三峡水库蓄水期支流水体营养盐来源估算

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Abstract

Hydrogen-oxygen isotope and nutrients including nitrogen and phosphorus in the sediments and overlying water were monitored in the bay of the XiangXi River (XXB), the first tributary of the Three Gorges Reservoir(TGR), during the impoundment period. The measured data were used to analyze the distribution characteristics of hydrogen-oxygen isotopes and the nutrients during the impoundment period. A binary mixed linear model was utilized to determine the contribution ratio of the main stream of the Yangtze River (CJ River) to GuFuYuanTou (GFYT), the upstream of the river. The study results showed that the sediments simutaneously functioned as source releasing NH₄⁺-N (ammonia nitrogen), DTP (total dissolved phosphorus), and PO₄^3--P (phosphates), and as absorbent collecting NO₃^--N (nitrate nitrogen) during the entire impoundment period. The computed results of the contribution ratios indicated that most nitrogen in the sediment (especially for DTN (total dissolved nitrogen) and NO₃^--N) came from the main stream before the impoundment. After the impoundment, the contribution rate of GFYT increased significantly, with sampling points No. 3 and 4 as the most obvious. Among all the nutrients, most DTP were from GFYT before and after the impoundment and the main stream was the main source of PO₄^3--P before the impoundment. Therefore, while the water in the bay of the reservoir was largely dominated by the influx of the main stream during the impoundment period, the impact of GFYT is more significant than that of the main stream on the sediment-overlying water system.

Key words： Three Gorges Reservoir impoundment hydrogen and oxygen isotope sediment-overlying water system nitrogen and phosphorus nutrients

Received: 20 March 2018

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