杭州西湖沉积物磷分析及释放风险
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摘要
本研究以杭州西湖的茅家埠、小南湖以及乌龟潭等3个子湖中的沉积物为研究对象,研究其中沉积物磷赋存形态,通过对沉积物磷吸附指数(phosphorus sorption index, PSI)与磷吸附饱和度(phosphorus saturation, DPS)进行测定与计算并根据两者对西湖沉积物磷的释放风险进行了客观评估.对沉积物风险分析表明:杭州西湖沉积物呈还原态,表现出强氧化性;沉水植物的生长会对沉积物的氧化还原电位产生影响,沉水植物盖度越大,沉积物氧化还原电位越高,氧化性越强;沉积物磷污染状况严重,沉积物中磷的吸附容量主要与其中活性铁铝氧化物的含量有关;杭州西湖不同区域的沉积物磷的吸附指数有较大的不同,主要与区域的生态化逆境相关;受各种相关因素影响,杭州西湖沉积物磷的释放处于中度偏轻的风险状态.
The phosphorus(P) forms of sediments in three sub-lakes of West Lake, Hangzhou, China: Maojiabu, Xiaonanhu and Wuguitan were investigated, and the P release risk of the sediments was evaluated through the P sorption index(PSI) and degree of P saturation(DPS). The results showed that the sediment in West Lake mainly exists in the reduced state. The growth of submerged plants affected the redox potential of sediments, which was raised with the increase of submerged plants coverage, and the sediments oxidizability was increased. The concentration of P in the sediment was mainly related to the content of active iron-aluminum oxides. The adsorption index of P in different areas of West Lake is different, mainly related to the ecological adversity. We concluded that the release of P in sediments of the three sub-lakes in West Lake was at a moderate risk after considering the various related factors.
The phosphorus(P) forms of sediments in three sub-lakes of West Lake, Hangzhou, China: Maojiabu, Xiaonanhu and Wuguitan were investigated, and the P release risk of the sediments was evaluated through the P sorption index(PSI) and degree of P saturation(DPS). The results showed that the sediment in West Lake mainly exists in the reduced state. The growth of submerged plants affected the redox potential of sediments, which was raised with the increase of submerged plants coverage, and the sediments oxidizability was increased. The concentration of P in the sediment was mainly related to the content of active iron-aluminum oxides. The adsorption index of P in different areas of West Lake is different, mainly related to the ecological adversity. We concluded that the release of P in sediments of the three sub-lakes in West Lake was at a moderate risk after considering the various related factors.
引文
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