Abstract

The regional features of transformation in the chemical composition of water in the Lower Volga tributaries and its main trends under anthropogenic impact and climatic variations are presented. Most trends for the principle ions (sulfates, carbonates, calcium and magnesium ions) are increasing, which may be a consequence of ongoing climate change. Moderate decreasing trends prevail in the concentrations of nutrients and organic substances in water. It was found that the trends in metal concentrations are multidirectional. All revealed statistically significant trends for iron and copper compounds are decreasing, and those for manganese are increasing. Based on the analysis of the identified trends in the chemical composition, the river ecosystems of the Lower Volga tributaries are classified into two categories: stable (“healthy”) and transformed (“transitioning”).

中文翻译：

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人为影响和气候变化下伏尔加河下游支流水化学成分和水质变化趋势

摘要

介绍了伏尔加河下游支流水化学成分变化的区域特征及其在人为影响和气候变化下的主要趋势。主要离子（硫酸盐、碳酸盐、钙和镁离子）的大多数趋势正在增加，这可能是持续气候变化的结果。水中营养物质和有机物质的浓度呈适度下降趋势。发现金属浓度的趋势是多向的。所有显示的铁和铜化合物的统计显着趋势都在下降，而锰的趋势正在增加。根据对已确定的化学成分趋势的分析，伏尔加河下游支流的河流生态系统分为两类：