中文摘要：

通过室内静置培养模拟试验,研究了高浓度沼液淹灌稻田土壤后上覆水和土壤中氮、磷和有机物的动态变化特征。结果表明,全沼液淹灌处理的上覆水中总磷和NH＋4-N浓度分别在30 d和50 d内降低到允许排放标准以下;降低灌溉沼液的浓度,可缩短排放达标所需时间;但硝态氮浓度经过迅速下降后又会显著升高,全沼液灌溉处理100 d后,上覆水中NO-3-N的浓度比灌溉初期提高了44.9%。灌溉沼液中污染物浓度的降低,主要是降解和挥发作用的结果,只有少部分留在土壤中。因此,在水田休闲期进行高浓度的沼液淹灌,不仅可以消解和净化沼液中污染物质,还能有效改善土壤养分性质,不会引起土壤中氮、磷和有机物质的过量积累。

英文摘要：

Through indoor-static-culture simulation experiment,we studied the dynamics of nitrogen,phosphorus and organic matter in the overlying water and the paddy soil during the flooding of high concentration biogas slurry from livestock wastewater.Results showed that the concentrations of TP and NH＋4-N in overlying water for the total biogas slurry irrigation treatment were decreased to below the allowable discharge standards in 30 days and 50 days,respectively.With the reducing of the concentration of biogas slurry irrigation,the time to meet the standards for the overlying water would be shortened.However,the concentrations of NO-3-N in overlying water increased significantly after a complex process of denitrification and nitrification,and the concentration of NO-3-N in the treatment of total biogas slurry irrigation increased by 44.9% after 100 days of slurry flooding.The decontamination in overlying water is mainly resulted from pollutant degradation and volatilization,and it is with only a small part remaining in the soil.Thus,in fallow period,biogas slurry irrigation in paddy field would not only digest and purify the high concentration of nitrogen,phosphorus and organic mater in the slurry,but also improve the soil nutrients properties without the risks for excessive accumulation of nitrogen,phosphorus and organic matter in paddy soil.