Soil Moisture

AUS-TMI-FOR-SMO General Moderate confidence

Benchmark Value

35 % VWC

Direction: Higher is desirable ↑

Form: Point

Scoring Curve

Scoring curve unavailable

The scoring engine could not generate a curve for this benchmark context. The primary form is Point, 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.

Evidence & Context

The identified optimal range is approximately 33% to 40% Volumetric Water Content (VWC). A reference value of 35% VWC is proposed.

Metric Definition:

Volumetric Water Content (VWC) representing soil moisture as a proportion of soil volume.

Benchmark Definition:

This benchmark represents the optimal soil moisture range for production forestry in the Tropical & Subtropical Maritime Islands biome of Australia, indicating a state of high environmental health with sufficient water availability for plant growth and soil biological activity.

Justification:

It is above the empirically determined physiological stress threshold of 33% VWC, ensuring plant function is not water-limited. It falls within the range associated with high soil biological activity, crucial for nutrient cycling in nutrient-poor soils. It provides a buffer against drought stress and prolonged saturation.

Sources (2)

Preview of Soil moisture thresholds explain a shift from light-limited to water-limited sap velocity in the Central Amazon during the 2015-16 El Niño drought

Soil moisture thresholds explain a shift from light-limited to water-limited sap velocity in the Central Amazon during the 2015-16 El Niño drought

View Source

Soil moisture thresholds explain a shift from light-limited to water-limited sap velocity in the Central Amazon during the 2015-16 El Niño drought | Journal Article | PNNL Journal

Soil moisture thresholds explain a shift from light-limited to water-limited sap velocity in the Central Amazon during the 2015-16 El Niño drought | Journal Article | PNNL

View Source

Supporting Sources (8)

Additional references from the underlying research that informed this benchmark.

BIODIVERSITY CONSERVATION ON THE TIWI ISLANDS, NORTHERN TERRITORY: Part 1. Environments and plants, accessed July 30, 2025,

Contextual Support Journal

Plantation Forestry and Economic Development in the Tiwi Islands

View Source

Research and development investment delivering for Tiwi community

Contextual Support Journal

Research and development investment delivering for Tiwi community

View Source

Soil Research - CSIRO PUBLISHING, accessed July 20, 2025,

Contextual Support Journal

Soil Research - CSIRO PUBLISHING, accessed July 30, 2025,

View Source

Preview of Threshold Responses to Soil Moisture Deficit by Trees and Soil in Tropical Rain Forests: Insights from Field Experiments | BioScience | Oxford Academic

Threshold Responses to Soil Moisture Deficit by Trees and Soil in Tropical Rain Forests: Insights from Field Experiments | BioScience | Oxford Academic

Contextual Support Journal

Threshold Responses to Soil Moisture Deficit by Trees and Soil in Tropical Rain Forests: Insights from Field Experiments | BioScience | Oxford Academic

View Source

Tiwi Islands Indigenous Protected Area | Plan of Management 2023-2033, accessed July 30, 2025, ).pdf

Contextual Support

Tiwi Islands Fire and Weed Management Plan 2021

View Source

Tiwi Plantation Corporation and Port Melville - Transparency Portal, accessed July 30, 2025,

Contextual Support Government

Forestry | Department of Agriculture and Fisheries

View Source

Tiwi Plantation Corporation and Port Melville - Transparency Portal, accessed July 31, 2025

Contextual Support Government

Tiwi Plantation Corporation and Port Melville - Transparency Portal

View Source

Tiwi Tropical fire ants - CSIRO

Contextual Support Government

Tiwi Tropical fire ants - CSIRO

View Source

Context

Region Australia
Biome Tropical & Subtropical Maritime Islands
Land Use Production Forestry
Assessment Conservation Target
Evidence Type HealthyOperationalRange

Lifecycle

Status Active
Version 1
Effective From 10 Jun 2026

Notes

Lower Critical Threshold: ~33% VWC (plant physiological stress onset). Upper Detrimental Threshold: ~40% VWC (prolonged waterlogging leading to anoxia). Derived from functional thresholds in analogous tropical forests and contextualized for the Tiwi Islands production forestry system.