Department of Marine Sciences and Convergent Technology, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan-si, Gyeonggi-do, 15588, South Korea.
Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, 21990, South Korea.
Environ Pollut. 2018 Sep;240:105-115. doi: 10.1016/j.envpol.2018.04.098. Epub 2018 May 4.
We investigate historical environmental changes in an artificial lake, Lake Shihwa in South Korea, based on bulk (TOC, TN, C/N ratio, δC, and δN) and molecular (concentrations and δC of n-alkanes) parameters, by analyzing riverbank sediments (n = 12), lake surface sediments (n = 9), and lake core sediments (n = 108). Although the bulk organic parameters showed similar characteristics for all lake surface sediment samples, the distribution pattern and δC of n-alkanes revealed distinct differences between 2009 samples and 2012/2016 samples. This change of sedimentary organic matter characteristics can be attributed to operation of the tidal power plant that began in 2011, which improved lake water circulation and thus changed the lake sedimentary environment from anoxic to more oxic conditions. The vertical profiles of bulk and molecular lake sediment core records collected in 2009, especially at the site closest to the dike, showed a drastic shift around 1987, indicating that stronger anoxic sedimentary conditions prevailed after 1987. This is linked to sea dike construction in 1987, which prohibited sea-lake water exchange and thus deteriorated water quality in Lake Shihwa. We conclude that Lake Shihwa has experienced severe environmental changes due to human activities.
我们基于批量（TOC、TN、C/N 比、δC 和 δN）和分子（正构烷烃浓度和 δC）参数，通过分析河岸沉积物（n=12）、湖表沉积物（n=9）和湖芯沉积物（n=108），研究了韩国始华湖的历史环境变化。尽管所有湖表沉积物样品的批量有机参数都表现出相似的特征，但正构烷烃的分布模式和 δC 显示出 2009 年样品和 2012/2016 年样品之间的明显差异。这种沉积物有机质特征的变化可归因于 2011 年开始运行的潮汐能发电厂，该发电厂改善了湖水循环，从而使湖泊沉积环境从缺氧条件转变为更富氧条件。2009 年采集的批量和分子湖芯记录的垂直剖面，特别是在最靠近堤坝的地点，在 1987 年左右发生了急剧转变，表明 1987 年后存在更强的缺氧沉积条件。这与 1987 年修建海堤有关，海堤的修建阻止了陆海交换，从而恶化了始华湖的水质。我们得出结论，由于人类活动，始华湖经历了严重的环境变化。
