藻类生长对滇池沉积物磷释放影响的研究

室内对滇池沉积物进行藻类生长模拟试验,结果表明,以沉积物作为唯一P源进行培养,滇池藻类依然可以正常生长;沉积物在藻类生长的影响下,具有较强的P释放潜力,释放速率可达19.2mg/(m2·d);藻类生长对P的大量需求,是通过OH-对沉积物Fe结合态P阴离子置换,和对金属离子Fe的有机蝥合以增加被结合态P的解吸两种主要途径获得的,藻吸收利用沉积物中P的形态主要为Fe结合态P。

EFFECT OF ALGAL GROWTH ON PHOSPHORUS RELEASE FROM SEDIMENT IN DIANCHI LAKE

Phosphorus release from sediments in Dianchi Lake with algal growing was simulated under lab conditions. The results showed that the algae from Dianchi Lake grew normally in the culture solution with the sediment as the only phosphorus source. The sediment had a high potential to release phosphorus under the influence of algal growth, with a max releasing rate of 19.2 mg/(m²·d). When algae was growing, it absorbed a large amount of phosphorus, mainly in two ways. One is to replace phosphate ion existing in a form of Fe-bounded phosphorus in the sediment with OH^-, and the other is to increase desorption of Fe-bounded phosphorus by organic complex chelating metal Fe ion. The form of phosphorus absorbed by algae from sediment was mainly Fe-bounded phosphorus.