环境因子对沙土覆盖底泥抑制有机磷释放的影响

通过室内模拟试验,探究沙土覆盖后环境因子对底泥中有机磷(OP)释放与转化的影响。研究结果表明:河沙加红土的组合覆盖控制底泥OP释放的最佳应用环境条件为温度为25 ℃的好氧中性环境,该条件下的原位覆盖能增加底泥中OP含量,减少上覆水总磷(TP)的浓度。环境因子改变对底泥中的中等活性磷(MLOP)的转化影响最大,主要通过抑制底泥中MLOP转化,使底泥中OP含量和OP/TP比例增加。碱性磷酸酶活性(APA)与底泥中各形态磷含量的相关性研究表明,磷酸酶活性能反映底泥中OP的转化释放过程,APA与底泥中TP、OP含量呈正相关。

EFFECTS OF ENVIRONMENTAL FACTORS ON THE RELEASE OF ORGANIC PHOSPHORUS FROM SOIL COVERED SEDIMENTS

Through the indoor simulation experiments, the effect of environmental factors on the release and conversion of OP in the sediment was studied. The results were gained as follows: the combining capping of river sand and red soil was the best way to control the release of OP in sediment; under the aerobic environment with T=25 ℃, the combination of sand and red soil capping can effectively control the release of organic phosphorus into the overlying water, and the content of OP in sediment increased, reducing the concentration of TP and DOP in overlying water. The environmental factors had the considerable impact on the conversion of moderately active phosphorus (MLOP) in the sediment, and the content of organic phosphorus and the ratio of OP/TP increased from inhibiting the MLOP conversion in the sediment. The correlation between alkaline phosphatase activity (APA) and various forms of phosphorus in the sediment showed that APA was positively correlated with TP and OP content in sediment, and APA could indicate the conversion process between various forms of phosphorus.