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为研究造纸废水灌溉对轻度盐碱退化芦苇湿地土壤改良效应的影响,通过设置不同废水灌溉次数下的随机分组实验,分析不同灌溉次数下芦苇湿地土壤理化性质及酶活性的参数变化。结果表明:(1)随着造纸废水灌溉次数的增加,土壤容重有下降趋势,土壤持水量、总孔隙度则呈上升趋势;土壤pH呈显著下降趋势,含盐量则表现为先下降后增加;(2)土壤速效N、速效P、速效K含量随着造纸废水灌溉次数的增加呈显著上升趋势,分别比CK增加19.73%～73.42%,14.32%～73%,12.49%～60.6%,4次灌溉后上升趋势有所减缓;(3)随着造纸废水灌溉次数的增加,土壤脱氢酶显著增加,比CK高出1.4～2.8倍,而磷酸酶和脲酶分别高出1.3～2.0倍,1.7～2.6倍,并在4次灌溉后增加趋势减缓;(4)土壤微生物量碳含量随着造纸废水灌溉次数的增加呈现上升趋势,比CK增加了0.15～1倍。该研究结果为黄河三角洲盐碱湿地造纸废水合理灌溉提供了试验依据。
In order to study the influence of papermaking waste water irrigation on soil improvement in mild saline-alkali degraded reed wetland, the parameters of soil physical and chemical properties and enzyme activity of reed wetland under different irrigation times were analyzed by setting up randomized groups under different irrigation times. The results showed as follows: (1) With the increase of the times of papermaking wastewater irrigation, the bulk density of soil had a downward trend, soil water content and total porosity showed an upward trend. Soil pH showed a significant downward trend while salinity decreased first and then increased ; (2) Soil available N, available P and available K increased significantly from 19.73% to 73.42%, from 14.32% to 73% and from 12.49% to 60.6%, respectively, compared with CK (3) With the increase of irrigation frequency of papermaking wastewater, the soil dehydrogenase increased significantly, 1.4 ~ 2.8 times higher than CK, while the phosphatase and urease were 1.3 ~ 2.0 times higher than CK, 1.7 ~ 2.6 times, and the trend of increase was slowed down after 4 times of irrigation. (4) The content of soil microbial biomass carbon increased with the increase of times of papermaking wastewater irrigation, which was 0.15 ~ 1 times higher than that of CK. The results of this study provide the experimental basis for the reasonable irrigation of papermaking wastewater from saline-alkali wetlands in the Yellow River Delta.