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造纸废水含有大量有机营养物质,经生物塘处理后灌溉退化滨海盐碱地可以有效改善土壤化学性质。分析了不同灌溉方式对土壤脲酶、磷酸酶、脱氢酶活性的影响。结果表明:在废水灌溉、清污轮灌和清水灌溉3种处理下,棉田土壤的脲酶、磷酸酶和脱氢酶活性均有显著提高;同样,清污轮灌模式下,轻度、中度及重度盐碱化土壤的脲酶、磷酸酶和脱氢酶活性也均有较显著的提高。较之棉田土壤和轻度盐碱化土壤,中度和重度盐碱化土壤酶活性的提高更为显著,具体表现为,与对照相比,中度盐碱化土壤的脲酶、磷酸酶以及脱氢酶活性分别提高了44.7%、15.6%、12.4%,重度盐碱化土壤分别提高了82.3%、55.1%、32.0%。研究证明造纸废水灌溉不但可以提升退化盐碱地的土壤肥力,还可以显著提高退化盐碱地的土壤酶活性。
Papermaking wastewater contains a large amount of organic nutrients. After biological ponds are treated, the degraded coastal saline-alkali soil can be effectively treated to improve soil chemical properties. The effects of different irrigation methods on soil urease, phosphatase and dehydrogenase activities were analyzed. The results showed that the activities of urease, phosphatase and dehydrogenase in cotton soil were significantly increased under the three treatments of waste water irrigation, clean irrigation and irrigation with clean water. Similarly, And severe soil salinization of urease, phosphatase and dehydrogenase activity also have a more significant increase. Compared with cotton soil and light salinized soil, the soil enzyme activity of the moderate and severe salinization increased more significantly, which was manifested in that compared with the control, the soil urease, phosphatase, The activities of hydrogenase increased by 44.7%, 15.6% and 12.4%, respectively. The soil salinization increased by 82.3%, 55.1% and 32.0% respectively. The research proves that irrigation of papermaking wastewater can not only improve soil fertility in degraded saline-alkali soil, but also significantly increase soil enzyme activity in degraded saline-alkali soil.