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CHANGES IN CERRADO LAND USE Carlos A Klink University of Brasilia, Brazil
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RR AP AM PA AC RO MT TO MA CE RN PB PE AL SE PI BA GO DF MG ES RJ SP MS PR SC RS Atlantic Forest Caatinga AmazoniaAmazonia Pantanal Grassland BiomesBiomes CerradoCerrado
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CERRADO SAVANNAS: 2,000,000 Km2 ( 25% of contiguous USA) 10,000 Plant Species One of the World’s 25 “hotspots”
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RAINFALL SEASONALITY FIRE SUBSTRATE HUMAN ACTION Most biomass is underground DETERMINANTS CERRADO IS A TROPICAL SAVANNA
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LANDSAT IMAGE OF BRASILIA AND NATIONAL PARK
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Planted Pastures Cash Crops Bare Soil
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Cerrado Savanna Amazon Forest CONSEQUENCES: RATE OF CHANGE
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Woody SavannaNatural Grassland ET: 2.8-4.8 mm/d 8m ET: 1.2-1.8 mm/d 4m PAW WET: 721 mm DRY: 229 mm 70% of total water used in DRY season comes from below 2 m WET: 402 mm DRY: 71 mm MODELLING Planted Pastures: 10% reduction PP 9% reduction ET Dry spells during growth season 50% of total water used in DRY ALTERATION OF WATER CYCLE
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Planted Pastures African grasses Pasture Degradation New Planted Pastures FIRE Biological Invasion African Grasses modify water cycle, fire regime & reduce biodiversity Carbon Imbalances Large C Stock & Sink Becomes Source when Degraded ECOLOGICAL FEEDBACKS
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ECONOMICAL FEEDBACK REGIONAL SCALE
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ECONOMICAL FEEDBACK GLOBAL SCALE “AGRONEGÓCIOS: O BRASIL QUE ASSUSTA BUSH” ( Primeira Leitura, April/2002) Production Costs (US$/ha)
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NEW ECOSYSTEMS (“Emerging Ecosystems”) that have been formed brought both positive (economical) and negative (environmental) effects; KNOWLEDGE: Economical benefits are well documented, while Environmental impacts are poorly understood; THIS IMBALANCE POSES GREAT DIFFICULTIES TO INFLUENCE LAND- USE & CONSERVATION POLICIES BACK TO THE FUTURE
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