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Article

Understory Vegetation Change Following Woodland Reduction Varies by Plant Community Type and Seeding Status: A Region-Wide Assessment of Ecological Benefits and Risks

1
U.S. Department of Agriculture, Agricultural Research Service, Forage and Range Research Laboratory, Utah State University, Logan, UT 84322-6300, USA
2
Great Basin Research Center, Utah Division of Wildlife Resources, Ephraim, UT 84627, USA
*
Author to whom correspondence should be addressed.
Plants 2020, 9(9), 1113; https://doi.org/10.3390/plants9091113
Received: 7 August 2020 / Revised: 19 August 2020 / Accepted: 27 August 2020 / Published: 28 August 2020
(This article belongs to the Section Plant Ecology)
Woodland encroachment is a global issue linked to diminished ecosystem services, prompting the need for restoration efforts. However, restoration outcomes can be highly variable, making it difficult to interpret the ecological benefits and risks associated with woodland-reduction treatments within semiarid ecosystems. We addressed this uncertainty by assessing the magnitude and direction of vegetation change over a 15-year period at 129 sagebrush (Artemisia spp.) sites following pinyon (Pinus spp.) and juniper (Juniperus spp.) (P–J) reduction. Pretreatment vegetation indicated strong negative relationships between P–J cover and the abundance of understory plants (i.e., perennial grass and sagebrush cover) in most situations and all three components differed significantly among planned treatment types. Thus, to avoid confounding pretreatment vegetation and treatment type, we quantified overall treatment effects and tested whether distinct response patterns would be present among three dominant plant community types that vary in edaphic properties and occur within distinct temperature/precipitation regimes using meta-analysis (effect size = lnRR = ln[posttreatment cover/pretreatment cover]). We also quantified how restoration seedings contributed to overall changes in key understory vegetation components. Meta-analyses indicated that while P–J reduction caused significant positive overall effects on all shrub and herbaceous components (including invasive cheatgrass [Bromus tectorum] and exotic annual forbs), responses were contingent on treatment- and plant community-type combinations. Restoration seedings also had strong positive effects on understory vegetation by augmenting changes in perennial grass and perennial forb components, which similarly varied by plant community type. Collectively, our results identified specific situations where broad-scale efforts to reverse woodland encroachment substantially met short-term management goals of restoring valuable ecosystem services and where P–J reduction disposed certain plant community types to ecological risks, such as increasing the probability of native species displacement and stimulating an annual grass-fire cycle. Resource managers should carefully weigh these benefits and risks and incorporate additional, appropriate treatments and/or conservation measures for the unique preconditions of a given plant community in order to minimize exotic species responses and/or enhance desirable outcomes. View Full-Text
Keywords: conifer encroachment; large-scale restoration; seeding; ecological site potential; woodland expansion; effect-size analysis; regional assessment; vegetation analysis; functional group conifer encroachment; large-scale restoration; seeding; ecological site potential; woodland expansion; effect-size analysis; regional assessment; vegetation analysis; functional group
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MDPI and ACS Style

Monaco, T.A.; Gunnell, K.L. Understory Vegetation Change Following Woodland Reduction Varies by Plant Community Type and Seeding Status: A Region-Wide Assessment of Ecological Benefits and Risks. Plants 2020, 9, 1113. https://doi.org/10.3390/plants9091113

AMA Style

Monaco TA, Gunnell KL. Understory Vegetation Change Following Woodland Reduction Varies by Plant Community Type and Seeding Status: A Region-Wide Assessment of Ecological Benefits and Risks. Plants. 2020; 9(9):1113. https://doi.org/10.3390/plants9091113

Chicago/Turabian Style

Monaco, Thomas A., and Kevin L. Gunnell 2020. "Understory Vegetation Change Following Woodland Reduction Varies by Plant Community Type and Seeding Status: A Region-Wide Assessment of Ecological Benefits and Risks" Plants 9, no. 9: 1113. https://doi.org/10.3390/plants9091113

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