DOI: 10.1016/j.watres.2017.12.051
Scopus记录号: 2-s2.0-85039779393
论文题名: Optical properties and composition changes in chromophoric dissolved organic matter along trophic gradients: Implications for monitoring and assessing lake eutrophication
作者: Zhang Y. ; Zhou Y. ; Shi K. ; Qin B. ; Yao X. ; Zhang Y.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 131 起始页码: 255
结束页码: 263
语种: 英语
英文关键词: Chlorophyll a
; Chromophoric dissolved organic matter
; Total nitrogen
; Total phosphorus
; Trophic state index
Scopus关键词: Biogeochemistry
; Biological materials
; Carbon
; Chlorophyll
; Dissolution
; Estimation
; Eutrophication
; Lakes
; Nitrogen
; Organic compounds
; Phosphorus
; Remote sensing
; Chlorophyll a
; Chromophoric dissolved organic matter
; Total nitrogen
; Total phosphorus
; Trophic state
; Optical properties
; chlorophyll a
; dissolved organic matter
; nitrogen
; phosphorus
; absorption coefficient
; aquatic environment
; carbon cycle
; chemical composition
; chlorophyll a
; concentration (composition)
; dissolved organic matter
; eutrophication
; in situ measurement
; index method
; lacustrine environment
; lake
; light attenuation
; nitrogen cycle
; optical property
; phosphorus
; phosphorus cycle
; remote sensing
; threshold
; trophic level
; trophic status
; trophic structure
; absorption
; absorption spectrophotometry
; Article
; China
; correlation analysis
; environmental monitoring
; eutrophication
; lake
; molecular size
; nutrient concentration
; parameters
; priority journal
; Secchi disk depth
; trophic level
; water quality
; water sampling
; China
英文摘要: Chromophoric dissolved organic matter (CDOM) is an important optically active substance in aquatic environments and plays a key role in light attenuation and in the carbon, nitrogen and phosphorus biogeochemical cycles. Although the optical properties, abundance, sources, cycles, compositions and remote sensing estimations of CDOM have been widely reported in different aquatic environments, little is known about the optical properties and composition changes in CDOM along trophic gradients. Therefore, we collected 821 samples from 22 lakes along a trophic gradient (oligotrophic to eutrophic) in China from 2004 to 2015 and determined the CDOM spectral absorption and nutrient concentrations. The total nitrogen (TN), total phosphorus (TP), and chlorophyll a (Chla) concentrations and the Secchi disk depth (SDD) ranged from 0.02 to 24.75 mg/L, 0.002–3.471 mg/L, 0.03–882.66 μg/L, and 0.05–17.30 m, respectively. The trophic state index (TSI) ranged from 1.55 to 98.91 and covered different trophic states, from oligotrophic to hyper-eutrophic. The CDOM absorption coefficient at 254 nm (a(254)) ranged from 1.68 to 92.65 m-1. Additionally, the CDOM sources and composition parameters, including the spectral slope and relative molecular size value, exhibited a substantial variability from the oligotrophic level to other trophic levels. The natural logarithm value of the CDOM absorption, lna(254), is highly linearly correlated with the TSI (r2 = 0.92, p <.001, n = 821). Oligotrophic lakes are distinguished by a(254)<4 m−1, and mesotrophic and eutrophic lakes are classified as 4 ≤ a(254)≤10 and a(254)>10 m−1, respectively. The results suggested that the CDOM absorption coefficient a(254) might be a more sensitive single indicator of the trophic state than TN, TP, Chla and SDD. Therefore, we proposed a CDOM absorption coefficient and determined the threshold for defining the trophic state of a lake. Several advantages of measuring and estimating CDOM, including rapid experimental measurements, potential in situ optical sensor measurements and large-spatial-scale remote sensing estimations, make it superior to traditional TSI techniques for the rapid monitoring and assessment of lake trophic states. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113005
Appears in Collections: 气候减缓与适应
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作者单位: Taihu Lake Laboratory Ecosystem Research Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China; University of Chinese Academy of Sciences, Beijing, China; Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China
Recommended Citation:
Zhang Y.,Zhou Y.,Shi K.,et al. Optical properties and composition changes in chromophoric dissolved organic matter along trophic gradients: Implications for monitoring and assessing lake eutrophication[J]. Water Research,2018-01-01,131