Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.scitotenv.2020.144868
Title (Primary) Dramatic temporal variations in methane levels in black bloom prone areas of a shallow eutrophic lake
Author Zhang, L.; Liu, C.; He, K.; Shen, Q.; Zhong, J.
Source Titel Science of the Total Environment
Year 2021
Department SEEFO
Volume 767
Page From art. 144868
Language englisch
Topic T5 Future Landscapes
Keywords Lake Taihu; Algal bloom; Hypoxia; Sediment; Dissolved oxygen
Abstract Global lakes serve as a key natural source of methane (CH4) and suffer from increasing hypoxia due to unprecedented anthropogenic activities and climate change. A black bloom is a temporary hypoxia triggered by a longstanding algal bloom, which facilitates CH4 production by creating reducing conditions and abundant algae-sourced organic carbon. One-year investigations were conducted to examine temporal CH4 dynamics in the water and sediment pore water in black bloom prone areas (BBPAs) in Lake Taihu, China, where there had been at least two recorded black bloom events. The CH4 in the water changed significantly with time (p < 0.001), with the highest concentrations appearing in warm months when an abnormal lower dissolved oxygen content was observed at different sites, which were one to two orders of magnitude higher than other months. Compared with the control site, there were significantly higher CH4 concentrations in BBPA waters (p < 0.001), which was consistent with the higher CH4 in the sediment pore water. Methane dynamics in the water showed significant positive correlations with temperature, total phosphorus, total nitrogen, ammonia-N, and soluble reactive phosphorus (p < 0.05), but showed a significant inverse correlation with dissolved oxygen (p < 0.01). Redundancy analysis indicated dissolved oxygen made the largest contribution to CH4 dynamics in the BBPAs. A significant increase in the CH4 in water will turn BBPAs into temporary hot spots with substantial CH4 emissions with the appearance of black blooms. The results provide new insights into understanding future CH4 dynamics under globally prevailing algal blooms and climate change.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=24132
Zhang, L., Liu, C., He, K., Shen, Q., Zhong, J. (2021):
Dramatic temporal variations in methane levels in black bloom prone areas of a shallow eutrophic lake
Sci. Total Environ. 767 , art. 144868 10.1016/j.scitotenv.2020.144868