Forêts
Définition(s)
Définitions générales
| A forest is a large area of land dominated by trees. Hundreds of more precise definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing and ecological function. According to the widely used Food and Agriculture Organization definition, forests covered 4 billion hectares (9.9×109 acres) (15 million square miles) or approximately 30 percent of the world's land area in 2006. Forests are the dominant terrestrial ecosystem of Earth, and are distributed around the globe. Forests account for 75% of the gross primary production of the Earth's biosphere, and contain 80% of the Earth's plant biomass. Net primary production is estimated at 21.9 gigatonnes carbon per year for tropical forests, 8.1 for temperate forests, and 2.6 for boreal forests. Forests at different latitudes and elevations form distinctly different ecozones: boreal forests around the poles, tropical forests around the Equator, and temperate forests at the middle latitudes. Higher elevation areas tend to support forests similar to those at higher latitudes, and amount of precipitation also affects forest composition. Human society and forests influence each other in both positive and negative ways. Forests provide ecosystem services to humans and serve as tourist attractions. Forests can also affect people's health. Human activities, including harvesting forest resources, can negatively affect forest ecosystems. |
Source : http://dbpedia.org/resource/Forest
External references (Wikipedia)
Médias référencés
Objet de commun (14)
- Charte de développement durable des vallées béarnaises et de protection de l'ours (France, Haut Béarn,)
- Définir les communs selon Kamira Naït Sid (Algérie)
- El Gran Dragon, sur les communs de la forêt au Pérou (France, Pérou,, 01:41:00)
- Fiche Institut Patrimonial du Haut Bearn (France)
- From the Magna Carta of 1215 to P2P Production Today (Allemagne, 00:30:34)
- Institut Patrimonial du Haut Bearn (France, 00:18:02)
- Interview - Peter Linebaugh - The Magna Carta Manifesto (USA, 00:29:23)
- Les biens communs : comment (co)gérer ce qui est à tous?
- Les biens communs, modèle de gestion des ressources naturelles (France)
- Les graines de la liberté (00:30:00)
- Menaces sur la foret francaise (France, 00:52:00)
- Philippe Minard : La guerre des forêts et les communs (00:09:56)
- Seeing the Forest (USA, 00:31:14)
- Theory and Practice in the Management of Natural Commons (00:30:14)
Sources
Wikidata : Q4421
DBpedia EN : Forest
Autres langues (Wikipedia)
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