Zhang Min, Xu Yao-Yang, Shao Mei-Ling, Cai Qing-Hua
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
Ying Yong Sheng Tai Xue Bao. 2009 Nov;20(11):2799-805.
The spatiotemporal distribution of total nitrogen (TN) and total phosphorus (TP) in sediments of Xiangxi Bay, Three Gorges Reservoir was investigated from October 2004 to July 2006, with related affecting factors analyzed. The TN and TP concentrations in the sediments were higher in the middle stretch but lower in the two edges of the Bay. The maximum value of TN concentration (1.08 mg x g(-1)) appeared in the middle part of the Bay, and the minimum (0.89 mg x g(-1)) occurred at the adjacent areas to the river mouth; while the maximum value of TP concentration (1.07 mg x g(-1)) appeared in the middle, and the minimum (0.80 mg x g(-1)) was in the edges of the Bay. The TN concentration decreased in the sequence of autumn-winter-spring, but increased from spring to summer dramatically; while the seasonal variation of TP concentration was not very significant, with the maximum occurred in spring. Significant inter-annual variations were observed in the TN and TP concentrations. The spatial distributions of TN and TP concentrations were mainly affected by the sedimentation of suspended matter. In the regions where sedimentation rate was high, the TN and TP concentrations were also very high. The seasonal fluctuation of TN concentration was mainly affected by river discharge, while that of TP concentration was mainly affected by point source pollution.
2004年10月至2006年7月，对三峡水库香溪河库湾沉积物中总氮（TN）和总磷（TP）的时空分布进行了调查，并分析了相关影响因素。库湾中部沉积物中TN和TP浓度较高，两侧较低。TN浓度最大值（1.08 mg x g(-1)）出现在库湾中部，最小值（0.89 mg x g(-1)）出现在河口附近区域；TP浓度最大值（1.07 mg x g(-1)）出现在中部，最小值（0.80 mg x g(-1)）出现在库湾边缘。TN浓度按秋冬春顺序降低，但从春季到夏季急剧增加；TP浓度的季节变化不太显著，最大值出现在春季。TN和TP浓度存在显著的年际变化。TN和TP浓度的空间分布主要受悬浮物沉降的影响。在沉降速率高的区域，TN和TP浓度也很高。TN浓度的季节波动主要受河流流量影响，而TP浓度的季节波动主要受点源污染影响。
