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Factor (and suggested score) Score assigned Soil erosion Tree important for erosion control (5)* — Tree not significant for erosion control (1) Nutrient recycling Soil subject to leaching without tree (5) — Soil tight, slow to leach (1) Water percolation Sloping uplands (5) — Level uplands (2) Swamp (1) Animal usage Tree provides unique food, rest, or nest site (5) — Many similar trees in area (1) Habitat diversity Tree is rare but natural species in the area (5) — Tree is common or non-indigenous species in area (1) Canopy and neighbors Tree necessary for closing forest canopy (5) — Tree standing alone (5) Neither of above (1) Total: — ↵* The scorer is free to assign values that are between 1 and 5 in compromise situations
Total score Reduction factor 27-30 1.0 24-26 .9 21-23 .8 18-20 .7 15-17 .6 12-14 .5 9-11 .4 6-8 .3 Factor (and suggested score) Score assigned Flood prevention Drainage system subject to flooding (5)* — Not subject to floods (e.g., sand dunes) or floods of no consequence (1) Siltatlon Reservoirs or lakes downstream (5) — No pools downstream (1) Animal visitors Tree used by migrating or transient animals (5) — No temporary animal usage likely (1) Total: — ↵* Compromise situations may be scored at values between 1 and 5
Total score Reduction factor 13-15 1.0 11-12 .9 9-10 .8 7-8 .7 5-6 .6 3-4 .5 Additional years to stand Reduction factor 30 or more 1.0 20-29 .8 10-19 .6 5-9 .4 Less than 5 .2
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