North and Central America: ecological zones. Amérique du Nord et centrale: zones écologiques. Zonas ecológicas de América del Norte, Centro América y el Caribe. Global forest resources assessment 2000; main report. Evaluation des ressources forestieres mondiales 2000: rapport principal. Evaluación de los recursos forestales mundiales 2000: informe principal.
mag（2001）
Key words
habitat,desertification,plant ecology,technological changes,geomorphology,soil conservation,cell division,environmental degradation,temperate forests,plant communities,geology,plant anatomy,tropisms,steppe,vegetation,forests,plant habit,simbiosis,steppes,decentralization,resource depletion,resource management,ecosystems,social participation,plant physiology,seed,gramineae,environment,forage,land degradation,decentralisation,botany,growth,soil fertility,livestock,scrub,fauna,palaeontology,habitats,symbiosis,landscape,fire ecology,biodiversity
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