Global ETD Search

1	Quantifying stand structure and structural complexity along a management gradient in temperate forests Stiers, Melissa 21 August 2020 (has links) No description available. 634 terrestrial laser scanning stand structural complexity Fagus sylvatica Management intensity primary forests Forstwirtschaft (PPN621305413)
2	Root traits across environmental gradients in pristine Swedish forests Vöhringer, Naomi January 2023 (has links) Forests account for a large portion of global carbon storage. Almost half of this carbon is stored underground. Roots, especially fine-roots (diameter ≤ 2 mm) are an important part of soil carbon, and play a number of ecological roles. Yet, the below-ground parts of trees are still poorly understood. The aim of this report was to understand environmental controls over plants traits. I tested if plants shift their root traits towards a resource conservative strategy when environmental conditions are challenging (dry and cold). Furthermore, the contribution of different fine-root diameters to total root length (TRL), surface area (SA) and root volume (VO) was assessed. Root traits such as TRL, SA, VO, fine-root diameter, specific root length (SRL) and root tissue density (RTD) were quantified. The root samples are taken from 11 old growth Swedish forests across a climate gradient in three different soil moisture categories per forest (dry, intermediate, wet). Fine-roots were scanned, and analysed with the RhizoVision Explorer Software (Version 2.0.3). Uni-factorial ANOVAs, combined with Tukey’s posthoc test, or linear regressions were conducted, and the results revealed no significant effects of the summer air temperature on root traits. However, higher soil moisture was found to decrease RTD, but increase fine-root diameters significantly. These findings did not confirm the plants aim on building resource conservative root traits in challenging conditions. Instead, they highlighted variability among and within forests suggest that multiple factors influence root morphology and function. This study contributes to our understanding of how fine-roots respond to environmental conditions. fine-root traits boreal forests primary forests soil moisture temperature Environmental Sciences Miljövetenskap Forest Science Skogsvetenskap
3	L'évolution du droit de l'environnement au regard du concept de développement durable dans les pays de l'Afrique de l'Ouest francophone / The Evolution of Environmental Laws in connection with the concept of Sustainable Development in French-speaking west African countries Dohou, Hontongnon Expédit Léon 17 February 2015 (has links) Le concept de développement durable fut promu à la Conférence de Rio de 1992avec l’adoption d’un certain nombre d’instruments juridiques. Le droit africain s’estprobablement adapté aux règles et aux principes inhérents au concept avec, commeconséquence, la refonte ou la révision des codes ou lois de protection del’environnement. Face aux problèmes environnementaux récurrents, à la difficilegestion intégrée des ressources en eau, à l’opérationnalisation critique de la solidaritéà l’eau potable pour tous, à la gouvernance environnementale défaillante, la questionde l’évolution efficiente du droit de l’environnement africain au regard du conceptde développement durable se pose. Il se révèle un insuccès de la saisie du conceptpar le droit africain. Au final, un nouveau modèle de droit de l’environnement, auprofit des pays de l’Afrique de l’Ouest, s’avère nécessaire. / The concept of sustainable development was promoted in the Rio Conference in1992 with the adoption of a number of legal instruments. African law has probablyadapted to the rules and principles inherent to the concept with, as a consequence,consolidation or revision of codes and laws to protect the environment. Facingrecurrent environmental problems, the difficult Integrated water resources, criticaloperationalization of solidarity drinking water for all, the failed environmentalgovernance, the question of the efficient development of the law of the Africanenvironment in relation to the concept of sustainable development arises. It proves afailure in the seizure of the concept by the African law. Finally, a new model ofenvironmental law in favor of the countries of West Africa is necessary. Principes Règles Santé environnementale Participation au processus décisionnel Installations classées Air Sol Forêts primaires Sylviculture Biodiversité Eau Zones humides Solidarité à l'eau Espèces invasives Espèces aquatiques Modes traditionnels de protection Eie Ees Rse Gouvernance Partenariat Éducation Solidarité Principles Rules Environmental health Participation in decision making Classified facilities Air Soil Primary forests Forestry Biodiversity Water Wetlands Solidarity water Invasive species Aquatic species Traditional methods of protection Eie Ees Rse Governance Partnership Education Solidarity 340

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