Trace elements influenced by environmental changes in Lake Biwa: (I) Seasonal variations under suboxic hypolimnion conditions during 2007 and 2009
作者： Yusuke Nakashima , Akiyoshi Shimizu , Masahiro Maruo , Yoshiki Sohrin
DOI: 10.1007/S10201-015-0474-3
关键词:
摘要: Dissolved oxygen (DO) in the Lake Biwa hypolimnion reached its lowest level of <1 mg kg−1 2007. In this paper, we report variations total dissolvable (TD), dissolved (D), and labile particulate (LP) fractions Al, Si, P, V, Cr, Mn, Fe, Ni, Cu, Zn, As, Mo, W, U 2007 2009. Al Fe species were predominantly form LP-Al LP-Fe strongly correlated with one another (r = 0.99), suggesting that weathering aluminous minerals supply clay mineral particles are main factors influence distributions Fe. Although D-Al increased summer epilimnion, D-Fe was relatively low, probably as a result uptake by plants. Reductive release from bottom not seen. Mn also dominated LP-Mn, but fraction showed different distribution to those LP-Fe. The D-Mn LP-Mn concentrations varied 700–1000 marked increases water during stratification We believe Mn2+ released sediments oxidized DO water. which exist cationic species, had LP/TD ratios 0.1–0.7 uniform distributions. U, oxoacid 0–0.8. As characterized nutrient-like profiles, maxima Mo distribution. TD-Mo along TD-Mn, while TD-V TD-W significant decreases. These results likely attributable differences adsorption these elements onto manganese oxides iron hydroxides.
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