- About
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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.
Search results
Showing 1 to 10 of 11 (0.084 seconds)| 1 |
Ozone toxicity in higher plants and its modulation by the environmentMehlhorn, H. H. January 1988 (has links)
No description available.
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Phytochrome and photoperiodism in Pharbitis nilLee, H. S. J. January 1984 (has links)
No description available.
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Studies of stress responses in Gramineae (Poaceae) using biotechnological methodsAghdaei, Seyed Reza Tabaei January 1997 (has links)
No description available.
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Interactions between calcium and heavy metals in Norway spruce : accumulation and binding of metals in wood and bark /Österås, Ann Helén, January 2004 (has links)
Diss. (sammanfattning) Stockholm : Univ., 2004. / Härtill 5 uppsatser.
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Food-web interactions and population variability of leaf beetles in managed and natural willow stands /Dalin, Peter, January 2004 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2004. / Härtill 5 uppsatser.
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Growth of retained Scots pines and their influence on the new stand /Jakobsson, Rikard, January 2005 (has links) (PDF)
Diss. (sammanfattning). Umeå : Sveriges lantbruksuniversitet, 2005. / Härtill 4 uppsatser.
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Induced plant responses in willow to a gall-forming insect /Höglund, Solveig, January 2006 (has links) (PDF)
Lic.-avh. Uppsala : Sveriges lantbruksuniversitet, 2006. / Härtill 2 uppsatser. Felaktigt institutionsnamn i publikationen. Rätt namn: Department of Entomology.
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Intraspecific Trait Plasticity in Coffee Agroforestry Systems of Costa RicaGagliardi, Stephanie 18 March 2014 (has links)
Although a common plant response to environmental gradients, leaf trait plasticity is often uncharted in agroforestry systems. The objective of this study was to examine the effect of a i) local-scale gradient (light, nutrients) induced by shade tree diversity and ii) large-scale gradient (climato-edaphic) induced by altitude on coffee plant response on multiple agroforestry research farms in Costa Rica. Results show large variability of coffee traits: leaf photosynthetic rates, specific leaf area (SLA) and number of fruiting nodes deviate along both gradients. Mean SLA increased with increasing shade tree diversity. However, with increasing altitude, full sun coffee photosynthesized at higher rates than shaded coffee. Concurrently, other coffee leaf physiological and morphological traits differentiated between full sun and shaded coffee with increasing altitude. Results suggest soil moisture and light availability dominate environmental correlates to intraspecific coffee trait plasticity, providing insight to sources of coffee performance variability in monoculture and agroforestry systems.
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Intraspecific Trait Plasticity in Coffee Agroforestry Systems of Costa RicaGagliardi, Stephanie 18 March 2014 (has links)
Although a common plant response to environmental gradients, leaf trait plasticity is often uncharted in agroforestry systems. The objective of this study was to examine the effect of a i) local-scale gradient (light, nutrients) induced by shade tree diversity and ii) large-scale gradient (climato-edaphic) induced by altitude on coffee plant response on multiple agroforestry research farms in Costa Rica. Results show large variability of coffee traits: leaf photosynthetic rates, specific leaf area (SLA) and number of fruiting nodes deviate along both gradients. Mean SLA increased with increasing shade tree diversity. However, with increasing altitude, full sun coffee photosynthesized at higher rates than shaded coffee. Concurrently, other coffee leaf physiological and morphological traits differentiated between full sun and shaded coffee with increasing altitude. Results suggest soil moisture and light availability dominate environmental correlates to intraspecific coffee trait plasticity, providing insight to sources of coffee performance variability in monoculture and agroforestry systems.
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Overstory density and disturbance impacts on the resilience of coniferous forests of western OregonNeill, Andrew R. (Andrew Rhodes) 09 March 2012 (has links)
A trait based approach was used to assess impacts of overstory density and thinning on understory vegetation components related to wildlife habitat. The relationship between overstory basal area and understory vegetation for species grouped by traits, such as production of flowers, fleshy-fruit and palatable leaves, was characterized in thinned and unthinned stands at seven Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forests in western Oregon six years following harvests. The ranges of overstory densities within thinned and unthinned stands represent gradients of resource availability and thinning disturbance. Lower overstory densities and thinnings were associated with improved ecosystem functions, specifically the provision of wildlife habitat, as evident by higher cover of flowering and fleshy-fruit and palatable leaf producing species. Greater cover of drought, fire and heat tolerant species in low density stands and after thinnings suggested that these ecosystem functions are more likely to be maintained under climate change conditions, indicating higher resilience. The response of specific functions and response types reflect the traits characteristic for each species group and the impact of these traits on sensitivity to resource availability and disturbances. Thus, the correlation between grouping criteria and the main gradients created by management activities can provide an indication of the expected vegetation response, and therefore the impact of management practices on resilience. / Graduation date: 2012
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