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Ben Gurion University of the Negev (2014)

Evaluation of ecosystem responses to land-use change with remote sensing in desertified semi-arid areas

Paz-Kagan Tarin

Titre : Evaluation of ecosystem responses to land-use change with remote sensing in desertified semi-arid areas

Auteur : Paz-Kagan Tarin

Université de soutenance : Ben Gurion University of the Negev

Grade : Doctor of Philosophy (PhD) 2014

Résumé partiel
Land use has transformed a large proportion of the planet’s terrestrial surface from natural ecosystems to human-dominated systems. These changes cause modifications in ecosystem structure and function by changing biodiversity, productivity, and soil quality. Land-use changes (LUCs) of terrestrial systems affect ecosystem responses such as hydrological processes, climatic processes, biogeochemical flux, human health, and biological diversity. These responses involve complex processes, interactions, and feedbacks in different spatial and temporal scales. This PhD thesis attempt to addresses two main objectives in ecosystem studies : (1) generate a theoretical framework for quantifying and evaluating the attributes of ecosystem response as a consequence of LUCs, and to test the validity of this framework through remote sensing derived products, and (2) to develop new techniques and methods for monitoring these changes on various spectral, spatial, and temporal scales with remote sensing means. The current study was carried out in four different land use sites in the desertified dryland of the northern Negev Desert, Israel. To evaluate ecosystem responses to LUCs, two environmental indicators were selected –soil quality and primary productivity. The dissertation has an introduction chapter in which the teoretical background is desribed along with the research goal and specific objectives. The main part of the dissertation consists of four articles as main chapters, each addressing the specific knowledge gapes and specific study objectives. At the beginning of the dissertation ther is a scientific background of ecosystem responses to LUCs by remote sensing in desertified drylands and at the end of the dissertation, a synthesis for the framework of ecosystem responses to LUCs by remote sensing in desertified drylands is formulated at different spectral, spatial, and temporal scales.

Mots clés : Ecological assessment (Biology) — Arid regions — Remote sensing — Ecological disturbances — Israel — Negev — Remote sensing — Environmental impact analysis — Landscape assessment — Arid regions — Remote sensing

Présentation (BGU)

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Page publiée le 10 novembre 2016, mise à jour le 21 novembre 2018