Soil Organic Carbon (SOC)

AUS-TSR-CON-SOC General Moderate confidence

Benchmark Value

2 %
Thresholds: Lower: —, Upper: 2
Direction: Higher is desirable ↑
Form: MinimumOnly

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 2 benchmarks together — the MinimumOnly form drives the primary score, while 1 guard(s) constrain the result.

Contributing Benchmarks

MinimumOnly Primary LowerThreshold Guard

Evidence & Context

The agricultural literature frequently cites a value of approximately 2% SOC as a critical threshold, below which key soil functions like structural stability and water retention begin to degrade rapidly.

Metric Definition:

Minimum Soil Organic Carbon concentration indicating functional impairment

Benchmark Definition:

A minimum Soil Organic Carbon concentration of 2% below which key soil functions degrade rapidly, based on agricultural literature.

Justification:

Widely cited agronomic threshold for functional impairment of soil.

Sources (1)

Preview of Addressing the rundown of nitrogen and soil organic carbon - GRDC, accessed July 25, 2025,
Addressing the rundown of nitrogen and soil organic carbon - GRDC, accessed July 25, 2025, Journal

CRITICAL SOIL ORGANIC CARBON RANGE FOR OPTIMAL CROP RESPONSE TO MINERAL FERTILISER NITROGEN ON A FERRALSOL | Experimental Agriculture - Cambridge University Press

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Supporting Sources (3)

Additional references from the underlying research that informed this benchmark.

Preview of Nutrient relationships of tree species in a New South Wales Subtropical rainforest
Nutrient relationships of tree species in a New South Wales Subtropical rainforest
Contextual Support Journal

Nutrient relationships of tree species in a New South Wales Subtropical rainforest

View Source
Preview of Soil carbon distribution and its temperature sensitivity in tropical forests with different forest types
Soil carbon distribution and its temperature sensitivity in tropical forests with different forest types
Contextual Support Journal

Soil carbon distribution and its temperature sensitivity in tropical forests with different forest types

View Source
Preview of Soil Organic Carbon Distribution, Enzyme Activities, and the ... - MDPI
Soil Organic Carbon Distribution, Enzyme Activities, and the ... - MDPI
Contextual Support Journal

Soil Organic Carbon Distribution, Enzyme Activities, and the ... - MDPI

View Source

Context

  • Region Australia
  • Biome Tropical & Subtropical Rainforests
  • Land Use Conservation / Protected Natural Areas
  • Assessment Pristine Reference
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 21 Mar 2026

Notes

This threshold is not directly applicable to conservation rainforests but indicates severe degradation.

Related Benchmarks

Other benchmarks in the AUS-TSR-CON-SOC family.

3.2 % High
Conservation / Protected Natural Areas · Conservation Target
Point Active v1
2.2 % Moderate
Conservation / Protected Natural Areas · Conservation Target
MinimumOnly Active v1
4.6 % Moderate
Conservation / Protected Natural Areas · Conservation Target
MinimumOnly Active v1
1.4 % Moderate
Conservation / Protected Natural Areas · Conservation Target
MinimumOnly Active v1