高原浅水湖泊沉积物中磷、氮形态化学研究

以滇池马村湾和海东湾为研究对象，对其沉积物－间隙水－上覆水三界面中的磷、氮形态作研究，其中钙结合态磷占的比例最大，其次是有机/细菌聚合态磷和残渣磷；总氮含量很高，平均值为2.63 mg/g，而亚硝酸盐氮含量很低，其它三种无机氮形态（硝酸盐氮、亚硝酸盐氮和氨氮）之间并不存在恒定的化学计量关系，这主要是无机氮循环还受水体和沉积物中有机氮的影响。调查还表明沉积物中Fe P含量与间隙水中溶解性磷酸盐磷有着较好的线性关系，沉积物中Fe P含量与间隙水Eh呈对数关系。

FORMS OF CHEMICALS NITROGEN AND PHOSPHORUS IN SEDIMENTS IN A SHALLOW, PLATEAU LAKE

The forms of nitrogen and phosphorus in the three interfaces of sediments, interstitial water and overlaying water were studied in the present study. The Ca P takes up the largest proportion in the total Phosphorus, followed by Org/Bact P and residual Phosphorus. The content of total Phosphorus was very high, with the average of 2.63mg/g, while the nitrite was very low and there was no relative chemic counterbalance among nitrate, nitrite and ammoniate, because the inorganic nitrogen circle was also affected by organic nitrogen in water and sediments. The results also showed that there was perfect linear relationship between Fe P in sediments and PO+{3-}-4-P in interstitial water, logarithmic relationship between Fe P in sediments and Eh of interstitial water. The average net inner load of Phosphorus in sediments of these two bays in Dianchi Lake was 4.25g·m+{-2}·a+{-1}, and the contents of phosphorus and nitrogen of the 0~5 cm sediments in these two bays were 148.3t、218.94t,respectively.