长江流域资源与环境 >> 2016, Vol. 25 >> Issue (05): 830-836.doi: 10.11870/cjlyzyyhj201605017
李国莲, 谢发之, 张瑾, 陈广洲, 汪静柔
LI Guo-lian, XIE Fa-zhi, ZHANG Jin, CHEN Guang-zhou, WANG Jing-rou
摘要: 磷是导致巢湖水体富营养化的主要营养物质。采集大量巢湖表层水和沉积物样品,通过检测上覆水和沉积物中总磷含量,分析巢湖水体中磷的时空变化及赋存特征。结果显示:巢湖南淝河和裕溪河河口的上覆水中总磷含量值时间变化特征为8月 > 5月 > 3月 > 12月;且南淝河口总磷含量年均值超过地表水Ⅴ类水质标准,明显高于裕溪河口值;表层水和沉积物中总磷含量在空间分布上呈西高东低趋势,最高值均出现在靠近合肥市河口处。巢湖周边土壤及湖区磷的等值线分布表明:杭埠河流域农业污染、东巢湖东南部水土流失可能是巢湖磷面源污染的主要来源。巢湖上覆水和沉积物中总磷的相关系数为0.515,蓝藻爆发期全湖表层沉积物中总磷含量显著减少,揭示目前内源磷释放已是巢湖富营养化的主要因素。结果将对巢湖流域的污染综合防治及蓝藻治理工作提供科学依据。
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