Sedimentation rate and early diagenesis of particulate organic nitrogen and carbon in Aydat Lake (Puy de Dôme, France)

Tracking long-term human impacts on landscape, vegetal biodiversity and water quality in the Lake Aydat catchment (Auvergne, France) using pollen, non-pollen palynomorphs and diatom assemblages

“…in the 774.5-660 cm depth interval). It suddenly increases to reach 0.52 cm yr − 1 from 660 cm depth up to the top, which is consistent with the rate of 0.46 cm yr −1 estimated by Sarazin et al (1992) for the last 50 years. When flood events are considered in the calculation the sedimentation rate reaches 0.6 cm yr −1 (Lavrieux et al, 2013a).…”

Putting the rise of the Inca Empire within a climatic and land management context

“…Although the degradation of organic matter during sedimentation and diagenesis can ultimately affect C/N ratios (e.g. Sarazin et al, 1992;Meyers et al, 1995), the changes are unlikely to result in shifts large enough to obscure the terrestrial/aquatic nature of the source material (Meyers and Teranes, 2001). …”

Sediment Organic Matter

“…In contrast, the C/N ratio of organic matter derived from algae can increase during sinking and early sedimentation as nitrogen-rich proteins are selectively degraded. This trend is sometimes observed in lakes having high productivity, such as eutrophic Aydat Lake in France, where a downcore increase in C/N values throughout the upper 40cm of sediment (Sarazin et al, 1992) indicates active microbial denitrification of organic matter.…”