Dry-season greening of Amazon forests

Dry-season greening of Amazon forests

Evidence from ecological studies, eddy flux towers, and satellites shows that many tropical forests ‘green up’ during higher sunlight annual dry seasons, suggesting they are more limited by light than water. Morton et al.reported that satellite-observed dry-season green up in Amazon forests is an artefact of seasonal variations in sun- sensor geometry.

However, here these researchers argue that even after artefact correction, data from Morton et al. show statistically significant increases in canopy greenness during the dry season. Integrating corrected satellite with ground observations indicates that dry-season forest greening is prevalent in Amazonia, probably reflecting large-scale seasonal upregulation of photosynthesis by canopy leaf dynamics.

[adapted from source]

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