【摘要】 研究了滇池福保湾沉积物中磷的地球化学形态及间隙水中PO43--P含量的垂向分布特征.福保湾沉积物磷形态空间差异大,河口区TP高达(5630.59±424.25)mg/kg,东西沿岸区TP只有200-300mg/kg,无机磷(I-P)是TP的主要部分,占TP的55%-74%,铁/铝结合态磷(Fe/Al-P)是I-P的主要组成部分,约占I-P的90%,不稳定性磷∞P)含量很低,只占TP含量的0.5%.福保湾沉积物具有极高的Fe/Al-P含量,说明湾内具有很高的内源磷负荷,这与福保湾水体严重富营养化和藻类暴发关系密切.湖湾沉积磷的垂向分布规律较复杂,但基本上是随深度增加而减小,说明福保湾周边区域近几年人类活动作用加强,褐保湾污染有加重的趋势.在湾内不同区域应用Peeper(渗吸膜式)技术,获得了间隙水中PO43--P的垂向分布特征,PO43--P浓度自上覆水向下层间隙水呈先升后降,反映它们有自间隙水向上覆水扩散的趋势.福保湾间隙水PO43--P浓度同沉积物L-P含量具有显著正相关性(α=0.05),但Fe/Al-P、Ca-P、org-P和TP含量未发现有明显的相关关系.更多还原

【Abstract】 This paper presents investigations on geochemical species of phosphorus in sediments and vertical distributions of PO43--P in interstitial waters of Fubao Bay in Lake Dianchi. The sediments of Fubao Bay had high TP contents, with the maximum value of (5630.59±424.25)mg/kg. I-P(inorganic phosphorus) was the major part of TP, which was about 55%-74%of TP. Fe/Al-P (P bound to Al, Fe and Mn oxides and hydroxides) was the major part of I-P, which was about 90% of I-P. The contents of L-P(labile phosphorus) were very low, which was about 0.5% of TP. The Fe/Al-P contents in sediments were very high, which were highly correlated with high eutrophication phenomenon and algae blooming events in Fubao Bay, implying a strong diffusion trend for sediment phosphorus in Fubao Bay. Vertical distributions of sediment phosphorus species were complicated, exhibiting a little disorder in both increased and decreased trends with the depth. This feature was related to the ecosystem conditions, pollutant discharge and sediment dynamic conditions in Fubao Bay. Peeper technique (in situ dialysis membrane samplers) was used to sample interstitial waters in sediments, and vertical distributions of PO43--P were achieved in the waters. The results showed that concentrations of PO43--P in interstitial waters had general increases followed by decreases with the depth, reflecting a possible diffusion trend for PO43--P from interstitial waters to overlying waters. Regression analyses showed that concentrations of PO43--P in the interstitial waters were positively correlated with L-P contents.更多还原