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

Bark thickness

A finite measured or assumed value greater than or equal to 0, expressed in mm.

Diameter at breast height

A finite measured or assumed value, expressed in cm.

The implementation follows this calculation rule: Express bark thickness as a percentage of trunk diameter at breast height from millimetres and centimetres.

Bark thickness

The calculated bark thickness in %.

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.

• CMS Percent

  Compute cell membrane stability as a percentage by comparing the control conductivity ratio to the treated conductivity ratio, control divided by treated times one hundred, clamped to the range zero through one hundred.

• MSI Percent

  Compute membrane stability as one minus the ratio of initial to boiled conductivity times 100, requiring a positive boiled conductivity and an initial conductivity that does not exceed it.

• Bark Density

  Compute bark density in grams per cubic centimetre as oven-dry bark mass divided by bark volume.