that 286,000 ha in Arkansas were affected by the oak decline. In 2002 and 2003, Guldin et al. (2006) established 181 field plots in Arkansas, Missouri, and Oklahoma and estimated that 33% of red oak density (trees/ha) and 30% of red oak basal area in the region were dead or dying. Kabrick et al. (2004) studied nine forested sites in southern Missouri ranging in size from 312 to 514 ha. They rep...

We used an information-theoretic approach to investigate nest-site selection by black-capped vireos (Vireo atricapilla) at the landscape and habitat-patch scales on Fort Hood Military Reservation in central Texas, USA, during 2003 and 2004. We used a use–availability sampling design and logistic regression to compare woody cover characteristics at nests to random points in the landscape to dete...

Oak decline is a general term used for the progressive dieback and eventual mortality of oak trees due to many compounding stressors, typically combination predisposing, inciting, contributing factors. While pinpointing individual causes in challenge, past studies have identified site stand characteristics associated with decline. In this study, we developed risk map Daniel Boone National Fores...

Mixed forests are usually associated with higher aboveground carbon storage compared to the corresponding monocultures but information on impact of tree species mixing soil organic (SOC) is still limited. Yet, maximizing SOC crucial for ecosystem C sequestration and many other services. This study used a triplet approach (ie. two-species mixed stand respective pure stands at same site) assess i...

We developed new equations to predict Oregon white oak (Quercus garryano Dougl. ex Hook.) development within ORGANON, a stand-development model that is widely used in the Pacific Northwest. Tree size, competitive status, crown ratio, and site productivity were statistically significant predictors of growth and mortality. Three scenarios were projected with the new equations, the previous ORGANO...

Owing to high rates of introgressive hybridization, the plastid genome is poorly suited to fine-scale DNA barcoding and phylogenetic studies of the oak genus (Quercus, Fagaceae). At the tips of the oak plastome phylogeny, recent gene migration and reticulation generally cause topology to reflect geographic structure, while deeper branches reflect lineage divergence. In this study, we quantify t...

In this paper, we describe the process of assessing tower footprint climatology, spatial variability of site vegetation density based on satellite image analysis, and sensor location bias in scaling up to 1 km 1 km patch. Three flat sites with different vegetation cover and surface heterogeneity were selected from AmeriFlux tower sites: the oak/grass site and the annual grassland site in a sava...

1 Multiple factors are known to influence tree seedling establishment, yet the degree to which these factors depend on each other and on spatial context is largely unknown. We examined the influence of herbaceous competition and water and nitrogen limitations on tree seedling establishment as functions of distance from trees (within-site spatial context) and site history (between-site spatial c...