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Simulating Regeneration Dynamics in Upland Oak Stands

USDA Forest ServiceSouthern Research StationDr. David Loftis

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USDA Forest ServiceSouthern Research StationDr. David Loftis

Regen for Excel is a simulation model that using rankings of expected postharvest performance to predict species composition of dominant and codominant trees twenty years following complete overstory removal

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USDA Forest ServiceSouthern Research StationDr. David Loftis

Scenario 1: Midstory Present, No Yellow-Poplar Seed Source

Density of Advance Seedling Reproduction by Species and Height Class (ft) prior to complete overstory removal

Species Small Medium Large Total

  (< 2 ft tall) (2 to 4 ft tall) (> 4ft tall)  

Red Maple 600 600 300 1500

Sugar Maple 300 300 0 600

White Oak 200 100 0 300

Red Oak 300 150 20 470

A. Beech 200 150 130 480

Total 1600 1300 450 3350

Scenario 1: Midstory Present, No Yellow-Poplar Seed Source

Species composition of dominant/codominant canopy trees twenty years following overwood removal

Scenario 2: Midstory Present, Yellow-Poplar Seed Source Present

Species composition of dominant/codominant canopy trees twenty years following overwood removal

Scenario 3: No Midstory Present, Yellow-Poplar Seed Source Present

Density of Advance Seedling Reproduction by Species and Height Class (ft) prior to complete overstory removal

Species Small Medium Large Total  (< 2 ft tall) (2 to 4 ft tall) (> 4ft tall)  

Red Maple 600 0 0 600Sugar Maple 300 0 0 300White Oak 200 100 0 300Red Oak 300 150 20 470A. Beech 200 0 0 200Total 1600 250 20 1870

Scenario 3: No Midstory Present, Yellow-Poplar Seed Source Present

Species composition of dominant/codominant canopy trees twenty years following overwood removal

Scenario 4: Shade tolerant understory and midstory trees removed, Yellow-Poplar Seed Source Present

Density of Advance Seedling Reproduction by Species and Height Class (ft) prior to complete overstory removal

Species Small Medium Large Total  (< 2 ft tall) (2 to 4 ft tall) (> 4ft tall)  

Red Maple 0 0 0 0Sugar Maple 0 0 0 0White Oak 200 100 0 300Red Oak 300 150 20 470A. Beech 0 0 0 0Total 500 250 20 770

Scenario 4: Shade tolerant understory and midstory trees removed, Yellow-Poplar Seed Source Present

Species composition of dominant/codominant canopy trees twenty years following overwood removal

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Simulating Regeneration Dynamics in Upland Oak Stands

USDA Forest ServiceSouthern Research StationDr. David Loftis

Simulations underscore:

• Importance of having competitive advance oak reproduction present prior to final overstory removal

• Role of silvicultural treatments in controlling competing vegetation and enhancing the competitive position of oak reproduction