Growing stock level (GSL) is a numerical target for the residual basal area or tree density left after a thinning operation, usually standardized to a specific reference diameter. Foresters use GSL curves to determine exactly how many trees to remove to maximize the growth rate and timber quality of the remaining stand.
Heard on the job
The prescription calls for thinning this ponderosa pine stand to a GSL of 80.
Related terms
Stocking
The ratio of actual tree density in an area compared to the ideal density for optimal growth.
Mensuration
The mathematical science of measuring forest stands to determine volume, growth, and health.
Cruise
To survey a forest stand to estimate the volume, species composition, and quality of timber.