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Accueil du site → Doctorat → Autriche → Spatial and temporal analysis of management impacts on ecosystem services : scenario modeling in a highland watershed of northwest Ethiopia

Universität für Bodenkultur Wien (2015)

Spatial and temporal analysis of management impacts on ecosystem services : scenario modeling in a highland watershed of northwest Ethiopia

Mulu, Menale Wondie

Titre : Spatial and temporal analysis of management impacts on ecosystem services : scenario modeling in a highland watershed of northwest Ethiopia

Auteur : Mulu, Menale Wondie

Université de soutenance : Universität für Bodenkultur Wien

Grade : Doctor of Philosophy (PhD) 2015

Résumé
The objective of the study was to find ecosystem-service-based development options to improve the living conditions of the people in the highlands of northwest Ethiopia. A set of tools was applied to a demonstration watershed. Participatory resource assessment focusing on ecosystem services (ESs) was conducted by using interviews, focus group discussions, reviews, field surveys and informal meetings with stakeholders. The dynamics of the landscape from 1957 to 2013 was analyzed using aerial photographs and satellite images. The Drivers-Pressures-States-Impacts-Responses (DPSIR) framework was used for the ecosystem-services-scenario-modeling. The pathways of scenarios were evaluated by a combination of qualitative and quantitative analyses of land cover - land use types (LCUTs) and ESs. Subsistence, cultural or religious, and environmental services were the major ESs found in Tara Gedam. The analysis of remote sensing data showed an overall increase of cropland and a decrease of other LCUTs. Land use conversion predominantly occurred from forest or shrubland to cropland. Improved crop varieties and management can increase the yield 2-3 fold. The increased productivity would offer sufficient time and land for fallowing, exclosures and rehabilitation. Business as Usual, Transition Agriculture, Intensive Agriculture and Optimized Ecosystem Services were the scenarios defined as development options suiting the highland watershed using the DPSIR framework. TAG could be chosen as a rapid response of a low economy community. INA emphasizes food security, whereas OPE pays due attention to food security and environment protection simultaneously. The application of either INA or OPE will improve the living condition of subsistence farming. OPE better ensures the provision of diversified and economically valuable ES. Population growth, policy and technology are presumed to be the major ESs stressors. Future ES development requires integrated approaches to improve food security

Mots clés : Ökosystemleistungen / Intensivlandwirtschaft / Fernerkundung / Szenariotechnik / Tara Gedam / Teff — Ecosystem services / Intensified agriculture / Optimized ecosystem services / Remote sensing / Scenario modeling / Tara Gedam / Teff

Présentation (österreichischen Bibliothekenverbundes)

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Page publiée le 27 décembre 2015, mise à jour le 13 mars 2019