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Showing 1 to 20 of 27 for “"Ulmus"”.
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ELECTROPHYSIOLOGICAL STUDIES ON ULMUS AMERICANA
… such measurements in mesophyll cells of elm (Ulmus americana) leaves. The inquiry entailed the development of the technique for measuring elm leaf cell membrane potentials, the determination of membrane potentials expected of healthy, greenhouse elms, and the effects of various physical and …
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A Cryptic Invasion of the Non-Native Siberian Elm (Ulmus Pumila) to Southwest Missouri
Non-native species invasions are of high ecological importance due to their ability to transform native ecosystems. One such species, Siberian elm, has been shown to have been invading native landscapes across the central and eastern United States since the late 1800s. The natives, American elm and …
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Factores anatómicos y químicos del xilema de Ulmus minor Mill. relacionados con la resistencia a Ophiostoma novo-ulmi Brasier
Las poblaciones de Ulmus minor europeas se encuentran seriamente amenazadas por la grafiosis, la enfermedad más devastadora y difundida de los olmos. Ophiostoma novo-ulmi se desarrolla en el interior de los vasos del xilema cusando su cavitación. Este proceso origina marchitamiento foliar y, en la …
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Palaeoecological studies of selected mires in the Craven District of West Yorkshire with special reference to the late Devensian period and the Ulmus decline
(1) Percentage and absolute pollen diagrams are presented for a lowland site, Sniddle Moss, and two upland sites, Thieves' Moss and Sunset Hole, in the Ingleborough Region, the Craven District, north-west Yorkshire. (2) The analysis of the earliest sediments of Sniddle Moss and Thieves' Moss …
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Rehabilitation of Severely Compacted Urban Soil to Improve Tree Establishment and Growth
… Quercus bicolor Willd. (swamp white oak), Ulmus 'Morton' (Ulmus japonica (Rehd.) Sarg. x Ulmus wilsoniana Schneid.) (Accolade® elm), Prunus 'First Lady' (Prunus xincam x Prunus campanulata) L. and Quercus macrocarpa Michx. (bur oak) were planted in each plot. The PR treatment reduced soil …
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An environmental history of the Navan area of Co. Armagh
… cal BC (5200-4800 BP), this occurred before the Ulmus-decline, suggesting climatic deterioration was not a direct cause.<br/><br/>The major emphasis of this study was on the agricultural history of the area. It was demonstrated that the soils and climate of the area were particularly suited to …
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Spring Phenology and Trophic Ecology of Trees, Caterpillars, and Migrating Neotropical -Nearctic Songbirds
… relative basal area; J. nigra, Q. macrocarpa, Ulmus americana (American elm), and Ulmus rubra (slippery elm)], and avoided a dominant tree species, Acer saccharum (sugar maple). Rare tree species supported more caterpillars per leaf than Acer saccharum, and tree species preferences were …
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Epidemiology and population structure of Xylella fastidiosa, the causal agent of bacterial leaf scorch, among urban trees in the District of Columbia
… frequently with Quercus palustris, Q. rubra, Ulmus americana, and Platanus occidentalis. Eight other symptomatic and five asymptomatic tree species were found infected. The bacterium was also detected on asymptomatic portion of seven tree species. The occurrence of crown dieback was found …
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Interactive Effects of Imazapyr plus Triclopyr Ester and Imazapyr plus Glyphosate Mixtures on Woody Weed Seedlings
… black cherry (Prunus serotina), winged elm (Ulmus alata), sweetgum (Liquidambar styraciflua), red maple (Acer rubrum), black locust (Robinia psuedoacacia), loblolly pine (Pinus taeda), water oak (Quercus nigra) and cabbage palmetto (Sabel palmetto). The seedlings were rapidly screened and …
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Woodpecker Nesting Habitat in a Prairie River Woodland
… woodpeckers typically nested in American elm (Ulmus americana) snag stands with an open canopy and sparse woody understory. Functions involving common clickers or downy woodpeckers were relatively less effective at separating groups because they were more versatile in site selection. Common …
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A panyological study of the impact of man on the landscape of central Southern England, with special reference to the chalklands
… woodland of the chalk and exhibits an early Ulmus decline clearance. Open conditions appear to have prevailed in at least this area of the Hampshire Downs since the Early Neolithic. The Snelsmore data show that from the end of the UImus decline clearance, woodland was a more common feature of …
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Mammal Damage and Movements of Deer Mice in South Dakota Shelterbelts
… Laws. ) . Rabbits preferred Siberian elm (Ulmus pumila L.) and honeysuckle and avoided ponderosa pine. Average home range size was 0. 06 hectares. Movement occurred more on the ground and lower elevations in trees compared to levels at higher elevations. At higher elevations deer mice moved …
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Use of Eastern South Dakota Shelterbelts By Nesting Birds of Prey
… in linear rows. Major tree species included elm (Ulmus spp.), green ash (Fraxinus pennsylvanica), cottonwood (Populus deltoids), Russian olive (Elaeagnus angustifolia), and eastern red cedar (Juniperus scopulorum). Major shrub species included honeysuckle (Lonicera tatarica) and lilac (Syringa …
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The Synax of the Simple Cases and the Cases with Prepostions in Quintus Curtius' History of Alexander, Book VI
<p>The purpose of this dissertation is to investigate the syntax of the simple cases and of the cases with prepositions in Quintus Curtius’ History of Alexander, Book VI. This study attempts to ascertain any divergencies from the Classical norm, which might demonstrate Curtius’ syntax to be …
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The influence of current year fire on leaf litter decomposition rates and microbial enzyme activity in forests undergoing ecological restoration
… Carya tomentosa, Liquidambar styraciflua, and Ulmus alata) ranging from those characteristic of historical open oak woodland to those that are mesophytic, and determined how these decomposition rates differed between restored and unrestored and burned and unburned portions of an upland oak …
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Palynology and Age of the Alvord Creek Formation, Steens Mountain, Southeastern Oregon
… and Ephedra and the angiosperms Quercus, Ulmus, Corylus, Juglans, Fraxinus, and Nyssa. Pollen assigned to the undivided Taxaceae-Cupressaceae-Taxodiaceae group, Quercus and Abies dominate the assemblage; monolete and trilete spores are conspicuously rare.</p> <p>The overall composition of …
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Beetles or Bureaucrats? Reconsidering the United States' Failure to Stop Dutch Elm Disease
… ulmi) epidemic that affected American elm (Ulmus americana) across the country. The disease, a fungus carried by beetles between trees, was introduced in 1930 in New York City and slowly spread across the Northeast United States and beyond. A federal program to save the elm trees was in …
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Growth of Understory Saplings in a Forest Exposed to Elevated Carbon Dioxide
… of Quercus velutina and decreased it for Ulmus alata, with variation among species and years. Leaves in elevated CO2 generally had a higher probability of surviving to a given leaf lifespan. Inherent characteristics such as investment in leaf tissue and relative growth rate at ambient CO2 …
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The vegetational and archaeological history of the Ingleborough Massif, North Yorkshire
… 8730 - 80 BP. After the arrival of Quercus and Ulmus trees, Alnus appeared in the area c. 80 BP but did not reach high numbers until 6400 ± 70 BP. Some evidence of possible early Mesolithic activity during this period was found. Small-scale and short-lived clearance of the mixed-oak woodland …
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Wildlife Habitat Evaluation of the Unchannelized Missouri River in South Dakota
… of trees; the most important were slippery elm (Ulmus rubra), bur oak (Quercus macrocarpa), box elder (Acer negundo), and eastern red cedar (Juniperus virginiana). Grazing of the understory and ground cover reduced the value of this habitat to most types of wildlife (6.7). Sand dunes were …
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