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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Eucalypt regeneration on the Lower Murray floodplain, South Australia.

George, Amy Kathryn January 2004 (has links)
Vegetation along the River Murray floodplains has been shown to be in a severe state of decline. This decline is amplified by the impositions of river regulation. In South Australia, where vegetation losses have been great, regeneration is limited and may result in not only individual tree losses but also widespread population decline. This study aimed to examine the relationship between river flows and the regeneration process in populations of Eucalyptus camaldulensis and Eucalyptus largiflorens. The current structure of the populations was examined to determine if a viable number of varying age-classed trees were present. Tree surveys conducted at Banrock Station determined that while densities were low for both species, E. camaldulensis had a more sustainable population structure than E. largiflorens. Growth stages for both species illustrated highly clumped distribution, which is believed to correspond with river flooding magnitudes and frequencies. To address the potential link between tree distribution and flooding within the River Murray, a hydrological analysis was conducted for Banrock Station using river flows at the South Australian border from 1900 to 2003. The amount of time growth stages for each species were inundated was found to be greatly reduced under regulated flows compared to natural flows. This has resulted in shifted localized regeneration patterns corresponding with E. camaldulensis' greater demand for inundation than E. largiflorens. Moderate magnitude flows have been most impacted by regulation, and consequently these are the very flows needed for floodplain tree population maintenance. Flowering and seed fall for E. camaldulensis and E. largiflorens were monitored at Banrock Station for 22 months to identify losses in reproductive potential resulting from tree decline. While seed viability was not affected by vigour, trees with visually reduced vigour were found to produce less fruit and had reduced seed fall, as well as a reduced rate of fruit development. Dendrochronological techniques were applied to floodplain trees. Age and size relationships could be established, implying that such techniques can be applied in South Australia to high quality sites. Growth responses within cohorts were similar and easily matched between individuals illustrating cyclic, but not necessarily seasonal correlations. This work verified the preferential selection of younger trees for dendroecological studies, and identified a relationship between on moderate flows and measurable girth expansion in both floodplain tree species. / Thesis (Ph.D.)--School of Earth and Environmental Sciences, 2004.
12

A study of cell wall regeneration by Douglas-Fir [Pseudotsuga menziesii (Mirb.) Franco] protoplasts from suspension cultures

Robinson, Kim William. January 1980 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1980. / Includes bibliographical references (p. 58-59).
13

Dynamique d'installation de la regénération dans une pessière ouverte à cladonie localisée dans la zone pessière noire fermée nord du Saguenay-Lac-Saint-Jean (Québec) /

Riverin, Stéphane, January 1994 (has links)
Mémoire (M.Ress.Renouv.)--Université du Québec, 1994. / Résumé disponible sur Internet. CaQCU Document électronique également accessible en format PDF. CaQCU
14

Effets d'un gradient de lumière et de compétition intraspécifique sur la croissance et la morphologie de la cime du sapin baumier (Abies Balsamea (L.) Mill.) /

Lesage, Isabelle, January 1997 (has links)
Mémoire(M. Ress. Renouv.)--Université du Québec à Chicoutimi, 1997. / Document électronique également accessible en format PDF. CaQCU
15

Dynamique spatio-temporelle de germination et de survie d'une cohorte de semis de sapin baumier (Abies balsamea (L.) MILL.) en zone boréale /

Duchesneau, Robin, January 1997 (has links)
Mémoire (M.Ress.Renouv.)--Université du Québec à Chicoutimi, 1997. / Document électronique également accessible en format PDF. CaQCU
16

Structure et croissance d'un peuplement d'épinette noire (Picea mariana) issu d'une coupe d'une vingtaine d'années dans la région du Saguenay-Lac-Saint-Jean /

Fournier, Mylaine, January 1997 (has links)
Mémoire (M.Ress.Renouv.)--Université du Québec à Chicoutimi, 1997. / Document électronique également accessible en format PDF. CaQCU
17

Essai de modélisation de la régénération naturelle après coupe en forêt boréale québécoise /

Dufour, Boris. January 2001 (has links)
Mémoire (M.Ress.Renouv.)--Université du Québec à Chicoutimi, 2001. / Document électronique également accessible en format PDF. CaQCU
18

Croissance juvénile des arbres mères comparée à celle de jeunes semis d'épinette noire (Picea Mariana (Mill) B.S.P.) issus de graines après un feu sur un même site /

Fantin, Natalie, January 1999 (has links)
Mémoire (M.Ress.Renouv.)--Université du Québec à Chicoutimi, 1999. / Document électronique également accessible en format PDF. CaQCU
19

Dynamique de la régénération d'une sapinière du Parc des Grands-Jardins ayant subi une épidémie de la tordeuse des bourgeons de l'épinette et un incendie /

Lemieux, Sonia, January 2001 (has links)
Mémoire (M.Ress.Renouv.)--Université du Québec à Chicoutimi, 2001. / Document électronique également accessible en format PDF. CaQCU
20

Mise en place d'une pessière à cladonie dans le domaine des forêts fermées d'épinette noire (Picea mariana) et potentiel pour la production forestière /

Côté, Damien, January 2004 (has links)
Thèse (M.Ress.Renouv.) -- Université du Québec à Chicoutimi, 2004. / Bibliogr.: f. 62-73. Document électronique également accessible en format PDF. CaQCU

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