Basal Area — Benchmark Detail

Benchmark Value

30 m²/ha

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 11 benchmarks together — the OptimalRange form drives the primary score, while 10 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

An upper detrimental threshold for agricultural crop production at a basal area of > 30 m²/ha where competition severely impacts understory/crop growth.

Metric Definition:

Basal area, defined as the cross-sectional area of tree stems at breast height per unit of land area.

Benchmark Definition:

This benchmark defines the upper detrimental threshold for basal area in agricultural crop production, above which competition severely limits understory crop growth and system viability.

Justification:

Based on direct field evidence from enrichment planting trials in North Queensland and supported by international agroforestry system data.

Sources (2)

Preview of The Long-Term Survival and Growth of Enrichment Plantings in ..., accessed July 17, 2025,

The Long-Term Survival and Growth of Enrichment Plantings in ..., accessed July 17, 2025, Journal

Reforestation in the Tropics and Subtropics of Australia

View Source

Typology of coffee-based agroforestry systems in the semi-deciduous forest zone of Togo (West Africa) Journal

Typology of coffee-based agroforestry systems in the semi-deciduous forest zone of Togo (West Africa)

View Source

Supporting Sources (5)

Additional references from the underlying research that informed this benchmark.

Managing competition between forestry plants. - Forest Learning, accessed July 17, 2025,

Contextual Support Journal

Managing competition between forestry plants. - Forest Learning

View Source

Scattered paddock trees - Local Land Services - NSW Government

Contextual Support GreyLiterature

Ecosystem Services from agroforestry systems in Australia - Southern Cross University

View Source

The Bioeconomic Potential for Agroforestry in Australia's Northern Grazing Systems, accessed July 17, 2025,

Contextual Support Journal

The Bioeconomic Potential for Agroforestry in Australia's Northern Grazing Systems

View Source

Tree-grass balance | Meat & Livestock Australia - MLA, accessed July 17, 2025,

Contextual Support Journal

Tree-grass balance | Meat & Livestock Australia - MLA, accessed July 17, 2025,

View Source

Typology of coffee-based agroforestry systems in the semi-deciduous forest zone of Togo (West Africa) - SciSpace, accessed July 17, 2025,

Direct Evidence Journal

Typology of coffee-based agroforestry systems in the semi-deciduous forest zone of Togo (West Africa) - SciSpace, accessed July 17, 2025,

View Source

Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Agricultural Crop Production
Assessment Conservation Target
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 8 Jun 2026

Notes

Above this level, competition from the tree canopy severely suppresses the growth and yield of the understory crop component, making the integrated system non-viable.

Related Benchmarks

Other benchmarks in the AUS-TSR-AGR-BAS family.