UnivTrevesV1, Main, Exploration, bibRecord, 001B51

Retrospective studies of grazing-induced land degradation: a case study in central Crete, Greece

Identifieur interne : 001B51 ( Main/Exploration ); précédent : 001B50; suivant : 001B52

Retrospective studies of grazing-induced land degradation: a case study in central Crete, Greece

Auteurs : P. Hostert [Allemagne] ; A. Röder [Allemagne] ; J. Hill [Allemagne] ; T. Udelhoven [Allemagne] ; G. Tsiourlis [Grèce]

Source :

International journal of remote sensing : (Print) [ 0143-1161 ] ; 2003.

RBID : Pascal:03-0523792

Descripteurs français

Pascal (Inist)
- Crète, Dégradation, Occupation sol, Variation spatiotemporelle, Etude cas, Puits, Pression, LANDSAT, Thematic Mapper, Végétation, Stabilité, Télédétection spatiale, Contrainte, Condition aux limites, Télédétection multispectrale, Cartographie, Surpâturage.
Wicri :
- topic : Cartographie.

English descriptors

KwdEn :
- Crete, Landsat, Overgrazing, Space remote sensing, Thematic Mapper, boundary conditions, cartography, case studies, degradation, land cover, multispectral remote sensing, pressure, spatiotemporal variations, stability, stress, vegetation, wells.

Abstract

Although it is well known that livestock husbandry has become more prevalent in Crete, Greece, during the last two decades, it is not well understood how grazing pressure differs spatially and how it influences grazed rangelands over time. To enhance the understanding of spatio-temporal degradation processes, a 20-year time series of Landsat Thematic Mapper and Multi-Spectral Scanner data is analysed. A set of vegetation fraction images is derived, based on a rigorous pre-processing scheme and linear spectral unmixing. Patterns of vegetation degradation, stability and regeneration are subsequently mapped by means of a trend analysis. It can be concluded that about 40% of the central Cretan rangelands show a declining trend in vegetation cover between 1977 and 1996. A deeper understanding of the underlying driving forces can be achieved through integrating remote sensing-derived information with other geoinformation sources. A comparison between local stress factors and vegetation development reveals that degradation processes are most evident when boundary conditions are favourable. It is, hence, assumed that increased grazing pressure is a major driving force for decreasing vegetation cover in the long term.

Affiliations:

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Le document en format XML

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<term>Télédétection spatiale</term>
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<front><div type="abstract" xml:lang="en">Although it is well known that livestock husbandry has become more prevalent in Crete, Greece, during the last two decades, it is not well understood how grazing pressure differs spatially and how it influences grazed rangelands over time. To enhance the understanding of spatio-temporal degradation processes, a 20-year time series of Landsat Thematic Mapper and Multi-Spectral Scanner data is analysed. A set of vegetation fraction images is derived, based on a rigorous pre-processing scheme and linear spectral unmixing. Patterns of vegetation degradation, stability and regeneration are subsequently mapped by means of a trend analysis. It can be concluded that about 40% of the central Cretan rangelands show a declining trend in vegetation cover between 1977 and 1996. A deeper understanding of the underlying driving forces can be achieved through integrating remote sensing-derived information with other geoinformation sources. A comparison between local stress factors and vegetation development reveals that degradation processes are most evident when boundary conditions are favourable. It is, hence, assumed that increased grazing pressure is a major driving force for decreasing vegetation cover in the long term.</div>
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Retrospective studies of grazing-induced land degradation: a case study in central Crete, Greece

Retrospective studies of grazing-induced land degradation: a case study in central Crete, Greece

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri