【摘要】 应用SMT连续提取法分析滇池福保湾柱状沉积物的磷(P)形态,探讨P形态的垂向分布特征.沉积物中总磷(TP)含量高,最高达4 200 mg/kg,无机磷(IP)是TP的主要部分,占TP的52%-91%,铁/铝结合态磷(Fe/Al-P)是IP的主要部分,占IP的55%-94%.同一湖区不同采样点的沉积物P形态的垂向变化不同,湖湾北端近河口处和南端远离河口处的沉积物中Fe/Al-P,IP,有机磷(OP)和TP含量随深度增加而增加,6-11 cm层的含量最高,这与近年来入湖河流污染负荷削减和河堤阻隔导致P入湖量减少有关.河口处沉积物的钙结合态磷(Ca-P)含量随深度增加而增加,最南端沉积物的Ca-P含量随深度增加而减少.离河口较远的沉积物中,Fe/Al-P,IP,OP,TP和Ca-P均随深度增加而减少.各点沉积物P形态的变化受该点人类活动带来的入湖污染物量的影响较大,距河口最远处的沉积物中P形态随深度变化不如其他点明显.更多还原

【Abstract】 SMT continuous extracting method was used for the analysis of the phosphorus(P) forms of columnar sediments from Fubao Gulf,Dianchi Lake.The vertical distribution of P forms in sediments was then discussed.The sediment has high total phosphorus(TP) content,with maximum value of(4 200) mg/kg.inorganic phosphorus(IP) is the major part of TP,which is about 52%～91% of TP.P bound to Al,Fe and Mn oxides and hydroxides(Fe/Al-P) is the major part of IP,which is about 55%～94% of IP.The vertical distribution of P forms in the same lake area has various regularities.In the river mouth and the south endpoint of the gulf,the content of Fe/Al-P,IP,organic phosphorus(OP) and TP decreased as the depth of sediment increased.The content of Fe/Al-P,IP,OP and TP in these points was largest in the layer from 6 to 11 cm under the water/sediment interface.This maybe caused by the reduction of pollutants load entering the river and the partition of pollutants load entering the lake by the river levee.The P associated with Ca(Ca-P) content increased as the sediment depth increased in the river mouth area but decreased as the sediment depth increased in the south of the gulf.This illustrated that the change of P forms in sediment of every site was affected by the pollutants load entering the lake by the anthropogenic action.And the change of P forms in sediment of the southmost point in the gulf was less than other points.更多还原