Inferior adaptation of bay sediments in a eutrophic shallow lake to winter season for organic matter decomposition. (December 2016)

• Record Type: Journal Article
• Authors: Song, Na; He, Yu-Hong; Jiang, He-Long
• Is Part Of: Environmental pollution. Volume 219(2016)
• Page Start: 794
• Page End: 803
• Publication Date: 2016-12
• Subjects: Degradation -- Sediment -- Macrophyte litter -- Spatial heterogeneity -- Season; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2016.07.057
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Sediments in lake bays receive the greatest external pollutants mainly including terrestrial plants and river macrophyte detritus. This work investigated response and adaptation of bay sediments to organic matter (OM) decomposition under cold and hot seasons. After three month and incubated at 5 °C, it was found that the total organic carbon (TOC) removal efficiencies ranged from 15.4 to 13.1% in bay sediments to 22.6–25.7% in pelagic zone. These results determined that poorer OM decomposition occurred in the bay zone during the winter months compared to pelagic zone in a eutrophic shallow lake. High-throughput sequencing and network interactions revealed that the reactions were mainly due to the changing microbial community structure and species interaction at selected areas during different seasons. The bay zone communities are poorly adapted to utilizing the more recalcitrant carbon pool than the pelagic communities. Also, even though more taxa reside in bay communities, less co-occurrences interaction between taxa occurs, which mean that less inter taxa competition for the same resource. In consideration of our study, the potential harm, such as the terrestrialization process speeding up and water quality worsening will be happened, we need to exploit ways to enhance litter biodegradation in the bay zone in winter. Graphical abstract: Highlights: The degradation performance of macrophytes litter in bay zone and pelagic zone under winter and summer was compared. The bay sediments in a eutrophic shallow lake during winter had inferior adaptation for organic matter decomposition. The bay zone communities are poorer adapted to utilizing the more recalcitrant carbon pool than the pelagic communities. The bay zone communities had less inter taxa competition for the same resource (e.g. food or living space). Enhancing litter biodegradation in the bay zone in winter should be given attention. Abstract : Poorer microbial adaptivity and less interaction between species leads to inferior degradation ability of macrophyte litter in bay zone during winter.