岩溶区水库冬季溶解有机质组成特征及来源:以桂林五里峡水库为例
发布时间：2019-07-01 13:36
【摘要】：近年来,三维荧光技术被广泛应用于研究天然水体中溶解有机质(DOM)的物理化学特性.为了解岩溶区水库水体溶解有机质的特征,利用三维荧光光谱并结合平行因子分析法研究桂林五里峡水库冬季水体中DOM分布特征及其来源,探讨其水化学特征以及初步估算DOM荧光组分的相对比例.结果表明,五里峡水库水体中的Ca~(2+)、HCO_3~-为主要阳阴离子,水体水化学主要受碳酸盐风化作用影响,DOC质量浓度占TOC质量浓度的91%;五里峡水库水体DOM在冬季主要由类富里酸、类腐殖酸和类色氨酸组成;荧光指数、腐殖化指标、自生源指标和新鲜度指数显示五里峡水库水体DOM在冬季整体呈现弱腐殖质化特征,自生源特征明显,微型光合生物对水体中DOM的形成起到至关重要的作用,说明水生微型生物的光合作用在岩溶碳循环中扮演着重要的角色.
[Abstract]:In recent years, three-dimensional fluorescence technique has been widely used to study the physicochemical properties of dissolved organic matter (DOM) in natural water. In order to understand the characteristics of dissolved organic matter in reservoir water body in Karst area, the distribution characteristics and sources of DOM in winter water of Wulixia Reservoir in Guilin were studied by using three-dimensional fluorescence spectrum and parallel factor analysis method, and the hydrochemical characteristics and the relative proportion of DOM fluorescence components were preliminarily estimated. The results show that Ca~ (2) and HCO_3~- are the main anions in the water body of Wulixia Reservoir, and the hydrochemistry of the water body is mainly affected by carbonate weathering, the mass concentration of DOC accounts for 91% of the mass concentration of TOC, and the DOM of Wulixia Reservoir is mainly composed of fulvic acid, humic acid and tryptophan in winter. Fluorescence index, humification index, autosource index and freshness index show that the water body DOM of Wulixia Reservoir shows weak humus characteristics as a whole in winter, and the characteristics of authigenic sources are obvious. Microphotosynthetic organisms play an important role in the formation of DOM in water, indicating that photosynthesis of aquatic microorganisms plays an important role in Karst carbon cycle.
【作者单位】： 西南大学地理科学学院岩溶环境重庆市重点实验室;中国地质科学院岩溶地质研究所/国土资源部广西岩溶动力学重点实验室;桂林理工大学环境科学与工程学院;
【基金】：国家自然科学基金项目(41641026,41361054) 广西自然科学基金项目(2015GXNSFGA139010,2014GXNSFCA118012) 中国地质科学院项目(YYWF201505) 中国地质调查局项目(DD20160305-05)
【分类号】：X143
本文编号：2508522
[Abstract]:In recent years, three-dimensional fluorescence technique has been widely used to study the physicochemical properties of dissolved organic matter (DOM) in natural water. In order to understand the characteristics of dissolved organic matter in reservoir water body in Karst area, the distribution characteristics and sources of DOM in winter water of Wulixia Reservoir in Guilin were studied by using three-dimensional fluorescence spectrum and parallel factor analysis method, and the hydrochemical characteristics and the relative proportion of DOM fluorescence components were preliminarily estimated. The results show that Ca~ (2) and HCO_3~- are the main anions in the water body of Wulixia Reservoir, and the hydrochemistry of the water body is mainly affected by carbonate weathering, the mass concentration of DOC accounts for 91% of the mass concentration of TOC, and the DOM of Wulixia Reservoir is mainly composed of fulvic acid, humic acid and tryptophan in winter. Fluorescence index, humification index, autosource index and freshness index show that the water body DOM of Wulixia Reservoir shows weak humus characteristics as a whole in winter, and the characteristics of authigenic sources are obvious. Microphotosynthetic organisms play an important role in the formation of DOM in water, indicating that photosynthesis of aquatic microorganisms plays an important role in Karst carbon cycle.
【作者单位】： 西南大学地理科学学院岩溶环境重庆市重点实验室;中国地质科学院岩溶地质研究所/国土资源部广西岩溶动力学重点实验室;桂林理工大学环境科学与工程学院;
【基金】：国家自然科学基金项目(41641026,41361054) 广西自然科学基金项目(2015GXNSFGA139010,2014GXNSFCA118012) 中国地质科学院项目(YYWF201505) 中国地质调查局项目(DD20160305-05)
【分类号】：X143
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