Impacts of mastication: Soil seed bank responses to a forest thinning treatment in three colorado (USA) Conifer forest types

Akasha M. Faist, Heather Stone, Erin A. Tripp

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Mastication is a forest fuel thinning treatment that involves chipping or shredding small trees and shrubs and depositing the material across the forest floor. By decreasing forest density mastication has been shown to lessen crown fire hazard, yet other impacts have only recently started to be studied. Our study evaluates how mastication treatments alter the density and composition of soil seed banks in three Colorado conifer forest types. The three forest types were (1) lodgepole pine, (2) ponderosa pine and (3) pinyon pine-juniper. Results showed that masticated sites contained higher seed bank densities than untreated sites: a pattern primarily driven by treatment effects in ponderosa pine forests. The seed bank was dominated by forbs regardless of forest type or treatment. This pattern of forb dominance was not observed in the aboveground vegetation cover as it demonstrated more even proportions of the functional groups. Graminoids showed a higher seed density in treated sites than untreated and, similarly, the identified non-native species only occurred in the treated ponderosa pine sites suggesting a potential belowground invasion for this forest type. These results suggest that presence of masticated material might not be creating a physical barrier hindering the transfer of seeds as predicted.

    Original languageEnglish
    Pages (from-to)3060-3074
    Number of pages15
    JournalForests
    Volume6
    Issue number9
    DOIs
    StatePublished - 2015

    Keywords

    • Conifer
    • Lodgepole
    • Pinyon-juniper
    • Ponderosa
    • Seed banks
    • Vegetation

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