Soil Moisture

AUS-ASC-FOR-SMO General Moderate confidence

Benchmark Value

14 %

Thresholds: Lower: 14, Upper: —

Direction: Higher is desirable ↑

Form: LowerThreshold

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.

Contributing Benchmarks

OptimalRange Primary LowerThreshold Guard

Evidence & Context

For Alpine Humus Soils, more broadly indicative for understorey and general ecosystem health, a wilting point around 14% VWC represents a critical lower limit.

Metric Definition:

Volumetric Water Content (VWC) in Alpine Humus Soils

Benchmark Definition:

This benchmark represents the critical lower limit of soil moisture (volumetric water content) in Alpine Humus Soils, indicating the wilting point below which plant water availability is severely compromised in forest ecosystems.

Justification:

Wilting point for understorey grasses (Poa spp.) is ~14% VWC, representing a critical limit for plant water availability.

Sources (1)

Mortality of Australian alpine grasses (Poa spp.) after drought: species differences and ecological patterns - Oxford Academic Journal

Mortality of Australian alpine grasses (Poa spp.) after drought: species differences and ecological patterns - Oxford Academic

View Source

Supporting Sources (12)

Additional references from the underlying research that informed this benchmark.

Preview of Canopy structure modulates the sensitivity of subalpine forest stands to interannual snowpack and precipitation variability - HESS - Recent, accessed on May 28, 2025

Canopy structure modulates the sensitivity of subalpine forest stands to interannual snowpack and precipitation variability - HESS - Recent, accessed on May 28, 2025

Contextual Support Journal

Canopy structure modulates the sensitivity of subalpine ... - HESS

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Global variations in critical drought thresholds that impact vegetation - Oxford Academic

Contextual Support Journal

Global variations in critical drought thresholds that impact vegetation - Oxford Academic

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Improved forest management - CSIRO, accessed July 12, 2025,

Contextual Support Government

Ecosystem wicks: Woodland trees enhance water infiltration in a fragmented agricultural landscape in eastern Australia, accessed May 15, 2025,

View Source

Keeping tabs on native woodlands in times of flood and drought - ScienceDaily, accessed May 15, 2025,

Contextual Support GreyLiterature

Keeping tabs on native woodlands in times of flood and drought | ScienceDaily

View Source

Preview of Managing harvesting residues: a systematic review of management treatments around the world | Forestry: An International Journal of Forest Research | Oxford Academic

Managing harvesting residues: a systematic review of management treatments around the world | Forestry: An International Journal of Forest Research | Oxford Academic

Contextual Support Journal

Managing harvesting residues: a systematic review of management treatments around the world | Forestry: An International Journal of Forest Research | Oxford Academic

View Source

Mapping near-real-time soil moisture dynamics over Tasmania with transfer learning

Contextual Support Journal

Soil Research - CSIRO PUBLISHING

View Source

Monitoring and forecasting drought through the assimilation of satellite water observations Siyuan Tian - ANU Open Research

Contextual Support Government

Soil and Landscape Grid of Australia - esoil.io

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Soil moisture at Boorowa Agricultural Research Station - CSIRO

Contextual Support Government

10 Plant Water Relations and Irrigation - CABI Digital Library, accessed May 11, 2025,

View Source

TERN 2023 SCIENCE SYMPOSIUM - Terrestrial Ecosystem Research Network

Contextual Support Journal

Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io

View Source

TERN. TERN – Australia's Ecosystem Observatory Network, highlights for 2018-2023.

Contextual Support Government

TERN - Australia's Ecosystem Observatory Network

View Source

Tumbarumba Flux Data Collection - TERN Data Discovery Portal, accessed August 9, 2025

Contextual Support Government

Tumbarumba Flux Data Collection - TERN Data Discovery Portal

View Source

Tumbarumba OzFlux tower site - Research Data Australia

Contextual Support

Tumbarumba OzFlux tower site - Research Data Australia

View Source

Context

Region Australia
Biome Alpine and Subalpine Complex
Land Use Production Forestry
Assessment Pristine Reference
Vegetation Forest
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 22 Mar 2026

Notes

No upper detrimental threshold — higher values are always better up to natural saturation. Sustained periods below this level would severely compromise plant survival and broader ecosystem functions.

Related Benchmarks

Other benchmarks in the AUS-ASC-FOR-SMO family.