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Nutrients and organic matter in the surface sediment of a submerged macrophyte zone in a eutrophic lake: Implications for lake management

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International Journal of Sediment Research 2022年第3期37卷 307-316页

作者： Jiancai Deng Xin Lu Weiping Hu Zhihong Xu State Key Laboratory of lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Institute of Agricultural Resources and Environment Jiangsu Academy of Agricultural Sciences Environmental Futures Research Institute Griffith University

Little is known about the distribution and risk levels of nutrients and organic matter(OM) in the surface sediment of shallow submerged macrophyte-dominated lakes. In the current study, sixty surface sediment samples were collected from Xukou Bay, a typical submerged macrophyte-dominated zone in lake Taihu, China. A 60-day degradation experiment of Potamogeton malaianus, a dominant species in the bay,was done in the laboratory. The results demonstrated that the ranges of total nitrogen(TN) and total phosphorus(TP), alkali-hydrolyzable nitrogen(AN), available phosphorus(AP), and OM in the surface sediment of the bay were 262.2-2,979.6 mg/kg, 41.2-728.7 mg/kg, 8.6-150.0 mg/kg, 4.4-36.4 mg/kg,and 3.7-50.2 g/kg, respectively. The spatial distributions of TN, OM, and AN concentrations showed similar trends: The highest concentrations were present in the northeastern and southwestern zones,while the TP and AP concentrations were high in the northeastern, central, and southwestern zones. The heterogeneity in the spatial distribution of nutrients and OM in the surface sediment of the bay was associated with aquatic vegetation and anthropogenic activities. The comprehensive risk index and organic nitrogen index revealed that the surface sediment was moderately, interactively contaminated by TN and TP and by organic nitrogen. TN and OM in the northeastern zone were mainly derived from endogenous residues due to the decomposition of aquatic plants, while TN in the southwestern zone was primarily derived from agricultural wastewater. Consequently, targeted measures should be implemented to reduce TN and OM in the surface sediment of macrophyte-dominated lakes.

关键词： Total nitrogen Total phosphorus Surface sediment Submerged macrophyte-dominated zone eutrophic lake

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Effect of phosphorus fluctuation caused by river water dilution in eutrophic lake on competition between blue-green alga Microcystis aeruginosa and diatom Cyclotella sp.

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Journal of Environmental Sciences 2010年第11期22卷 1666-1673页

作者： Yoshimasa Amano Yusuke Sakai Takumi Sekiya Kimitaka Takeya Kazuo Taki Motoi Machida Graduate School of Engineering Chiba University Safety and Health Organization Chiba University Faculty of Engineering Chiba Institute of Technology

Tega-numa （lake Tega） is one of the eutrophic lakes in Japan. For the improvement of water quality in lake Tega, the North- chiba Water Conveyance Channel was constructed in 2000, which transfer water from Tone River into the lake. After 2000, the dominant species of diatoms, mainly Cyclotella sp., have been replacing blue-green algae, mainly Microcystis aeruginosa in lake Tega. This transition of dominant species would be due to the dilution, but the detail mechanism has not been understood yet. This study examined the relationship between phosphorus fluctuation caused by river water dilution to lake Tega and dominance of algal species, M. aeruginosa or Cyclotella sp. based on the single-species and the mixed-species culture experiments. The single-species culture experiment showed that the half-saturation constant and uptake rate of phosphorus were one order lower and seven times higher for M. aeruginosa than those for Cyclotella sp. These findings implied that M. aeruginosa would possess a potential for the growth and survival over Cyclotella sp. in the phosphorus limited condition. The superiority of M. aeruginosa was reflected in the outcome of the mixed-species culture experiment, i.e., dominance of M. aeruginosa, even phosphorus concentration was lowered to 0.01 mg-P/L. Therefore, it could be concluded that the decrease in phosphorus concentration due to the river water dilution to lake Tega would be interpreted as a minor factor for the transition of dominant species from M. aeruginosa to Cyclotella sp.

关键词： eutrophic lake water quality improvement water blooms Microcystis aeruginosa Cyclotella sp.

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Linkage between water soluble organic matter and bacterial community in sediment from a shallow, eutrophic lake, lake Chaohu, China

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Journal of Environmental Sciences 2020年第12期32卷 39-46页

作者： Changming Yang Jiliang Sun Yingying Chen Jing Wu Yulai Wang Key Laboratory of Yangtze River Water Environment of the Ministry of Education Tongji UniversityShanghai 200092China Shanghai BaoSen Environmental Technology Co. Ltd.Shanghai 200439China School of Energy and Environment Anhui University of TechnologyMaanshan City 243002China

Lacustrine sediment played important roles in migration and transformation of its water soluble organic matter(WSOM), and the source and composition of WSOM would affect water trophic status and the fate of pollutants. However, we know little about the pathway of WSOM transformation and its driving bacterial communities in lacustrine sediment. In the present study, we investigated the spatial distribution patterns of sediment WSOM and its fluorescent fractions across lake Chaohu using fluorescence spectroscopy, and explored WSOM compositional structure through our proposed calculated ratios. In addition, we also analyzed sediment bacterial community using Illumina sequencing technology, and probed the possible pathway of sediment WSOM transformation under the mediate of indigenous bacteria. Our results showed that the inflowing rivers affected the spatial distribution patterns of WSOM and its five fractions(including tyrosine-, tryptophan-, fulvic acid-, humic acid-like substances and soluble microbial productions), and sediment WSOM originated from fresh algae detritus or bacterial sources. In parallel, we also found that Proteobacteria(mainly γ-Proteobacteria and δ-Proteobacteria), Firmicutes(mainly Bacilli), Chloroflexi, Acidobacteria, Planctomycetes and Actinobacteria dominate sediment bacterial community. Furthermore, these dominant bacteria triggered sediment WSOM transformation, specifically, the humic acid-like substances could be converted into fulvic acid-like substances, and further degraded into aromatic protein-like and SMP substances. In addition, our proposed ratios(P-L:H-L, Ar-P:SMP and H-L ratio), as supplementary tool, were effective to reveal WSOM composition structure. These results figured out possible pathway of WSOM transformation, and revealed its microbial mechanism in lacustrine sediment.

关键词： eutrophic lake DOM transformation Bacterial community EEMs-FRI Illumina sequencing

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Stoichiometric flexibility regulates the co-metabolism effect during organic carbon mineralization in eutrophic lacustrine sediments

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Journal of Oceanology and Limnology 2022年第5期40卷 1974-1984页

作者： Jie MA Fei HE Xingcheng YAN Ruijie SHI Ming JI Bin XU Xiaodong WU Zhichun LI Xiaoguang XU Guoxiang WANG Nanjing Institute of Environment Sciences Ministry of Ecology and EnvironmentNanjing 210042China Sorbonne University ParisUMR 7619METISParis 75005France School of Environment Nanjing Normal UniversityNanjing 210023China College of Urban and Environmental Sciences Hubei Normal UniversityHuangshi 435002China School of Environment and Surveying Engineering Soochow UniversitySuzhou 234000China

Several studies have suggested the pivotal roles of eutrophic lakes in carbon(C)cycling at regional and global ***,how the co-metabolism effect on lake sediment organic carbon(OC)mineralization changes in response to integrated inputs of labile OC and nutrients is poorly *** knowledge gap hinders our ability to predict the carbon sequestration potential in eutrophic ***,a 45-day microcosm experiment was conducted to examine the dominant mechanisms that underpin the co-metabolism response to the inputs of labile C and nutrients in lacustrine *** indicate that the labile C addition caused a rapid increase in the positive co-metabolism effect during the initial stage of incubation,and the co-metabolism effect was positively correlated with the C input *** positive co-metabolism effect was consistently higher under high C input,which was 152%higher than that under low C *** higherβ-glucosidase activity after nutrient addition,which,in turn,promoted the OC mineralization in *** addition different impacts of nutrients on the co-metabolism effect under different C inputs were *** with the low nutrient treatments,the largest co-metabolism effect under high C with high nutrient treatment was observed by the end of the *** the high C treatment,the intensity of the co-metabolism effect(CE)under high nitrogen treatment was 1.88 times higher than that under low nitrogen ***,in the low C treatment,the amount of nitrogen had limited impact on co-metabolism *** study thus proved that the microorganisms obviously regulate sediment OC turnover via stoichiometric flexibility to maintain a balance between resources and microbial requirements,which is meaningful for evaluating the OC budget and lake eutrophication management in lacustrine sediments.

关键词： co-metabolism effect stoichiometric carbon cycling eutrophic lake decomposition organic carbon

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Local-scale patterns of genetic variation in coexisting floating-leaved Nymphoides peltata and submerged Myriophyllum spicatum in Donghu lake

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Journal of Oceanology and Limnology 2020年第6期38卷 1825-1834页

作者： CAO Qianjin HU Feiyang LIU Na Institute of Evolution and Ecology School of Life SciencesCentral China Normal UniversityWuhan 430079China

Coexisting floating-leaved and submerged plants experience similar environmental changes but may evolve different patterns of genetic *** compare local-scale genetic variation,we collected samples of floating-leaved Nymphoides peltata and submerged Myriophyllum spicatum coexisting in a disturbed urban lake in *** the subpopulation level,using microsatellites,*** had higher clonal diversity than *** had 28.4%multilocus genotypes(MLGs)shared between subpopulations,but *** had only one MLG shared between two adjacent *** displayed more genetic variation between subpopulations than within subpopulations,but the reverse was true for *** components and Bayesian cluster analyses showed that individuals from each subpopulation of *** tended to have relatively close genetic *** ***,individuals from each subpopulation were genetically scattered with those from other *** results imply that in unpredictable adverse environments *** may be less subjected to local-deme extinction than *** because of genetically diverse clones at the subpopulation *** characteristic means that following adverse events,*** may rapidly restore subpopulation distributions via recolonization and intense gene flow among subpopulations.

关键词： aquatic plants life forms microsatellites clonal diversity eutrophic lake

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Characteristics of dissolved organic matter in lakes with different eutrophic levels in southeastern Hubei Province,China

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Journal of Oceanology and Limnology 2021年第4期39卷 1256-1276页

作者： Weixiang REN Xiaodong WU Xuguang GE Guiying LIN Mengdie ZHOU Zijie LONG Xinhui YU Wei TIAN College of Urban and Environmental Sciences Hubei Normal UniversityHuangshi 435002China Huangshi Key Laboratory of Soil Pollution and Control Huangshi 435002China

Dissolved organic matter(DOM)plays a crucial role in both the carbon cycle and geochemical cycles of other nutrient elements,which is of importance to the management and protection of the aquatic *** achieve a more comprehensive understanding the characteristics of DOM in the Changjiang(Yangtze)River basin,water samples from four natural lakes(Xiandao,Baoan,Daye,and Qingshan)in southeastern Hubei Province in China with different eutrophication levels were collected and *** optical characteristics were analyzed using ultraviolet-visible spectrophotometry and excitation-emission matrix spectroscopy coupled with parallel factor *** results show that:(1)two humic-like components(C1 and C2)and two protein-like substances(C3 and C4)of DOM were identified in all waterbodies;(2)C3 originated primarily from the degradation of microalgae and contributed substantially to humic-like components during transformation.C4 was widely present in the Changjiang River basin and its formation was related to microbial activity,rather than algal blooms or *** by the water mixing,the protein-like components were more likely to be transformed by microorganism,whereas humic-like components were more easily to be photobleached;(3)the concentration of DOM and the fluorescence intensity of humic-like components gradually increased with rising lake eutrophication *** respect to protein-like components,only C3 showed changes along the eutrophication gradients;(4)DOM showed a high affinity with permanganate index(COD Mn)and chlorophyll a(chl a)while the relationship was variable with *** study helps us systematically understand the DOM characteristics,microbial activities,and pollutant transformation in the Changjiang River basin and provides reference to the ecological restoration of aquatic environments.

关键词： Hubei eutrophic lake dissolved organic matter(DOM) excitation-emission spectra parallel factor analysis

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