Soil pH — Benchmark Detail

Benchmark Value

7 pH (CaCl₂)

Direction: Higher is desirable ↑

Form: MaximumOnly

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 6 benchmarks together — the OptimalRange form drives the primary score, while 5 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MinimumOnly Guard MaximumOnly Guard Point Guard MinimumOnly Guard OptimalRange Guard

Evidence & Context

Based on the principles of nutrient availability, soil pH values exceeding pH(CaCl2) 7.0 are considered to be increasingly sub-optimal for maintaining the characteristic structure and composition of high-integrity Temperate Grassy Woodlands.

Metric Definition:

Soil pH measured by the pHCaCl2 method, indicating the acidity level above which nutrient availability declines and ecosystem function is sub-optimal.

Benchmark Definition:

This benchmark defines the upper sub-optimal soil pH boundary above which nutrient availability decreases and ecosystem stress increases in Temperate Grassy Woodlands.

Justification:

This threshold is based on nutrient availability principles and observed shifts in plant community composition at higher pH values.

Sources (1)

Preview of (PDF) Temperate Woodland Conservation and Management. - ResearchGate

(PDF) Temperate Woodland Conservation and Management. - ResearchGate GreyLiterature

Full article: Birds on farms: a review of factors influencing bird occurrence in the temperate woodlands of south-eastern Australia - Taylor & Francis Online, accessed May 17, 2025

View Source

Supporting Sources (10)

Additional references from the underlying research that informed this benchmark.

(PDF) Determining reference conditions for management and ..., accessed August 5, 2025,

Contextual Support Journal

Effects of Stock Grazing on Biodiversity Values in Temperate Native Grasslands and Grassy Woodlands in SE Australia: A Literature Review - ACT Government

View Source

(PDF) The pH of Australian soils: field results from a national survey - ResearchGate, accessed July 25, 2025,

Contextual Support Journal

Caritat, P. de, & Cooper, M. (2011). The pH of Australian soils: Field results from a national survey. Soil Research, 49, 172-182.

View Source

Agriculture Victoria. (2024). Soil acidity.

Contextual Support Government

Agriculture Victoria. (2025). Soil acidity. Farm Management.

View Source

Australia's forests – overview - DAFF

Contextual Support

Approved Conservation Advice for the White Box - Yellow Box - Blakely's Red Gum Grassy Woodland and Derived Native Grassland - DCCEEW, accessed August 11, 2025,

View Source

Growing with Acid Soils - ecobotanica, accessed August 11, 2025,

Contextual Support

Growing with Acid Soils - ecobotanica, accessed August 11, 2025,

View Source

Preview of Identifying ecological barriers to restoration in temperate grassy woodlands: soil changes associated with different degradation states - ResearchGate, accessed August 5, 2025,

Identifying ecological barriers to restoration in temperate grassy woodlands: soil changes associated with different degradation states - ResearchGate, accessed August 5, 2025,

Contextual Support GreyLiterature

(PDF) Identifying ecological barriers to restoration in temperate grassy woodlands: soil changes associated with different degradation states - ResearchGate, accessed August 4, 2025,

View Source