Organic carbon sequestration in sediments of subtropical Florida lakes


Autoři: Matthew N. Waters aff001;  William F. Kenney aff002;  Mark Brenner aff002;  Benjamin C. Webster aff001
Působiště autorů: Department of Crop, Soil and Environmental Sciences, Auburn University, Auburn, Alabama, United States of America aff001;  Land Use and Environmental Change Institute, University of Florida, Gainesville, Florida, United States of America aff002;  Department of Geological Sciences, University of Florida, Gainesville, Florida, United States of America aff003
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226273

Souhrn

Recent studies have shown that sediments of temperate and tropical lakes are sinks for organic carbon (OC), but little is known about OC burial in subtropical lakes. There are questions regarding the ability of subtropical lakes to store OC, given their relatively warmwater temperatures, lack of ice cover, frequent water-column mixing, and labile carbon forms. We used 210Pb-dated sediment cores from 11 shallow Florida (USA) lakes to estimate OC burial, i.e. net OC storage, over the last ~100 years. Shallow Florida water bodies average ~30% OC content in their sediments and displayed rates of net OC accumulation (63–177 g C m-2 a-1) that are similar to natural temperate lakes, but lower than temperate agricultural impoundments. We considered the influence of lake morphometry on OC storage in our study lakes, but did not observe an inverse relationship between lake size and OC burial rate, as has been seen in some temperate lake districts. We did, however, find an inverse relation between mean water depth and OC sequestration. Despite recent cultural eutrophication and the associated shift from macrophyte to phytoplankton dominance in the Florida study lakes, overall OC burial rate increased relative to historic (pre-1950 AD) values. Lakes cover >9000 km2 of the Florida landscape, suggesting that OC burial in sediments amounts to as much as 1.6 Mt a-1. The high rate of OC burial in Florida lake sediments indicates that subtropical lakes are important for carbon sequestration and should be included in models of global carbon cycling.

Klíčová slova:

Carbon sequestration – Ecosystems – Eutrophication – Florida – Lakes – Sediment – Silver – Surface water


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