
• higher susceptibility to illness
• greater dependence on external inputs

Monoculture is not just an agricultural economic model.
It is a systemic reduction of biological complexity. And complex systems lose their stability through simplification.

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3. Humus degradation – the central driver of functional loss

If I had to name just one indicator that describes the condition of soil, it would be: organic matter content.

3.1 Global development of soil carbon

Rattan Lal (2004, Science , DOI: 10.1126/science.1097396) describes:

• Intensive agriculture has released significant amounts of organic soil carbon worldwide.
• Soils have gone from being carbon sinks to carbon sources.

Organic substance is:

• Carbon storage
• water reservoir
• Nutrient buffers
• Structural stabilizer

If it is lost, the soil loses several functions simultaneously.

Six et al. (2002, Soil & Tillage Research , DOI: 10.1016/S0167-1987(02)00059-8):

Intensive soil cultivation:

• increases oxygen input
• accelerates microbial degradation
• destabilizes soil aggregates

The result:

• CO₂ release
• Structural decay
• increased susceptibility to erosion

Humus degradation is not a passive process.
It is actively accelerated through management.

Rawls et al. (2003, Geoderma , DOI: 10.1016/S0016-7061(03)00094-6):

An increase in organic matter of 1% significantly increases:

• Field capacity
• plant-available water

In times of increasing droughts, this is no small matter. Humus is a water reservoir. If we lose it, we lose resilience to climate stress.

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4. Why this is not a neutral development

Let me be clear here: The loss of soil diversity is not a natural cycle.
It is man-made. It is created by:

• Intensification
• simplification
• Decoupling of cycles
• Focus on short-term returns

And it is measurable. Soil stores more carbon than the atmosphere and vegetation combined. When humus is lost:

• CO₂ increases
• Water storage capacity decreases
• Erosion increases
• Biodiversity is declining

Soil is a climate factor.
Water regulator.
Livelihood. That's not a romantic perspective.
This is systems analysis.

5. Soil compaction – the underestimated physical factor

Besides biological depletion and humus loss, there is a third key factor: structural breakdown due to compaction. Soil is not just made up of material –
It consists of pore spaces.

• Macropores → Air circulation
• Mid-pores → Water conduit
• Fine pores → Water storage

When soil is compacted:

• The air content decreases
• Roots grow poorly
• Microorganisms lose their habitat
• Water cannot seep away as easily.

Studies show that compaction significantly reduces microbial activity because oxygen limitation restricts biological processes. Compacted soil is biologically and physically disrupted.

And what particularly concerns me: compaction is often irreversible or only very slowly regenerable.

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6. Nutrient buffering – why structure and minerals are crucial

In discussions about humus, it is often overlooked that the mineral matrix also plays a central role. A crucial term here is cation exchange capacity (CEC). It describes the soil's ability to bind positively charged nutrients.

• Potassium (K⁺)
• Magnesium (Mg²⁺)
• Calcium (Ca²⁺)
• Ammonium (NH₄⁺)

Soils with high CEC:

• store nutrients
• prevent leaching
• supply plants more evenly

Humus contributes to the CEC.
But also certain clay minerals and structurally stable silicate minerals. Here begins an often overlooked level of soil regeneration: Don't just think organically.
But organic + mineral. A stable system needs both.

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7. Silicon – a functional but underestimated building block

Silicon is the second most abundant element in the Earth's crust after oxygen. However, plant-available silicon is not a given. Scientific studies show:

• Silicon can stabilize plant cell walls.
• It increases mechanical strength
• It can improve stress resistance to drought.
• It promotes tolerance to biotic stress.

The plant-available silicon fraction decreases, especially in intensively farmed soils. Silicon is not a classic "fertilizer".
It is a structural and stabilizing factor. And this is precisely where the circle closes for me: structure determines stability –
in the soil as well as in the plant.

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8. The logical consequence: Regenerative gardening practices

Once I understand the mechanisms, practice does not arise from ideology – but from system logic.

8.1 Promoting diversity

Mixed culture
Crop rotation
flowering strips
Green manure

Diversity increases functional stability.

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8.2 Building up humus

compost
Mulch
Keep plant residues in the cycle
Incorpor cover crops

Humus increases:

• Water storage

• Nutrient buffering

• microbial activity

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8.3 Disturb the ground as little as possible

• no unnecessary digging

• no permanent exposure

• Protection against erosion

Disruption reduces stability.

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8.4 Targeted supplementation of mineral structure

A stable floor requires:

• organic substance

• microbial activity

• mineral structural components

Structurally stable silicate minerals can:

• Nutrients buffer
• storing water
• stabilize the soil matrix
  

Regeneration means integration of all levels.

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9. So: Now, an opinion on this.

I now consider the term "overexploitation" to be scientifically justified. Not because I want to be alarmist.
But because the data shows that in many places we are extracting resources faster than systems can regenerate.

But I also maintain that soil regeneration is possible. And it doesn't begin with global politics.
It starts in square meters. My garden is not an isolated room.
He is part of a larger system.

If I:

• Build up humus
• Promote diversity
• Stabilize structure
• mineral balance supported

Then I'm not just working on profit.
I'm working on system stability.

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Why understanding changes action

I wanted to know if the ground loss was real. It is.

I wanted to know if it could be explained scientifically. It can.

And I wanted to know if there was anything I could do. I can.

Regeneration is not a utopia.
It is applied soil science.

And it begins precisely where I take responsibility.

The ground beneath my feet.