Recherches Biog Ographiques Sur Les Steppes Du Nord De L Afrique
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Recherches Biog Ographiques Sur Les Steppes Du Nord De L Afrique
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Author : Henri-Noël Le Houérou
language : fr
Publisher:
Release Date : 1992
Recherches Biog Ographiques Sur Les Steppes Du Nord De L Afrique written by Henri-Noël Le Houérou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
CE TRAVAIL EST UNE SYNTHESE SUR LES STEPPES ARIDES DU NORD DE L'AFRIQUE . IL INCLUT LES RECHERCHES EFFECTUEES PAR L'AUTEUR SUR LE SUJET PENDANT PLUS DE 40 ANS. LE MEMOIRE COMPREND 8 PARTIES PRINCIPALES: INTRODUCTION, PROBLEMATIQUE GENERALE, ANALYSE FLORISTIQUE ET PHYTOGEOGRAPHIQUE DES STEPPES DE LA ZONE ARIDE, CONCLUSIONS GENERALES, BIBLIOGRAPHIES (550 REFERENCES), FIGURES HORS-TEXTE (13) , PLANCHES PHOTOGRAPHIQUES (49) ET TABLEAUX ANNEXES (VI TABLEAUX, 137 P.). LA ZONE CONCERNEE COMPREND LES 5 PAYS DU NORD DE L'AFRIQUE: EGYPTE, LIBYE, TUNISIE, ALGERIE, MAROC. LES STEPPES ARIDES COMPRENNENT LES PORTIONS DE CE PAYS SITUEES ENTRE LES ISOHYETES DE 100 ET 400 MM DE PLUVIOSITE MOYENNE ANNUELLE. L'OUVRAGE COMPREND UNE PARTIE DESCRIPTIVE SUR LES STEPPES LEURS LIMITES ET LEURS SUBDIVISIONS SUR DES BASES BIOCLIMATIQUES, PHYTOGEOGRAPHIQUES, ZOOGEOGRAPHIQUES ET AGRONOMIQUES ET UNE PARTIE ANALYTIQUE ORIGINALE SUR LA FLORE ET LA PHYTOGEOGRAPHIE DES STEPPES ET LEUR COMPARAISON AVEC LES IBERIQUES, PROCHE-ORIENTALES , LE SAHARA ET LA PRESQU'ILE ARABIQUE. CETTE PARTIE DECRIT EN DETAIL UN ELEMENT PHYTOCHORIQUE: L'ELEMENT IBERO-MAGHREBIN QUI CONSTITUE LE PENDANT OCCIDENTAL DE L'ELEMENT IRANO-TOURANIEN D'ORIENT. CES DEUX ELEMENTS CONSTITUENT LA ZONE MEDITERRANEEO-STEPPIQUE FORMEE DE 80% D'ESPECES D'AFFINITE CMAIREMENT MEDITERRANEENNE ET MOINS DE 10% D'ELEMENTS TROPICAUX
Bioclimatologie Et Biog Ographie Des Steppes Arides Du Nord De L Afrique
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Author : Henri-Noël Le Houérou
language : fr
Publisher: Ciheam - Iam
Release Date : 1995
Bioclimatologie Et Biog Ographie Des Steppes Arides Du Nord De L Afrique written by Henri-Noël Le Houérou and has been published by Ciheam - Iam this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Bioclimatology categories.
Bioclimatology And Biogeography Of Africa
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Author : Henry N. Houérou
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-12-10
Bioclimatology And Biogeography Of Africa written by Henry N. Houérou and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-12-10 with Science categories.
Covering an area of over 130 million km2 spanning the Mediterranean, equator and tropics, the African continent features a spectacular geographic diversity. Consequently, it is characterised by extremely variable climatic, edaphic and ecological conditions, associated with a wide range of natural vegetation and wildlife, as well as human population density, crops and livestock. In this book, Henry Le Houérou presents his bioclimatic and biogeographic classification of Africa. The extensive data provide the basis for comparisons between various African regions, and with regions on other continents such as Latin America or the Indian subcontinent. The results constitute a rational basis for national, regional and sub-regional rural development planning, and for agricultural research dealing with aspects such as plant and animal introductions, the extrapolation or interpolation of experimental or developmental findings, and ecosystems dynamics. Possible problems of applications are also examined.
Desertification And Risk Analysis Using High And Medium Resolution Satellite Data
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Author : Alberto Marini
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-11-27
Desertification And Risk Analysis Using High And Medium Resolution Satellite Data written by Alberto Marini and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-11-27 with Science categories.
This work becomes with methodological rigor a part of the innovative proposals for the characterization of the areas at risk of desertification. The complexity of the phenomenon of desertification, which involves extended surfaces in all continents, is one of the most alarming processes of the environmental degradation of our Planet and threatens the health and the living conditions of over a billion of persons. The food crisis, in continuous increase, ask for the world of research to urgently supply reassuring solutions concerning the acquisition of indicators, which are easy to monitor and concur to control the phenomenon in order to fight its acceleration. The constant but different combination that determines the diffusion of deserti- cation in the territories, attributable mostly to climatic changes and the activities of the man, makes our job challenging and complicated, since it varies from region to region. We are aware of all this and therefore we think that the methodological approach of survey of the data is an extremely important element to locate of the phenomenon and to monitor its course. This work, which is characterized for its multi-disciplinary approach, suggests solutions that we wish will quickly find concrete applications at international level. Prof. Bruno Dettori President CNLSD (Comitato Nazionale per la Lotta alla Siccità e alla Desertificazione) v
Geomorphic Hazards
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Author : Olav Slaymaker
language : en
Publisher: Chichester ; Toronto : Wiley
Release Date : 1996-06-12
Geomorphic Hazards written by Olav Slaymaker and has been published by Chichester ; Toronto : Wiley this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-06-12 with Nature categories.
This book examines geomorphic hazards, land form changes that adversely affect the geomorphic stability of a site or produces adverse socioeconomic impacts. These hazards include floods, landslides, seismicity, soil erosion and volcanic eruption.
The Geology Of Northwest Libya
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Author : Jamʻīyah al-Lībīyah li-ʻUlūm al-Arḍ
language : en
Publisher:
Release Date : 2003
The Geology Of Northwest Libya written by Jamʻīyah al-Lībīyah li-ʻUlūm al-Arḍ and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Geology categories.
The Maghreb Review
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Author :
language : en
Publisher:
Release Date : 1992
The Maghreb Review written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Africa, North categories.
Interg O Bulletin
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Author :
language : fr
Publisher:
Release Date : 1993
Interg O Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Cartography categories.
Couvrir Le Monde
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Author : Marie-Claire Robic
language : fr
Publisher: ADPF
Release Date : 2006
Couvrir Le Monde written by Marie-Claire Robic and has been published by ADPF this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Geography categories.
Couvrir le monde, traiter des lieux et des relations qu'individus et sociétés entretiennent avec une Terre qui apparaît comme finie -continents, pôles et mers étant désormais explorés -, voilà une ambition que les géographes entretiennent depuis la fin du XIXe siècle en se distinguant à la fois des savants et des autres professionnels, écrivains, journalistes, documentaristes, qui pourraient avoir la même visée. La géographie traitait voici un siècle de l'homme et de la Terre, de l'homme et du milieu, aujourd'hui, elle débat du Système-Monde, de l'espace géographique, de l'articulation des réseaux, des lieux et des territoires. Traiter d'un grand XXe siècle de géographie française, des années 1890 au début des années 2000, revient à rendre compte des dimensions historiques d'une discipline qui s'affirme sur cette durée comme un savoir spéculatif au sein de l'Université ou de la recherche fondamentale, mais qui se pose, de manière plus ou moins récurrente, les questions de son identité intellectuelle et de sa pertinence sociale.
Agro Bioclimatic Classification Of Africa
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Author : Henri Noël Le Houérou
language : en
Publisher:
Release Date : 1993
Agro Bioclimatic Classification Of Africa written by Henri Noël Le Houérou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Africa categories.