Predisposing factors’effects on mortality of oak (Quercus) and hickory (Carya) species in mature forests undergoing mesophication in Appalachian Ohio  

作　　者：Don C.Radcliffe David M.Hix Stephen N.Matthews 

机构地区：[1]School of Environment and Natural Resources,The Ohio State University,2021 Coffey Road,Columbus OH 43210,USA [2]School of Environmental and Forest Sciences,University of Washington,Box 352100,Seattle WA 98195-2100,USA

出　　处：《Forest Ecosystems》2021年第1期81-94,共14页森林生态系统（英文版）

基　　金：funded by United States Department of Agriculture Forest Service Northern Research Station agreement 15-CS-11242302-122(to S.N.M.);the Ohio Agricultural Research and Development Center SEEDS Project OHOA1572(to D.M.H.);The Ohio Agricultural Research and Development Center and The Ohio State University provided fellowship funding to D.C.R。

摘　　要：Background:Mature oak(Quercus spp.)and hickory(Carya spp.)trees are gradually being replaced by more shadetolerant tree species across the eastern U.S.,likely due to fire suppression and increased precipitation.Oaks and hickories are highly valuable to wildlife;therefore,studying their mortality patterns can provide information on the longevity of habitat quality for many animal species.Oak mortality has most often been studied following large oak decline events,but background mortality rates in forests with aging oak and hickory canopies warrant equal attention,especially in the context of widespread oak and hickory regeneration failure.Methods:We studied background mortality rates of five oak and one hickory species over a 23–25 year time period(1993–1995 to 2018),using 821/20th hectare permanent plots on the Marietta Unit of the Wayne National Forest in southeastern Ohio.We calculated mortality rates based on remeasurement of individual trees for white oak(Quercus alba),chestnut oak(Quercus montana),northern red oak(Quercus rubra),black oak(Quercus velutina),scarlet oak(Quercus coccinea),and pignut hickory(Carya glabra).For each of these species other than scarlet oak,we also modeled the relationships of mortality probability with a priori topographic,soil,stand structural,and individual tree covariates,using a mixed-effects logistic regression framework.Results:The species with the highest mortality rate was scarlet oak(61.3%),followed by northern red oak(41.4%),black oak(26.7%),pignut hickory(23.9%),white oak(23.4%),and chestnut oak(19.1%).In our models,northern red oak mortality was associated with more mesic slope positions,shallower solums,more acidic soils,and older stand ages.Pignut hickory and chestnut oak mortality rates were associated with higher basal areas on the plot,while white oak mortality showed the opposite pattern.Conclusions:Our data suggest that red oak subgenus trees in mature forests of our area will become increasingly uncommon relative to white oak subgenus trees,as the result of

关 键 词：MORTALITY QUERCUS CARYA Mesophication Wildlife habitat 

分 类 号：S718.5[农业科学—林学]