Shelterwood Overstory Retention Percent
Summarize matched original/retained overstory basal-area inventories and represented area; not single-tree basal area, canopy cover or a regeneration guarantee.
Description
Shelterwood retention can be summarized as the fraction of original overstory basal area remaining.
Shelterwood retention can be summarized as the fraction of original overstory basal area remaining. Represented plot area separately converts retained inventory to m²/ha.1
Summarize matched original/retained overstory basal-area inventories and represented area; not single-tree basal area, canopy cover or a regeneration guarantee.
When to use Shelterwood Overstory Retention Percent
Use this tool to summarize matched original/retained overstory basal-area inventories and represented area; not single-tree basal area, canopy cover or a regeneration guarantee.
Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
How to use Shelterwood Overstory Retention Percent and understand its results
- Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
- Enter preHarvestOverstoryBasalAreaM2, retainedOverstoryBasalAreaM2, representedPlotAreasHa using the field table and calculation rules, then run the tool.
- Read retainedBasalAreaPercent, removedBasalAreaPercent, retainedBasalAreaM2PerHa. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| preHarvestOverstoryBasalAreaM2 | Pre harvest overstory basal area m2 | list of number | Required |
| retainedOverstoryBasalAreaM2 | Retained overstory basal area m2 | list of number | Required |
| representedPlotAreasHa | Represented plot areas ha | list of number | Required |
Pair nonnegative original and retained basal-area inventories with positive plot hectares. Require retained≤original in every pair and positive original total. Return retained/removed percentages and retained basal area per hectare.
Paired lists must be nonempty and have equal lengths.
retained %=100 × total retained/total original; retained density=total retained/represented ha Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| retainedBasalAreaPercent | Retained basal area percent | number |
| removedBasalAreaPercent | Removed basal area percent | number |
| retainedBasalAreaM2PerHa | Retained basal area m2 per ha | number |
{
"input": {
"preHarvestOverstoryBasalAreaM2": [
10,
20
],
"retainedOverstoryBasalAreaM2": [
8,
10
],
"representedPlotAreasHa": [
1,
2
]
},
"output": {
"retainedBasalAreaPercent": 60,
"removedBasalAreaPercent": 40,
"retainedBasalAreaM2PerHa": 6
}
}Limitations and assumptions
Basal area differs from canopy cover. No regeneration outcome is guaranteed.
Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Species Importance Value: Calculate the three-component 0–300 importance-value convention from measured stems, basal area and plot occurrences; not percentage dominance alone or ecological importance certification. For a complementary task, use Residual Stand Damage Percent Basal Area: Compare caller observed damaged residual basal area with assessable residual inventory and bounds for unassessable area; no diagnosis from raw stem count or assumed health of unexamined trees.
References
-
Shelterwood Overstory Retention Percent — tool.io
Similar or alternative tools
- Species Importance Value
Calculate the three-component 0–300 importance-value convention from measured stems, basal area and plot occurrences; not percentage dominance alone or ecological importance certification.
- Residual Stand Damage Percent Basal Area
Compare caller observed damaged residual basal area with assessable residual inventory and bounds for unassessable area; no diagnosis from raw stem count or assumed health of unexamined trees.