Very High Productivity of the C₄ Aquatic Grass Echinochloa polystachya in the Amazon Floodplain Confirmed by Net Ecosystem CO₂ Flux Measurements

Fluxes of CO₂ and H₂O vapour from dense stands of the C4 emergent macrophyte grass Echinochloa polystachya were measured by eddy covariance in both the low water (LW) and high water (HW, flooded) phases of the annual Amazon river cycle at Manaus, Brazil. Typical clear-sky midday CO₂ uptake rates by...

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