Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba 305-8567, Japan.
Mar Environ Res. 2011 May;71(4):247-56. doi: 10.1016/j.marenvres.2011.01.009. Epub 2011 Feb 4.
This study determined the factors contributing to the spatial distribution of 14 metal concentrations in the surface sediments of Beppu Bay on the basis of comparisons of the organic geochemical properties and environmental parameters through principal component analysis (PCA) and redundancy analysis (RDA). The results of PCA and RDA showed that the concentrations of V, Cr, Co, and As were closely related to the distances between the sampling sites and the Oita River. This indicated that these metals originated from the river's drainage area. The Mn, Cu, Mo, and Cd concentrations were related to the water depth. These results indicated that the Mo, Cd, and Cu deposition processes were controlled by oxygen depletion, and that these elements accumulated in the deeper parts of the bay under anoxic conditions.
本研究通过主成分分析（PCA）和冗余分析（RDA）对比较有机地球化学性质和环境参数，确定了贝普湾表层沉积物中 14 种金属浓度空间分布的影响因素。PCA 和 RDA 的结果表明，V、Cr、Co 和 As 的浓度与采样点之间的距离和大分川密切相关。这表明这些金属来源于河流的流域。Mn、Cu、Mo 和 Cd 的浓度与水深有关。这些结果表明，Mo、Cd 和 Cu 的沉积过程受缺氧的控制，这些元素在缺氧条件下在海湾的较深部位积累。
