Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Coniferous Forests"”.
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Nitrogen deposition and nitrification in coniferous forests’
… deposition on soil solution chemistry of six coniferous forest sites the presence of live roots, b) the impacts of (NH4)2SO4 deposition on Norway spruce (Picea abies [L.] Karst) and Scots pine (Pinus sylvestris L.) fine roots, and c) the controls of nitrification in an acid forest soil. The …
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ΕΡΕΥΝΕΣ ΕΠΙ ΚΥΑΝΟΦΥΚΩΝ ΕΔΑΦΟΥΣ ΠΕΡΙΟΧΩΝ ΤΗΣ ΕΥΒΟΙΑΣ. ΤΑΞΙΝΟΜΙΚΗ, ΧΛΩΡΙΔΙΚΗ ΦΥΤΟΓΕΩΓΡΑΦΙΚΗ, ΟΙΚΟΛΟΓΙΚΗ ΜΕΛΕΤΗ
… (CEREALS, VEGETABLES, VINE-YARDS, OLIVE GROVES, CONIFEROUS FORESTS, MAQUIS AND AREAS WITH PHRYGANIC VEGETATION. SOME TAXA OF THE INVESTIGATED CYANOPHYTA, AS IT HAS BEEN FOUND BY EXPERIMENTS IN THE LABORATORY, HAVE THE CAPACITY TOGROW IN THE DARK WHILE OTHERS FORM WATER-STABLE AGGREGATES OF SOIL.
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Effects of Infanticide Risk and Timber Harvest on American Black Bear Space Use
… use did not differ between deciduous stands and coniferous stands, or among land cover types except that grass/pasture and open water were avoided. Bear use was greater in areas farther from roads. Managing the amount of black bear resources appears possible by considering the number, size, type, …
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MEASUREMENTS AND MODEL PREDICTIONS OF HYDROXYL RADICAL, PEROXY RADICALS, AND NITROUS ACID: EVIDENCE OF MISSING SOURCES OR SINKS IN FORESTED AND INDOOR ENVIRONMENTS
… been made in improving OH agreement in deciduous forests, HO2 and RO2 model disagreement persists. Measurements of radicals spanning three forested campaigns are compared through a chemical coordinate analysis and suggest that newly proposed radical loss pathways still cannot account for the …
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Forests in a changing world: conifer leaf traits, community shifts, and climate change adaptation
… patterns of functional biodiversity in current forests, the degree of changes they have experienced in response to climate change, and the synergy between more traditional and more novel management techniques. In this dissertation, I present work that addresses these knowledge gaps in the …
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Forest floor seed banks and their response to slashburning in some forest ecosystems in south central British Columbia
… but little is known about those of temperate coniferous forests in B.C., or their response to different disturbances. As a result, a study of forest floor seed banks and their response to the common disturbances of clearcutting and slashburning, was conducted in the Engelmann Spruce - …
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THE ECOLOGY OF TICK-BORNE RELAPSING FEVER IN WESTERN NORTH AMERICA
… R<sub>0</sub>. We confirmed the suitability of coniferous forests at higher elevations for the presence <i>O. hermsi</i> and identified constraints on this distribution. <i>O. hermsi</i> and <i>B. hermsii</i> were sensitive to temperature extremes throughout the year. Models for global climate …
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THE ECOLOGY OF TICK-BORNE RELAPSING FEVER IN WESTERN NORTH AMERICA
… R<sub>0</sub>. We confirmed the suitability of coniferous forests at higher elevations for the presence <i>O. hermsi</i> and identified constraints on this distribution. <i>O. hermsi</i> and <i>B. hermsii</i> were sensitive to temperature extremes throughout the year. Models for global climate …
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THE CHARACTERIZATION AND MODELLING/OF SOIL WATER PATHWAYS BENEATH A CONIFEROUS HILLSLOPE IN MID WALES
Streams draining coniferous plantations contain higher loadings of hydrogen ion, aluminium, sulphate and nitrate, in comparison with streams in adjacent grasslands. Almost all of this ion-load is transported to streams via subsurface water-pathways. An incontrovertible, physical characterization of …
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Acidification and eutrophication of forests on sandy soil: effects of forest type and deposition load
Forests on sandy soil did clearly acidify during the past decades, what was found to be related to high depositions of potentially acidifying compounds to the forest floor. Several factors are a stimulus for high atmospheric deposition load in these types of forest ecosystems. (1) Forests are often …
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The Water Table and Soil Moisture Response Following the Removal of Conifers from an Encroached Meadow
… role in the physical and biologic processes of coniferous forests in the western United States. However, due to climate change, over grazing, and fire suppression, conifer encroachment into meadows has accelerated. In some western regions, nearly half of all meadow habitat has been loss due to …
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The Effects of Vegetation on Stream Bank Erosion
… to erosion by fluvial entrainment. Riparian forests had a greater density of larger diameter roots, particularly at the bank toe where the hydraulic stresses are the greatest. These larger roots (diameters > 0.5 mm) provided more resistance to erosion than the very fine roots of herbaceous …
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Forest Mortality in Lake Tahoe Basin from 1985-2010: Influences of Forest Type, Stand Density, Topography and Climate
… Tahoe Basin in the central Sierra Nevada. In coniferous forests of the western U.S. and Europe, increased stand density resulting from forest management and land use practices is widely hypothesized to increase forest-wide mortality levels (Dobbertin et al. 2007; Guarín and Taylor 2005; Millar …
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Kolefnisbinding og vöxtur mismunandi skógargerða í þremur skógum á Suðvesturlandi Heiðmörk, Nesjavöllum og Ölfusvatni
Eitt af mikilvægum hlutverkum skógræktar er að binda koldíoxíð (CO2) úr andrúmslofti og geyma sem kolefni (C) í lífmassa og jarðvegi til lengri tíma. Aukin umræða og kröfur um notkun ábyrgra aðferða til þess að meta kolefnisbindingu skóga var aðal kveikjan að þessari rannsókn. Markmið þessa …