2024 Volume 47 Issue 6 Pages 183-191
The carbon and nitrogen contents in suspended particles in a euphotic layer shallower than 10 m and the carbon and nitrogen fluxes in settling particles in depths below the euphotic layer were measured in Lake Sagami from May to December 2016. Mass fluxes were more than 10 times higher than those previously reported in eutrophic lakes. The carbon and nitrogen fluxes were higher than those in the primary production in the euphotic layer and likely came from sources in addition to the euphotic layer. The factors that led to increased carbon and nitrogen fluxes were not necessarily related to rainfall. The carbon and nitrogen contents were lower in the settling particles than in the suspended particles and showed no clear seasonal variation. Furthermore, the C/N ratio in the settling particles was approximately 1.3 times higher than that in the suspended particles.
