沉积物中有机磷在pH和温度影响下的矿化机制

通过实验室模拟，采用Bowman-Cole有机磷分级修正体系研究了pH和温度对沉积物中有机磷矿化的影响机制.结果表明，pH为6.5、 7.5、 8.5时有机磷（TOP）占总磷（TP）比例分别介于31.71%～41.73%、30.85%～43.29%和27.25%～56.31%之间，碱性条件促进有机磷矿化，中性条件下矿化速率减缓.15℃、25℃和35℃的TOP/TP分别介于29.07%～46.62%、27.81%～46.62%和34.56%～46.62%，在30 d模拟期内，前10 d有机磷矿化随着温度上升而增加，后20 d呈相反趋势.在偏酸性和高温条件下，稳性有机磷（NOP）向中活性有机磷（MLOP）的转化，中活性有机磷（MLOP）向活性有机磷（LOP）的转化呈现同步性，LOP矿化分解很快，使其可能成为上覆水中藻类生长的磷源，潜在影响了富营养化进程.

Organic Phosphorus Mineralization in the Sediments Under the Impact of pH and Temperature

In the simulation, Bowman-Cole modified organic phosphorus fractionation system was used for the analysis of pH and temperature impact on organic phosphorus mineralization. The results showed that when pH were 6.5, 7.5 and 8.5, organic phosphorus (TOP) accounted for 31.71%-41.73%, 30.85%-43.29% and 27.25%-56.31% of total phosphorus (TP) in the sediments respectively. Alkalescent environment accelerated the process of organic phosphorus mineralization which slowed down when environment was neutral. When temperatures were 15 degrees C, 25 degrees C and 35 degrees C, TOP accounted for 29.07%-46. 62%, 27.81%-46.62% and 34.56%-46.62% of TP respectively. The process of organic phosphorus mineralization increased with temperature in the first 10 days but decreased in the following 20 days. Under acidic and high temperature environment, labile organic phosphorus (LOP) has a strong influence on the water quality because of the simultaneous processes of transformations from nonlabile organic phosphorus (NOP) to moderately labile organic phosphorus (MLOP) and from MLOP to LOP.