Soil Phosphorus
Benchmark Value
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 16 benchmarks together — the OptimalRange form drives the primary score, while 15 guard(s) constrain the result.
Contributing Benchmarks
Evidence & Context
A value of <2 mg/kg of available P (Colwell-P) can be considered a functional lower critical threshold, signaling a potential need for management intervention or a re-evaluation of the site's suitability for production forestry.
Available soil phosphorus measured by the Colwell-P method indicating the minimum functional level to avoid productivity constraints in production forestry.
This benchmark defines the minimum available soil phosphorus level below which productivity in tropical and subtropical rainforest production forestry is likely compromised.
Based on data from analogue systems and native forest control sites indicating productivity constraints below this level.
Sources (1)
Too much of a good thing: phosphorus over-fertilisation in rehabilitated landscapes of high biodiversity value
View SourceSupporting Sources (2)
Additional references from the underlying research that informed this benchmark.
Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC
View SourceSoil phosphorus transformations along a 500,000-year coastal dune chronosequence under subtropical rainforest in Australia
View Source