香溪河库湾春季水华期间硝酸盐、磷酸盐的时空分布
THE SPATIAL AND TEMPORAL DISTRIBUTION OF NITRATE AND PHOSPHATE IN THE XIANGXI BAY, THREE GORGE RESERVOIR REGION DURING THE SPRING BLOOM PERIOD
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摘要: 在三峡水库香溪河库湾春季水华连续暴发期间(2005年2月26日—4月28日)对香溪河与长江汇合处(河口)至香溪河库湾上游库尾处总计14个采样点进行连续监测,结果表明硝酸盐和磷酸盐在库湾中存在明显的时空分布规律。在空间上,河口的硝酸盐浓度高,库尾浓度低,其变化趋势是随着与河口距离的增加而降低;磷酸盐的分布规律是库尾的浓度高,河口的浓度低,其变化趋势与硝酸盐恰好相反。各采样点硝酸盐和磷酸盐浓度在时间上也呈现出明显的规律。河口硝酸盐的浓度在不同时间变化幅度较小,库尾采样点的硝酸盐浓度的变化幅度较大,随着与河口距离的增加硝酸盐浓度在不同时间的变化幅度逐渐增大。各样点磷酸盐在时间上的变化趋势是样点S04-S08的变化幅度较大,位于香溪河库湾河口和库尾的变化幅度较小。Abstract: Field survey was carried out at 14 sites along the Xiangxi Bay,which had been the former Xiangxi River prior to theconstruction of Three2Gorge Reservoir,during a spring phytoplankton bloom (2,Feb.228,Apr.,2005). The sampling sites distributed from the mouth of Xiangxi River (where adjacent to the Yangtze River) to the head of the Xiangxi Bay.And field surveywas performed every six days,and the water was sampled and preserved with pH <2 using H2SO4. The concentrations of nitrateand phosphate of the water sample were analyzed by the Segmented Flow Analyzers (Skalar,Netherlands) using the standardmethods. The results showed a legible representation for the spatial and temporal distribution of the nitrate and phosphate. In thespatial,the concentration of nitrate was high in the mouth of the Xiangxi River and low in the head water of the Xiangxi Bay.Andthe concentration of nitrate was decreased with the distance increased from the mouth of the Xiangxi River. The spatial pattern ofphosphate was reverse to the nitrate. The concentration of the phosphate was low in the mouth of the Xiangxi River and high in thehead water of the Xiangxi Bay. The concentration of the phosphate was increased with the distance increased fromthe mouth of theXiangxi River. The spatial distribution of nitrate and phosphate may indicated that nitrate diffusion from the Yangtze River andphosphate diffusion from the head water of the Xiangxi Bay were the main factor driving the spatial pattern of nitrate and phosphate in the Xiangxi Bay. In the temporal,the variation of the concentration of nitrate in the sites near the mouth of the XiangxiRiver was small,and the variation in the head water of Xiangxi Bay was large.With the distance from the mouth of Xiangxi Riverincreased,the variation of nitrate was increased.A large variation of the concentration of phosphate was found in the middle reachof Xiangxi Bay (S04-S08).
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Keywords:
- Nitrate /
- Phosphate /
- N/ P Ratio /
- Eutrophication /
- Xiangxi Bay /
- Three Gorge Reservoir Region
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