articleGeophysical Research LettersMar 1, 2006BRONZE OA

Amazon rainforests green‐up with sunlight in dry season

AHAlfredo HueteKDKamel DidanYEYosio Edemir ShimabukuroPRP. RatanaSRS. R. Saleska

University of Arizona · Instituto Nacional de Pesquisas Espaciais · +4 more institutions

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Abstract

Metabolism and phenology of Amazon rainforests significantly influence global dynamics of climate, carbon and water, but remain poorly understood. We analyzed Amazon vegetation phenology at multiple scales with Moderate Resolution Imaging Spectroradiometer (MODIS) satellite measurements from 2000 to 2005. MODIS Enhanced Vegetation Index (EVI, an index of canopy photosynthetic capacity) increased by 25% with sunlight during the dry season across Amazon forests, opposite to ecosystem model predictions that water limitation should cause dry season declines in forest canopy photosynthesis. In contrast to intact forests, areas converted to pasture showed dry‐season declines in EVI‐derived photosynthetic capacity,…

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Topics & keywords

Topics
Keywords
  • Environmental science
  • Rainforest
  • Dry season
  • Moderate-resolution imaging spectroradiometer
  • Canopy
  • Amazon rainforest
  • Leaf area index
  • Eddy covariance
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