Use this plant measurement when samples, dry- or fresh-mass basis, image threshold, geometry, instrument calibration, and treatment timing follow one consistent protocol.

Bark dry mass

A finite measured or assumed value, expressed in g.

Bark volume

A finite measured or assumed value, expressed in cm³.

The implementation follows this calculation rule: Compute bark density in grams per cubic centimetre as oven-dry bark mass divided by bark volume.^[1]

Bark density

The calculated bark density in g/cm³.

Pigment proxies, canopy metrics, tissue density, and leakage indices are method-dependent. Species, developmental stage, hydration, illumination, extraction efficiency, sensor angle, and environmental conditions can confound comparisons. Ratios and percentages become unstable when their denominator is small, uncertain, or defined differently between samples.

Pair the proxy with calibrated chemical analysis, destructive biomass sampling, or repeated field measurements where practical. Report environmental conditions and whether values use fresh mass, dry mass, area, or volume.

• Canopy Bulk Density

  Compute canopy bulk density in kilograms per cubic metre as the canopy fuel mass divided by the canopy volume.

• Crop Growth Rate

  Compute crop growth rate in grams per square metre of ground per day as standing dry mass gain divided by ground area times elapsed days.

• Anthocyanin Content

  Compute anthocyanin content in micrograms per gram of dry mass as the corrected absorbance divided by the dry mass times an extinction scale factor that defaults to one hundred; apply any baseline correction to the absorbance upstream before passing it in.