Can bodies of water with many submerged aquatic plants capture CO2 from the atmosphere?
Bodies of water containing many submerged aquatic plants might be hotspots for carbon (and nutrient) storage, particularly in the sediment. Management geared towards maintaining or restoring these aquatic plants can, in fact, contribute to achieving the objectives of the Paris Climate Agreement. In a mesocosm experiment with spiked water milfoil, we found that a four-degree higher water temperature resulted in a larger plant biomass and increased sedimentation. The decomposition of this plant material, however, was greater. The net result was that the storage of carbon, nitrogen and phosphorous in the bottom of the water remained high. These results suggest that bodies of water with submerged aquatic plants that are blooming can capture a portion of the anthropogenic emissions regardless of the water temperature.
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