Belle, Simon
- University of Franche-Comté
Abstract
Lakes play a key role in the regulation of the global carbon cycle. However, their functioning can be strongly impacted by anthropogenic pressures and climate variability. Understanding the response of the carbon cycle to environmental changes remains a crucial, elusive goal for both ecosystem managers and aquatic ecologists. In particular, the relations among lake physical and chemical properties, landscape structure and lake carbon cycling must be studied to predict future trends in lake functioning. Sediment cores were collected from the deepest part of 14 small French lakes that differed in lake properties (elevation, conductivity, area, area of the watershed) and land-use class (forest, wetland, agricultural land and urban area). The sampling strategy employed the top-bottom approach (a comparison between present-day conditions and reference' conditions at Medieval period, c. AD 1000). For each sample, the following variables were analysed: isotopic carbon composition of sedimentary organic carbon (C-13(OM)), C-13 of chironomid remains (C-13(HC)), and sedimentary pigments (total carotenoids, TC). Stepwise multiple regression analysis showed that the size of the catchment area may affect C-13(OM) values for the Medieval samples (R-2=0.36, P
Keywords
biogenic methane; carbon cycle; global change; lake; palaeolimnology
Published in
Freshwater Biology
2016, volume: 61, number: 7, pages: 1105-1118
Publisher: WILEY-BLACKWELL
SLU Authors
UKÄ Subject classification
Ecology
Publication identifier
- DOI: https://doi.org/10.1111/fwb.12771
Permanent link to this page (URI)
https://res.slu.se/id/publ/84617