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Forest composition and red oak (Quercus sp.) response to elevation gradients across greentree reservoirs

Forest Ecosystems 2023年第5期10卷 607-617页

作者： cassandra hug Pradip Saud Keith McKnight Douglas C.Osborne College of Forestry Agriculturaland Natural ResourcesUniversity of Arkansas at MonticelloMonticelloAR71656USA USFWS/Lower Mississippi Valley Joint Venture TylerTX75707USA Five Oaks Ag Research and Education Center HumphreyAR72073USA

Elevation gradients within forested wetlands have long been recognized for their role in defining species composition through factors such as hydrology and soil *** reservoirs(GTRs)are leveeimpounded tracts of bottomland hardwood forest flooded throughout the winter months to provide habitat for overwintering *** flooding of GTRs alters the forest composition due to flood frequency,depth,and duration in combination with slight changes in *** evaluate the effect of elevation gradients,soil properties,and management techniques in the overstory species composition and red oak(Quercus spp.)species abundance,we inventoried 662 plots across 12 independent GTRs in eastern *** the lower elevations ranging from 50.98 to 54.99 m above sea level,the importance value index(IVI)was highest for nuttall oak(Quercus texana)and overcup oak(Quercus lyrata),whereas IVI shifted to cherrybark oak(Quercus pagoda)in the higher elevations ranging from 54.99 to 58.00 *** diversity did not differ by elevation gradient,soil property,or management technique within *** diversity,using non-metric multi-dimensional scaling(NMDS)analysis,indicated site-specific variability significantly correlated with the environmental predictors,including elevation(R^(2)=0.57),easting(R^(2)=0.47),soil texture(R^(2)=0.21),and pH(R^(2)=0.12).Red oak species-specific mixed-effects modeling of abundance response using Poisson distribution suggested an inverse correlation of nuttall oak and a direct correlation of cherrybark oak abundance with ***,willow oak(Quercus phellos)abundance was not significantly affected by elevation but was by silt loam soil texture and restoration management *** findings will aid management efforts to reduce the dominance of less desirable species that are prominent under specific environmental conditions and promote the dominance of more desirable *** GTR sustainability is increas

关键词： Bottomland hardwoods Diversity Forested wetland Overstory Red oak Soil Thinning and management

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