DOI: 10.1016/j.watres.2018.10.032
Scopus记录号: 2-s2.0-85055272288
论文题名: Impoundment intensity determines temporal patterns of hydrological fluctuation, carbon cycling and algal succession in a dammed lake of Southwest China
作者: Wang J. ; Chen G. ; Kang W. ; Hu K. ; Wang L.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 148 起始页码: 162
结束页码: 175
语种: 英语
英文关键词: Algae
; Carbon burial
; Lake impoundment
; Paleolimnology
; Water level fluctuation
Scopus关键词: Algae
; Ecology
; Lakes
; Paleolimnology
; Surficial sediments
; Surveys
; Water levels
; Carbon and nitrogen
; Community dissimilarities
; Ecological impacts
; Hydrological controls
; Limnological change
; Organic carbon fluxes
; Sediment core analysis
; Water-level fluctuation
; Organic carbon
; carbon
; nitrogen
; organic carbon
; water
; accumulation rate
; carbon cycle
; carbon flux
; dam construction
; diatom
; diatomite
; ecological impact
; grain size
; hydrological change
; impoundment
; intertidal environment
; lacustrine environment
; organic carbon
; paleolimnology
; sediment core
; species richness
; succession
; surficial sediment
; temporal analysis
; water depth
; water level
; water storage
; algal community
; Article
; bioaccumulation
; carbon cycling
; China
; climate
; dam (barrier)
; degradation
; diatom
; hydrology
; impoundment intensity
; investigative procedures
; lake
; lake sediment
; littoral
; nonhuman
; nutrient cycling
; paleolimnology
; particle size
; principal component analysis
; quantitative analysis
; sea surface waters
; sedimentation rate
; signal processing
; spatiotemporal analysis
; species richness
; storage
; water and water related phenomena
; water depth
; water level fluctuation
; water supply
; China
; algae
; Bacillariophyta
英文摘要: Hydrological control of lakes has been increasingly practiced in many parts of the world, however, the long-term ecological impact of hydrological regulation and their dependence on lake impoundment intensity has been rarely examined. We combined a spatial survey of surface sediments with sediment core analyses to quantify the limnological changes over the last two centuries for an oligo-mesotrophic lake, which was dammed in 1957 and reinforced during 1987–1990, respectively. A water depth inference model constructed from surface sediment clay components was applied to a well-dated sediment core for water level reconstruction. The inferred water depth increased from 6.2 ± 0.9 m to 8.7 ± 1.7 m after dam construction and further to 13.6 ± 2.6 m after dam enforcement, resulting in an increase in the magnitude of water level fluctuation (WLF). Accordingly, bulk sediment C/N ratio and median grain size spiked in ∼1957 and ∼1990, respectively, reflecting a large input of terrestrial sources due to impoundment. With a consistent loss of littoral zone and benthic diatoms over time, a significant decrease in C/N ratio and an abrupt depletion of carbon isotopic signal suggested a shift of carbon transfer towards a pelagic pathway after ∼1990. While there was a significant increase in algal production since ∼1990, the accumulation rate of carbon and nitrogen burial displayed an accelerating drop since ∼1957, reflecting a diluting effect derived from expanding water storage. Furthermore, there was a significant increase in both the ratio between inorganic and organic carbon fluxes and sediment burial of inorganic carbon, reflecting enhanced degradation and low storage of aquatic organic carbon in stratified deep waters since ∼1990. Hydro-morphological variables were found to exert strong impact on diatom communities, with an increasing interplay with nutrient and climate variables over time. While there existed a significant shift of diatom composition in ∼1960, species richness and community dissimilarity showed a significant decrease when water depth was raised to above ∼10 m or the magnitude of WFL was above ∼2 m. Thus, our sediment surveys provide evidence on the significant impact of lake regulation on hydro-morphology, carbon burial and ecological shift over time, as well as its stronger interaction with other forcing with increased impoundment intensity. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122218
Appears in Collections: 气候变化事实与影响
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作者单位: Yunnan Key Laboratory of Plateau Geographical Processes and Environment Change, School of Tourism and Geography, Yunnan Normal University, Kunming, China; Department of Biological Sciences, North Dakota State University, Fargo, United States
Recommended Citation:
Wang J.,Chen G.,Kang W.,et al. Impoundment intensity determines temporal patterns of hydrological fluctuation, carbon cycling and algal succession in a dammed lake of Southwest China[J]. Water Research,2019-01-01,148