Advances in Land Cover/Use Changes for Biogeochemical and Hydrological Modeling Diógenes S. Alves Instituto Nacional de Pesquisas Espaciais 3rd LBA Conference Brasilia, 29 July 2004 D. Alves, 3rd LBA Conference

Rugendas A tentative summary of land cover/use changes for biogeochemistry and hydrology: 1. 1.Spatial concentration  Pasture-dominated landscapes 2. 2.Annuals in very large farms : soy beans, rice, mayse 3. 3.Secondary vegetation decline; pasture growth 4. 4.Crop decline (small farms); pasture growth 5. 5.Cattle growing faster than pastures

Alves 2002 I.J.R.S. Spatial concentration of forest clearing: Landscapes increasingly pasture-dominated D. Alves, 3rd LBA Conference

Alves et al 2003 I.J.R.S. Deforestation, abandonment and pasture- use intensification: effects of management D. Alves, 3rd LBA Conference

Distributions of cattle densities in Brazilian Amazon: /96 Higher cattle densities occurred more frequently in 1995/96 than in PASTURE INTENSIFICATION TREND D. Alves, 3rd LBA Conference Alves in prep.

Distributions of temporary crops in Brazilian Amazon: /96 Crops represented larger fractions of land use in 1985 than in 1995/96 – (almost) BASIN-WIDE RANCHING TREND D. Alves, 3rd LBA Conference Alves in prep.

Alves em prep. Crops inside and outside the “soy bean” pockets Soy beans represent large fractions of total land use Soy bean implies land rotation (young fallow or grass ?) D. Alves, 3rd LBA Conference

Summary What follows from pasture use intensification ? – What mid/large-scale biogeochemical and hydrological changes follow past use intensification ? – What will be the life cycle of pastures ? – How pasture use intensification is being achieved ? (effects on biogeochemistry, run off...) – What are the pathways outside OLD/NEW areas ? – What are landscape configurations (forest, crops, sec vegetation, grasses) in soy-bean producing areas ? – Biogeochemical and hydrological changes following agriculture intensification ?

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