Carbon, nitrogen, and sulfur isotope changes and hydro-geological processes in a saline lake chain
Carbon, nitrogen, and sulfur isotope changes and hydro-geological processes in a saline lake chain
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DOI：
10.1007/s10750-004-6418-2
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发表时间：
2004-11-01
期刊：
影响因子：
2.6
通讯作者：
Zuykova, E
中科院分区：
文献类型：
--
作者：
Doi, H;Kikuchi, E;Zuykova, E
在俄罗斯西伯利亚西部的chanany湖复合体中，水的离子浓度、电导率和pH值从河口到湖泊内部发生变化。这种差异表明西伯利亚西部干燥气候下封闭水体系统的湖水有明显的蒸发。颗粒有机物（POM，主要由浮游植物组成）的碳同位素组成随水体pH值变化明显，反映了溶解CO2的浓度。以湖泊沉积物为食的底栖无脊椎动物Chironomus plumosus幼虫的碳氮同位素特征随着POM和沉积物有机质（SOM）的增加而系统性地增加。POM和SOM的硫酸盐-硫和氮同位素组成随入海口进入chanany湖复合体的距离而增加。微生物硫酸盐还原和反硝化作用分别导致沉积物中硫和氮同位素的重循环，可能导致POM和SOM中硫酸盐-硫和氮同位素组成的增加。
The ionic concentrations, conductivity and pH of water in the Lake Chany complex in West Siberian Russia change from the mouth to the interior of the lake. This difference is indicative of marked evaporation of lake water from the closed water body system in the dry climate of Western Siberia. The carbon isotope composition of particulate organic matter (POM, composed mainly of phytoplankton) clearly changes, along with the pH of the water, reflecting the concentration of dissolved CO2. Carbon and nitrogen isotope signatures of Chironomus plumosus larvae, a benthic invertebrate that may feed on bulk lake sediment, systematically increase, along with those of POM and sediment organic matter (SOM), through the lake chain. Both sulfate-sulfur and nitrogen isotope compositions of the POM and SOM increase with distance from the estuary into the Lake Chany complex. Heavier sulfur and nitrogen isotope recycling from the sediment, caused by microbial sulfate reduction and denitrification, respectively, may have led to the increased sulfate-sulfur and nitrogen isotope compositions of the POM and SOM.