乌梁素海沉积物溶解性有机质荧光光谱特性

采用三维荧光光谱技术(3DEEM)研究了乌梁素海沉积物溶解性有机质的结构组成特征.结果表明,乌梁素海沉积物溶解性有机质出现了6种荧光峰,分别代表类蛋白荧光物质和类富里酸荧光物质,且不同湖区沉积物溶解性有机质结构组成具有一定差异性.乌梁素海沉积物DOM的荧光指数处于1.74~1.96之间,及其DOM来源具有陆源和内源的双重特性,其中陆源主要来自西部河套灌区农田退水输入,内源主要来自芦苇等大型挺水植物死亡腐烂分解.因此,控制河套灌区农田退水排入以及抑制芦苇等挺水植物大量生长是保护乌梁素海生态环境和控制其富营养化的有效措施.

Spectral characteristics of dissolved organic matter in the sediments of Wuliangsuhai Lake.

Three-dimensional excitation-emission matrix fluorescence spectra (3DEEM) was used to investigate the fluorescence properties of dissolved organic matter in the sediment from Wuliangsuhai Lake. Of all the samples analyzed, there existed 6 kinds of fluorophores, which represented protein-like fluorescence substance and classic fulvic acid respectively, and there was some different structure of dissolved organic matter in different lake regions. Fluorescence index was between 1.74~1.96, which indicate its dissolved organic matter was derived from both land-sourced materials and endogenous, and the former originated in a large number inputing waste water from the western Hetao irrigation farmland, the latter from to the decay of some large emergent aquatic plants, such as reed, etc. Therefore, controlling the discharge of Hetao irrigation farmland waste water and restraining the growth of some large emergent aquatic plants will be an effective measure for protecting ecological environment and controlling the speed of eutrophication of Wuliangsuhai Lake.