巢湖湖滨带沉积物间隙水溶解性有机质的光谱特征与时空差异

doi:10.19741/j.issn.1673-4831.2020.0731

Abstract

Abstract: Three-dimensional fluorescence spectroscopy (3DEEM) and parallel factor analysis (PARAFAC) were used to study the composition, profile distribution characteristics and main sources of dissolved organic matter (DOM) in the interstitial water of sediments in the littoral zone of Lake Chaohu. The results show that DOM in interstitial water contained three fluorescent fractions, including humic-like fraction C1 (275 nm, 365 nm/467 nm), humic-like fraction C2 (330 nm/407 nm) and tyrosine-like fraction C3 (275 nm/319 nm). In terms of spatial pattern, the mean value of DOM fluorescence intensity in the pelagic zone was (0.432±0.306) RU, which was lower than the mean value of DOM fluorescence intensity in the near shore zone of (0.583±0.478) RU, while the mean value of fluorescence intensity in the near shore zone was greater than that in the center of the lake, and the fluorescence intensity showed a decreasing trend with depth in the vertical profile at each point. In terms of time pattern, the mean value of DOM fluorescence intensity in summer was (0.390 0±0.301) RU, less than that in winter[(0.584±0.453) RU];In addition, the DOC concentration in the nearshore zone was higher than that in the pelagic zone, the DOC concentration in the pelagic zone was higher than that in the lake center, and the DOC concentration in all sections in winter was higher than that in summer; The DOC concentration first increased, then decreased rapidly with the increase of sediment depth, and remained stable below 10 cm layer of sediment-water interface. The humification index (HIX) in winter was higher than that in summer, and the fluorescence index (FI) and biogenic index (BIX) indicated that DOM in interstitial water was influenced by both endogenous biogenic sources and terrestrial sources of exogenous pollution, and was more influenced by endogenous biogenic sources. This study can provide certain references for the water environment management and non-point source pollution control in the littoral zone of Lake Chaohu.

Key words: interstitial water, dissolved organic matter, lakeshore zone, spectral analysis, Lake Chaohu

CLC Number:

X524

YING Yan-jie, ZHAO Min, LI Yong, PAN Ji-zheng, ZHANG Guo-zheng, WANG Xin. Spectral Characteristics and Spatiotemporal Differences of Dissolved Organic Matter of Sediment Pore Interstitial Waters in the Littoral Zones of Lake Chaohu[J]. Journal of Ecology and Rural Environment, 2021, 37(7): 924-933.

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Spectral Characteristics and Spatiotemporal Differences of Dissolved Organic Matter of Sediment Pore Interstitial Waters in the Littoral Zones of Lake Chaohu

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