Soil Moisture — Benchmark Detail

Benchmark Value

No specific value — see range

Range: 12 to 20 %

Thresholds: Lower: 12, Upper: —

Optimal Range: 12 to 20

Direction: Higher is desirable ↑

Form: OptimalRange

Scoring Curve

Scoring curve unavailable

The scoring engine could not generate a curve for this benchmark context. The primary form is CompositeFramework, but the benchmark data may be missing required fields (e.g., optimal range bounds for an OptimalRange benchmark). This is typically a data quality issue in the benchmark pipeline.

Contributing Benchmarks

CompositeFramework Primary MinimumOnly Guard LowerThreshold Guard OptimalRange Guard CompositeFramework Guard OptimalRange Guard

Evidence & Context

Numerically, drawing from the global ranges of θcrit 13, this threshold could vary from approximately 12% VWC (for coarser textured soils in the drier parts of the biome) to 20% VWC (for finer textured soils in more mesic areas within the biome), below which significant plant water stress and impairment of ecosystem functions occur.

Metric Definition:

Lower critical threshold for soil moisture where significant plant water stress begins and primary productivity markedly declines.

Benchmark Definition:

The lower critical threshold is the soil moisture content below which ecosystem function is impaired due to water stress in temperate dry woodlands and native grasslands under livestock grazing.

Justification:

This threshold is based on global ranges of critical soil moisture thresholds (θcrit) and varies with soil texture and local conditions.

Sources (1)

Global critical soil moisture thresholds of plant water stress - ResearchGate, accessed August 28, 2025 Journal

Global critical soil moisture thresholds of plant water stress - ResearchGate

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Supporting Sources (2)

Additional references from the underlying research that informed this benchmark.

Pasture yield and soil physical property responses to soil compaction from treading and grazing — a review - ANU Open Research

Contextual Support GreyLiterature

Pasture yield and soil physical property responses to soil compaction from treading and grazing — a review - ANU Open Research

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Soil | Australia state of the environment 2021

Contextual Support GreyLiterature

Soil | Australia state of the environment 2021

View Source

Context

Region Australia
Biome Temperate Dry Woodlands & Native Grasslands
Land Use Livestock Grazing & Pasture
Assessment Pristine Reference
Evidence Type DegradationThreshold

Lifecycle

Status Superseded
Version 1
Effective From 22 Mar 2026
Effective To 22 Mar 2026

Notes

Lower Critical Threshold: 12 % VWC. No upper detrimental threshold — higher values are always better up to natural saturation. The threshold varies from 12% to 20% VWC depending on soil texture and biome location; it represents the onset of significant plant water stress and ecosystem function decline.

Related Benchmarks

Other benchmarks in the AUS-TDG-LVG-SMO family.