Comparison of 5th-and 14th-year Douglas-fir and understory vegetation responses to selective vegetation removal

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dc.contributor.authorYıldız, Oktay
dc.contributor.authorCromack, K.
dc.contributor.authorRadosevich, S.R.
dc.contributor.authorGhersa, M. A. Martinez
dc.contributor.authorBaham, J.E.
dc.date.accessioned2020-04-30T22:41:12Z
dc.date.available2020-04-30T22:41:12Z
dc.date.issued2011
dc.departmentDÜ, Orman Fakültesi, Orman Mühendisliği Bölümüen_US
dc.descriptionWOS: 000292428600002en_US
dc.description.abstractThe effects of early vegetation management on the survival and growth of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] were examined 5 and 15 years after planting in the Oregon Coast Range. Our first objective was to document the effects of vegetation species competition upon key ecosystem properties. The second objective was to document the effects of vegetation removal during early Douglas-fir stand establishment upon long-term tree growth and on biomass production by vegetation components. Seven levels of manual vegetation removal were maintained for the first 5 years after planting: 0%, 25%, 50%, 75%, and 100% shrub removal; and 100% shrub removal combined with 50% or 100% herbaceous vegetation removal. Shrub and herb removal did not affect Douglas-fir survival at year five, but treatments providing less than 75% shrub removal significantly reduced Douglas-fir survival by year 15. Removing shrubs and herbs completely (100S + 100H) during the 5 years following tree planting allowed successful tree establishment, with a 366% increase in biomass accumulation per hectare for Douglas-fir in that treatment at the end of 14 years of growth. At 15 years stand age, even with shrub removal alone, a 304% gain in tree biomass per hectare was obtained compared to no vegetation removal (NVR). By stand age 15 years, any increase in the degree of understory removal beyond 75% did not contribute significantly to additional tree survival and growth. The understory vegetation on NVR treatment plots and the herbaceous vegetation on 100% shrub removal (100S) treatment plots, contained >90% and >80% of aboveground biomass N at 5 years, respectively, indicating possible competition for soil N. Soil moisture was not different among treatments at 5 years. Complete vegetation removal (100S + 100H) for 5 years resulted in a significant increase in soil bulk density (P < 0.05), a significant decrease in total soil C (P < 0.05) and no change in total soil N in the upper 15 cm of the mineral soil. By 14 years, however, only the soil bulk density remained greater (P < 0.05) on the 100S + 100H treatment. We conclude that greater tree survival and growth occurred with at least 75% shrub removal. Our results suggest that managers may have substantial flexibility in maintaining a partial understory component suitable for ecosystem productivity, canopy cover and wildlife habitat, while maintaining forests productive for timber resources. (C) 2011 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipDuzce University, TurkeyDuzce University; Oregon State University Forest Science Department; US Forest Service Pacific Northwest Research StationUnited States Department of Agriculture (USDA)United States Forest Service; US Environmental Protection AgencyUnited States Environmental Protection Agencyen_US
dc.description.sponsorshipSupport for the senior author was received from Duzce University, Turkey. Research support came from the Oregon State University Forest Science Department, the US Forest Service Pacific Northwest Research Station, and the US Environmental Protection Agency. We gratefully acknowledge the assistance of Robert G. Wagner, who began the original study and shared key data for tree survival and growth from year 5. The following individuals gave helpful advice on research methods and data analysis: Carol Glassman, Jillian Gregg, Erik Hobbie, Marc Kramer, Dave Myrold, Nan Posavatz, and Chris Swanston. Dan Binkley, Elizabeth C. Cole, Douglas A. Maguire, Vicente J. Monleon, John C. Tappeiner, II, and Richard H. Waring provided helpful manuscript suggestions. Angeline S. Cromack and Kevin T. Cromack edited and formatted the final draft of the paper.en_US
dc.identifier.doi10.1016/j.foreco.2011.04.015en_US
dc.identifier.endpage597en_US
dc.identifier.issn0378-1127
dc.identifier.issn1872-7042
dc.identifier.issue4en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage586en_US
dc.identifier.urihttps://doi.org/10.1016/j.foreco.2011.04.015
dc.identifier.urihttps://hdl.handle.net/20.500.12684/3144
dc.identifier.volume262en_US
dc.identifier.wosWOS:000292428600002en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofForest Ecology And Managementen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectUnderstory vegetationen_US
dc.subjectVegetation competitionen_US
dc.subjectTree growthen_US
dc.subjectForest productivityen_US
dc.subjectLeaf areaen_US
dc.subjectNitrogen resourcesen_US
dc.titleComparison of 5th-and 14th-year Douglas-fir and understory vegetation responses to selective vegetation removalen_US
dc.typeArticleen_US

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