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为研究造纸废水灌溉对黄河三角洲芦苇湿地土壤主要活性氮组分的影响,以低盐分和高盐分芦苇湿地为研究对象,设置废水不同灌溉次数的随机区组试验,分析微生物生物量氮(Microbial biomass nitrogen,MBN)、硝态氮(NO3--N)、铵态氮(NH4+-N)、溶解性有机氮(Dissolved organic nitrogen,DON)的变化。结果表明:与对照相比,废水灌溉并不能提高土壤MBN,但废水灌溉1~3次处理明显提高高盐分芦苇湿地土壤NO3--N,增幅为108.3%~136.2%,而对低盐分芦苇湿地的影响较小,废水灌溉4次处理可明显降低土壤MBN与NO3--N含量。废水灌溉1~4次处理明显提高低盐分芦苇湿地NH4+-N含量,增幅为88.7%~170.8%。高盐分芦苇湿地只是在废水灌溉1次处理时土壤NH4+-N含量明显高于对照,增幅为45.3%,废水灌溉2~4次处理与对照差异不显著。废水灌溉处理对DON的影响较小。说明合理的废水灌溉有利于提高土壤NO3--N和NH4+-N含量,而对MBN和DON的影响较小,但废水灌溉次数以不超过3次为宜。合理的废水灌溉对提高低盐分芦苇湿地土壤NH4+-N的效果较佳,对提高高盐分芦苇湿地NO3--N的效果较佳。
In order to study the effect of papermaking waste water irrigation on the main active nitrogen components of reed wetland soils in the Yellow River Delta, the low salinity and high salinity reed wetlands were selected as research objects. Randomized block experiments were conducted to analyze the effects of different irrigation times on the microbial biomass nitrogen nitrogen, MBN, NO3 - N, NH4 + -N, and dissolved organic nitrogen (DON) in the leaves of the two cultivars. The results showed that compared with the control, waste water irrigation did not improve soil MBN, but irrigation with irrigated water for 1 to 3 times significantly increased NO3 - N content in high salinity reeds wetlands, with an increase of 108.3% ~ 136.2% The effect of waste water irrigation for four treatments can obviously reduce the content of soil MBN and NO3 - N. Wastewater irrigation 1 to 4 times significantly improve the low salinity reed wetland NH4 + -N content, an increase of 88.7% ~ 170.8%. The soil NH4 + -N content in soil with high salinity reed wetlands was significantly higher than that of the control (45.3%) when treated with wastewater once, and no significant difference between 2 and 4 times when treated with wastewater. Wastewater irrigation has little effect on DON. It shows that reasonable wastewater irrigation is beneficial to increase soil NO3 - N and NH4 + -N content, but has little effect on MBN and DON, but wastewater irrigation times should be no more than 3 times. Reasonable wastewater irrigation is better for increasing NH4 + -N in low salinity reed wetland and better for improving NO3 - N in high salinity reed wetland.