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尽管国内外对养殖污水处理已提出了一系列的工艺技术,但因经济原因养殖污水直接灌溉农田在我国农村地区仍较为常见.为了解长期畜禽养殖污水直灌对稻田土壤质量的影响,在浙江省绍兴市柯桥区选择了养殖污水直灌不同年限(0、4、7、13年)的稻田,比较研究了养殖污水直接灌溉对稻田土壤不同深度土层中各形态氮和磷含量的影响,探讨了长期养殖污水灌溉对氮、磷在土壤剖面中垂直迁移的影响.结果表明:长期养殖污水直接灌溉可显著提高稻田土壤中氮和磷的积累,积累量随灌溉年限的增长而增加,其中磷素的增幅高于氮素.养殖污水灌溉4、7和13年后,土壤表层中全P和全N分别比对照增加了43.6%、95.2%、148.4%和7.7%、17.0%、28.4%.土壤氮素的变化为NH4+-N、NO3--N>酸解有机氮>非酸解有机氮;土壤有效磷的变化明显大于全磷.长期养殖污水灌溉可促进氮、磷在土壤剖面中的垂直迁移,增加对地下水的污染风险.
Although a series of process technologies have been proposed for domestic and international wastewater treatment, it is still common for rural areas to directly irrigate farmland due to economic reasons.In order to understand the effect of long-term livestock and poultry breeding wastewater on paddy soil quality, In the area of Keqiao District, Shaoxing City, Zhejiang Province, paddy field of direct seeding irrigation of different years (0, 4, 7 and 13 years) was selected. The effects of direct seeding irrigation on the contents of nitrogen and phosphorus in different depth soil layers of paddy soil , The effects of long-term culture wastewater irrigation on the vertical migration of nitrogen and phosphorus in the soil profiles were discussed.The results showed that direct irrigation with long-term culture wastewater could significantly increase the accumulation of nitrogen and phosphorus in paddy soil, and the accumulation increased with the increase of irrigation years , And phosphorus increased more than nitrogen after 4, 7 and 13 years of irrigation, soil total P and total N increased by 43.6%, 95.2%, 148.4% and 7.7%, 17.0% 28.4% .The change of soil nitrogen was NH4 + -N, NO3 - N> acidolysis of organic nitrogen> non-acidolysis of organic nitrogen.The change of soil available P was obviously greater than that of total P. Long-term culture sewage irrigation could promote nitrogen and phosphorus in soil Section Vertical migration, increasing the risk of contamination of groundwater.