| Autor: |
Wen-Zhang, Li, Li, Zhang, Sheng-Rui, Wang, Shang-Bin, Xiao, Wei-Bin, Qian, Yin, Xi, Ke-Chen, Xu, Ling-Long, Shi |
| Rok vydání: |
2018 |
| Zdroj: |
Huan jing ke xue= Huanjing kexue. 38(7) |
| ISSN: |
0250-3301 |
| Popis: |
The 47 samples from Erhai Lake surface sediments were collected in different seasons. The distribution and structure characteristics of sediment water extractable organic nitrogen(WEON) were investigated by using the combined techniques of UV-Vis absorption and three-dimensional excitation-emission matrix spectra(3DEEMs). The differences in DON of various sources(overlying water, pore water, inflow Rivers and wet deposition) were explored to analyze its effects on sediment. The results showed that:1the temporal distribution followed the pattern of summerspringautumnwinter, with the spatial WEON distribution of northernsoutherncentral. 2 The humic degree of Erhai sediment WEON was relatively high and mostly composed of fulvic acid, which mainly contained UV-like humic-like fluorescence peak A and high-excited tryptophan fluorescence peak B. This indicated that it was mainly affected by terrestrial input and microbial activity. 3 There were two fluorescent components(C1, C2) in the sediments and other sources of Erhai Lake. The component C1 was the endogenous visible ultraviolet peak formed by biodegradation, while the component C2 was the tryptophan peak. The bioavailability of wet deposition samples was comparatively high, greatly impacting Erhai Lake in heavy rainfall. The DON bioavailability in the inflow river was the lowest, which was prone to be accumulated in sediments. 4The DON component C1 and C2 in overlying water had significant negative correlation with Erhai sediment WEON contents( |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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