Des indicateurs d'évolution du milieu et des sols pour rendre durable l'usage des savanes d'Amérique du Sud (notice n° 767589)
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| fixed length control field | 03497cam a2200373 4500500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20250123104536.0 |
| 041 ## - LANGUAGE CODE | |
| Language code of text/sound track or separate title | fre |
| 042 ## - AUTHENTICATION CODE | |
| Authentication code | dc |
| 100 10 - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Brossard, Michel |
| Relator term | author |
| 245 00 - TITLE STATEMENT | |
| Title | Des indicateurs d'évolution du milieu et des sols pour rendre durable l'usage des savanes d'Amérique du Sud |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Date of publication, distribution, etc. | 2005.<br/> |
| 500 ## - GENERAL NOTE | |
| General note | 16 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | Jusqu’au milieu du siècle passé, les savanes d’Amérique du Sud ont été relativement peu concernées par l’activité agricole et sylvicole, étant un lieu d’élevage bovin extensif. Depuis, tant dans le Cerrado au Brésil que dans les Llanos de Colombie et du Venezuela, pâturages cultivés, céréales et légumineuses à grains se sont imposés sur de grandes surfaces. L’occupation des terres est également sylvicole avec l’introduction d’espèces exogènes. Ce développement de nouvelles activités a été possible avec des schémas de fertilisation inorganique importants. Après une revue comparative du mécanisme de colonisation agricole des Llanos et du Cerrado et de l’examen de quelques caractéristiques biogéochimiques des sols, nous montrons l’importance de la relation de ces milieux avec des enjeux environnementaux actuels et la nécessité de produire de nouveaux indicateurs pour l’usage des savanes. |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | Soil and environmental sustainability indicators for South America’s savannasSouth American savannas cover some 2.69 million sq km across Brazil, Colombia, Venezuela and Bolivia. On a world-wide scale they represent one of the most extensive land areas with agricultural potential for crop and forestry production. Besides, these vast stretches of land are also the main alternative for avoiding the extension of agriculture to fragile tropical areas of higher ecological risk, such as the tropical rain forests and hillsides. Over the past four decades introduced pastures consisting chiefly of African species, in particular from the genus Brachiaria and Andropogon, and cropland have replaced the natural vegetation having low nutrient requirement in the savannas (Llanos) of Colombia and Venezuela, as well as in the Cerrado (Brazil). Intensive reforestation schemes have also taken place with alien species such as Pinus and Eucalyptus for pulpwood and timber production. The introduction of African grassland species and annual and perennial crops were made possible through the use of intensive fertilization, particularly with inorganic amendments. Following a preliminary comparative review of the colonization process by agriculture in the Llanos and Cerrado and a survey of some soil biogeochemical features, we show the crucial relation between these environments and current environmental stakes and the need to generate new indicators for the use of savanna areas. |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | biogéochimie des sols |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Cerrado |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Brésil |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Colombie |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | savanes |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Llanos |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Venezuela |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | utilisation des terres |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Cerrado |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Colombia |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Llanos |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Venezuela |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | land use |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | Brazil |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | soil biogeochemical cycle |
| 690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN) | |
| Topical term or geographic name as entry element | savanna |
| 700 10 - ADDED ENTRY--PERSONAL NAME | |
| Personal name | López-Hernández, Danilo |
| Relator term | author |
| 786 0# - DATA SOURCE ENTRY | |
| Note | Natures Sciences Sociétés | 13 | 3 | 2005-09-01 | p. 266-278 | 1240-1307 |
| 856 41 - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="https://shs.cairn.info/revue-natures-sciences-societes-2005-3-page-266?lang=fr&redirect-ssocas=7080">https://shs.cairn.info/revue-natures-sciences-societes-2005-3-page-266?lang=fr&redirect-ssocas=7080</a> |
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