Sediment carbon short-term response to water carbon content change in a large floodplain-lake system
- 19 February 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in Environmental Science and Pollution Research
- Vol. 28 (24), 31497-31510
- https://doi.org/10.1007/s11356-021-13016-3
Abstract
After carbon (C) enters a lake through surface runoff and atmospheric deposition, most of it, being influenced by the environmental conditions of the basin, is deposited into lake sediment, thus, becoming one of the most important C pools in the world. Therefore, it is critical to understand sediment response characteristics under the context of increasing C concentrations in lake water. Based on the changes of sediment C concentration at different depths in Poyang Lake, belonging to China’s large floodplain-lake system, we revealed the sediment C short-term response characteristics to changes in lake water C concentrations as well as their associated impacting factors. We found that dissolved total carbon (DTC) concentrations increased by 25.78% in winter compared to spring, while total carbon (TC) sediment concentrations increased by only 4.37% during the corresponding period. Specifically, we found that there was a hysteresis effect in the response of sediment C to the increase of water C concentration in the short term. When DTC concentrations in water were below a threshold value (12.50 mg/L), sediment TC concentrations were generally maintained at approximately 5.79 mg/kg. We also believed that biological and environmental factors and sediment stratification characteristics collectively resulted in this sediment C hysteresis effect. Among these factors and characteristics, phytoplankton can affect sediment C response by changing C absorption and utilization in water or cause a synergistic effect along with environmental factors, which is the key link that causes this C sediment hysteresis effect to occur. Furthermore, we found that the combined effect of sediment C from different depths also resulted in a hysteresis effect in C deposition.Funding Information
- National Nature Science Foundation of China (41830860; 41871080)
This publication has 79 references indexed in Scilit:
- Consequences of a simulated rapid ocean acidification event for benthic ecosystem processes and functionsMarine Pollution Bulletin, 2013
- Lakes and reservoirs as regulators of carbon cycling and climateLimnology and Oceanography, 2009
- Organic carbon burial efficiency in lake sediments controlled by oxygen exposure time and sediment sourceLimnology and Oceanography, 2009
- Microbial activity in surficial sediments overlying acoustic wipeout zones at a Gulf of Mexico cold seepGeochemistry, Geophysics, Geosystems, 2008
- Sediment organic carbon burial in agriculturally eutrophic impoundments over the last centuryGlobal Biogeochemical Cycles, 2008
- Carbon cycling in large lakes of the world: A synthesis of production, burial, and lake‐atmosphere exchange estimatesGlobal Biogeochemical Cycles, 2007
- Plumbing the Global Carbon Cycle: Integrating Inland Waters into the Terrestrial Carbon BudgetEcosystems, 2007
- The global abundance and size distribution of lakes, ponds, and impoundmentsLimnology and Oceanography, 2006
- Role of lakes for organic carbon cycling in the boreal zoneGlobal Change Biology, 2003
- Evidence from chronosequence studies for a low carbon-storage potential of soilsNature, 1990