造纸废水污灌对土壤性质及脲酶活性的影响

Influences of Pulping Wastewater Irrigation on the Soil Properties and the Activity of Urease

通过大田试验和实验室盆栽实验,研究了造纸废水污灌对土壤理化性质、呼吸强度和脲酶活性的影响及其时间的动态变化规律。结果表明,造纸废水长期污灌后,土壤有机质含量表现为少量增加,而盐碱性增强。污水灌溉早期会刺激土壤呼吸作用,浓度越大,作用越明显;后期逐渐恢复,25 d后恢复至对照水平。对土壤脲酶,则表现为先抑制、后恢复。

The dynamic influences of irrigation with pulping wastewater on soil physiochemical properties, soil respiration and activity of urease in soils were investigated in the field and pot scale. The results showed that the amount of organic matter in the soils and pH values increase. Soil respiration is simulated at the beginning of irrigation, but it recovers to the original value after 25 days. Higher concentration of the wastewater leads to higher simulation effect. The activity of soil urease decreases slightly within the first 10 days, and then increases.