Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1931. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed July 9, 2010)

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1930. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed October 9, 2009) Includes bibliographical references.

Die Ausbreitung von Diasporen ist ein zentraler Abschnitt des pflanzlichen Lebenszyklus. Insbesondere Fernausbreitung (>100 m) hat erhebliche Auswirkungen auf eine Vielzahl von biologischen Prozessen, ist aber mit empirischen Messmethoden kaum erfassbar. Ziel der Arbeit ist es daher, die Fernausbreitung von Diasporen aus der Sicht der Mikrometeorologie zu modellieren. Numerische Berechnungsverfahren sind dazu experimentell zu prüfen im Hinblick auf die Wiedergabe der turbulenten Verhältnisse in einem konkreten Messgebiet und an parallel zu diesen Messungen beobachteten Ausbreitungsbedingungen für spezielle Diasporen. Hier wird das Konzept für ein solches Ausbreitungsberechnungsverfahren erläutert und erste Ergebnisse vorgestellt. / Diaspore dispersal is a very important chapter in the life cycle of many plants. In particular long range transport (>100m) has significant effects on many biological processes, but is not ascertainable by empirical measurements. So the objective of this work is to model the long range dispersion of diaspores using micrometeorological methods. Numerical calculations must reproduce the experimentally observed turbulent conditions and the propagation of special seeds within a concrete landscape. The concept of such a numerical model and first results are described here.

Thesis (doctoral)--Universität Marburg, 2001. / Also available in PDF format. Includes bibliographical references (p. 89-102).

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1929. / The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed October 30, 2009) Includes bibliographical references.

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1936. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed July 21, 2010)

Techn. Universiẗat, Diss., 2006--München.

No description available.

No description available.

This thesis examined the efficacy of residual forest structure for the preservation and recovery of bryophytes five to six years after partial canopy harvest in boreal mixed-wood forests of northwestern Alberta, Canada. Bryophytes were sampled in two forest types that differed in pre-harvest abundance of broadleaf (primarily Populus tremuloides Michx. and P. balsamifera L.) and coniferous (primarily Picea glauca (Moench) Voss) canopy trees. In Chapter 2, epiphytic bryophytes growing on aspen (P. tremuloides) were characterized by species viability and nearest-neighbour relationships. Epiphyte assemblage structure showed increasing impact with declining retention owing to degradation of growing conditions for species on trees. Chapter 3 provided an analysis of species richness and abundance patterns in relation to residual canopy structure. Bryophytes generally benefitted from higher canopy retention; however, epixylic and epiphytic species were more sensitive to partial harvesting than species on other substrates, and liverworts were more sensitive than mosses. Liverworts exhibited higher among-site differences in richness as retention declined, which partly resulted from increasing numbers of local species extinctions. In an analysis of species-environment relations in partially-harvested forests in Chapter 4, forest moisture was reduced with any degree of harvesting in both forest types. Lower canopy retention and forest moisture levels were associated with reduced abundances of species with particular biological traits, such as limited reproduction and dispersal capacities. Their re-establishment after harvesting may be impeded because of biological and environmental limitations. Coniferous-dominated forests supported higher abundances of liverworts and species with greater moisture requirements than did mixed-wood broadleaf-coniferous forests, and are potentially important refuges of bryophyte source populations. Chapter 5 examined the capacity for bryophyte species to germinate from diaspore banks in forest soils. Species germinated readily from mineral soil samples obtained from harvested sites, including several perennials characteristic of intact forests. Diaspore banks may serve as a persistent source for species colonization at post-disturbance sites, but only under appropriate growing conditions and not for species that were most sensitive to harvesting. Overall, both amount and composition of forest structure retained after partial harvesting are important management considerations for ensuring conservation of the wide variety of bryophyte species in mixed-wood landscapes. / Conservation Biology