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Seeding versus natural regeneration: a comparison of vegetation change following thinning and burning in ponderosa pine

Springer, Judith D. and Waltz, Amy E.M. and Fule, Peter Z. and Moore, Margaret M. and Covington, W. Wallace (2001) Seeding versus natural regeneration: a comparison of vegetation change following thinning and burning in ponderosa pine. In: Ponderosa pine ecosystems restoration and conservation: steps toward stewardship (RMRS-P-22), April 25-27, 2000, Flagstaff, AZ.


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The decision whether to seed with native species following restoration treatments should be based on existing vegetation, species present in or absent from the soil seed bank, past management history, microclimate conditions and soils. We installed three permanent monitoring plots in two areas (total 18.6 ha) at Mt. Trumbull, AZ. Trees were thinned and the sites burned in 1996 and 1997. A 5 ha area was seeded with native shrub, grass and forb species; the remaining 13.6 ha were unseeded. Pretreatment species richness ranged from none to five species per plot. We recorded 13 graminoid and eight shrub species in the seeded area, and four graminoid and four shrub species in the unseeded area. The greatest increase in species richness in both seeded and unseeded plots occurred approximately 1.8 years posttreatment. Perennial native species dominated plant cover by 2.8 years, although annual native forbs dominate the soil seed bank. Perennial grasses are nearly absent from the seed bank. The seeded area had the highest diversity, but it also had twice as many nonnative species (14 versus 7 in the unseeded plots). By August 1999, maximum species richness reached 51 species on the seeded plot. Of these species, 80 percent were native. Although seeding increases diversity, it may also have the long-term tradeoff of introducing new genotypes and species, both native and nonnative.

Item Type: Conference or Workshop Item (Paper)
Publisher’s Statement: Published by US Forest Service.
Keywords: Ponderosa pines (Pinus ponderosa); Ecosystem management; Landscape management; Restoration; Conservation; Fire behavior; Cost effectiveness analysis; Seeding; Tree thinning; Prescribed burns; ERI Library
Subjects: S Agriculture > SD Forestry
Department/Unit: Research Centers > Ecological Restoration Institute
Date Deposited: 18 May 2017 20:00
URI: http://openknowledge.nau.edu/id/eprint/2836

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