湿地沉积物中无机磷的形态特征及主要影响因子研究

Speciation Characteristics and Main Influencing Factors of Inorganic Phosphorus in Wetland Sediments

摘要: 对黄河三角洲退化滨海湿地沉积物中磷形态含量特征及温度、pH、上覆水理化性质对湿地沉积物磷形态含量的影响进行了研究。结果表明，退化滨海湿地沉积物中不同形态磷中铁结合磷(Fe-P)含量最高，最大值达到971.7 mg/kg，闭蓄态磷(O-P)含量最小，最小值为260.1 mg/kg。Fe-P、Al-P、Ca-P、O-P平均含量分别683.7、400.9、331.6、287.9 mg/kg。当温度<20℃时，Fe-P含量随温度升高而增大，温度>20℃时，Fe-P含量随温度升高而下降；Al-P含量随温度升高逐渐增大，O-P含量随温度的升高先下降后增大。Fe-P含量随着pH的增大逐渐降低，pH > 9时对Fe-P含量的影响不大；Al-P和Ca-P含量均随pH的升高先下降后增大。

Abstract: The characteristics of phosphorus forms in sediments of degraded coastal wetlands in the Yellow River Delta and the effects of temperature, pH, physical and chemical properties of overlying water on phosphorus forms in sediments were studied. The results showed that the content of iron bound phosphorus (Fe-P) in different forms of phosphorus was the highest, and the maximum of Fe-P content was 971.7 mg/kg. The content of closed form phosphorus (O-P) was the lowest, and the minimum of O-P content was 260.1 mg/kg. The average contents of Fe-P, Al-P, Ca-P and O-P were 683.7, 400.9, 331.6 and 287.9 mg/kg, respectively. The content of Fe-P increases with the increase of temperature when the temperature is less than 20˚C. The content of Fe-P decreases with the increase of temperature when the temperature is more than 20˚C. The content of Al-P increases with the increase of temperature, and the content of O-P decreased and then increased with the increase of temperature. The content of Fe-P decreased gradually with the increasing of pH, and had little ef-fect on the content of Fe-P when pH > 9. The content of Al-P and Ca-P decreased and then increased with the increase of pH.