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dryflux II
Globally, numerous lakes, reservoirs, and streams are subject to temporary drying. The emission of CO2 from these dry freshwater systems represent a so far overlooked process in the global carbon cycle. Habitats with exposed sediments include ponds and ephemeral rivers as well as shallow sediments of lakes and the drawdown area of reservoirs with large water level fluctuations. Even though declining water levels are often followed by the establishment of terrestrial vegetation, research has so far focused on unvegetated, exposed sediments. Yet the establishment of vegetation may off-set the CO2 losses caused by soil CO2 emissions. In dryflux II we aim to understand the role of terrestrial vegetation growing on dry aquatic systems on carbon cycling and CO2 emissions on a global scale.Contributing partners perform measurements using a closed chamber approach and analyse organic matter content of soil and plants. The coordinated measurements at several sites shall answer the following questions:
- How does terrestrial primary production modulate local dry flux estimates?
- How prevalent is terrestrial primary production on sediments of dry inland waters?
- How is the effect of terrestrial primary production on dry fluxes affected by environmental conditions at local or regional scales?
- What are the ultimate impacts on organic and inorganic carbon in sediments of dry inland waters?
This material is based upon work supported by the National Science Foundation under Grant Number DBI RCN 0639229 and MSB 1702991, 1137327, 1137353. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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