Department of Environment and Energy, Sejong University, Seoul, 143-747, South Korea.
Environ Monit Assess. 2011 Dec;183(1-4):425-36. doi: 10.1007/s10661-011-1930-0. Epub 2011 Mar 8.
In contrast to extensive studies of dissolved organic matters (DOM) in natural lakes, the distributions and the characteristics of DOM in artificial dam reservoirs have not been well documented despite a growing demand for the construction worldwide. For this study, spatial variations in the concentrations and the characteristics of DOM in Lake Paldang, a large river-type dam reservoir, were investigated using the concentrations, the specific UV absorbance (SUVA), the synchronous fluorescence spectra and the molecular weight (MW(w)) values. In addition, environmental factors determining the DOM spatial distribution were examined based on a principal component analysis (PCA). Variations in the DOM characteristics were greater than those for the concentrations (1.1-2.4 mg C/L). In contrast to typical lakes, vertical variations with a depth were much smaller than those observed among horizontal sampling sites within the reservoir. Irrespective of the depth, four individual sampling locations were easily distinguished by comparison of some selected DOM characteristics. The protein-like fluorescence (PLF), MW(w) and SUVA values observed at the location near the dam exceeded the corresponding values for the sampling locations near major influent rivers, suggesting that, even for the river-type dam reservoir, the downstream DOM characteristics may be governed by in-lake DOM production processes such as the release from sediments and algal activities. The results of principal component analysis (PCA) revealed that approximately 61% of the variance in DOM distribution might be explained by allochthonous/autochthonous carbon sources and predominant presence of either total nitrogen or total phosphorous over the other.
与天然湖泊中溶解有机质（DOM）的广泛研究相比，尽管全球对人工大坝水库的建设需求不断增长，但大坝水库中 DOM 的分布和特征尚未得到很好的记录。在这项研究中，使用浓度、特定紫外吸收（SUVA）、同步荧光光谱和分子量（MW(w)）值，研究了大型河流型大坝水库 Paldang 湖中 DOM 的浓度和特性的空间变化。此外，还根据主成分分析（PCA）检查了决定 DOM 空间分布的环境因素。DOM 特征的变化大于浓度的变化（1.1-2.4mgC/L）。与典型湖泊不同，垂直变化的幅度远小于水库内水平采样点之间的变化。无论深度如何，通过比较一些选定的 DOM 特征，很容易区分四个单独的采样位置。在大坝附近的位置观察到的类蛋白荧光（PLF）、MW(w)和 SUVA 值超过了主要入流河流附近采样位置的相应值，这表明，即使对于河流型大坝水库，下游 DOM 特征也可能受到湖泊内 DOM 产生过程的控制，如沉积物的释放和藻类活动。主成分分析（PCA）的结果表明，DOM 分布的大约 61%的方差可以通过异源/同源碳源来解释，并且总氮或总磷的存在占主导地位，而其他因素则相对较少。
