Soil Moisture

AUS-TMS-LVG-SMO General Moderate confidence

Benchmark Value

No specific value — see range
Range: 15 to 27 %
Optimal Range: 15 to 27
Direction: Higher is desirable ↑
Form: OptimalRange

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 OptimalRange form drives the primary score, while 1 guard(s) constrain the result.

Evidence & Context

The proposed reference for topsoil moisture under best-practice management, supporting optimal ecological function and plant resilience, is an observed wet season volumetric water content (VWC) range of 15% to 27%.

Metric Definition:

Volumetric water content (VWC) in the topsoil during the wet season

Benchmark Definition:

Volumetric water content (VWC) in the topsoil during the wet season indicative of best-practice management in tropical monsoonal savannas under livestock grazing and pasture.

Justification:

Derived from field measurements in comparable savanna ecosystems reflecting conditions conducive to active plant growth and ecosystem processes, supported by TERN CosmOz data and regenerative grazing principles.

Sources (1)

Preview of Trends and variability of water balance components over a tropical savanna and Eucalyptus forest in Australia
Trends and variability of water balance components over a tropical savanna and Eucalyptus forest in Australia Journal

Trends and variability of water balance components over a tropical savanna and Eucalyptus forest in Australia

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Supporting Sources (3)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Global critical soil moisture thresholds of plant water stress
(PDF) Global critical soil moisture thresholds of plant water stress
Methodology Source Government

(PDF) Global critical soil moisture thresholds of plant water stress

View Source
Preview of (PDF) Review of soil water models with respect to savanna ...
(PDF) Review of soil water models with respect to savanna ...
Contextual Support Journal

Seasonal Patterns in Soil Moisture, Vapour Pressure Deficit, Tree Canopy Cover and Pre-dawn Water Potential in a Northern Australian Savanna.

View Source
Preview of Soil, plant and livestock interactions in Australian tropical ... - Brill
Soil, plant and livestock interactions in Australian tropical ... - Brill
Contextual Support Journal

Soil, plant and livestock interactions in Australian tropical ... - Brill

View Source

Context

  • Region Australia
  • Biome Tropical Monsoonal Savannas
  • Land Use Livestock Grazing & Pasture
  • Assessment Conservation Target
  • Season wet season
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 24 Mar 2026

Notes

Range allows for natural fluctuations while ensuring moisture is not limiting for key pasture species during their primary growth phase. No clear upper detrimental threshold for natural conditions, but grazing on saturated soils causes damage.