不同pH值造纸黑液对砂质土壤的改良作用

目的]为利用造纸黑液改良砂质土壤提供理论依据。方法]将调至不同pH值的造纸黑液与砂质土壤按不同比例混合均匀,密封后在阴暗处放置30 d后,测定改良土壤的pH值等参数。结果]检测结果表明,造纸黑液的固形物、有机碳、有机质、腐植酸和水含量及pH值分别为14.70%、4.95%、9.39%、9.71%、85.30%和11.98。将造纸黑液的pH值调至5左右,与土壤混合均匀,其用量越大对土壤的改良作用越好,当造纸黑液与土壤的质量比增加到340.0/95.0时,改良土壤的pH值为6.88,土壤有机碳含量为13.53%,有机质含量为25.66%,腐殖酸含量为39.05%,容重为1.042,孔度为60.292%,随造纸黑液用量的减少,土壤对水分的保持能力降低。结论]pH值为5的造纸黑液,以340.0/95.0的比例与土壤混合能有效改良砂质土壤的肥力与保水性。

Improvement Effects of Paper-malting Black Liquor with Different pH Values on Sandy Soil

Objective] The study aimed to provide theoretical basis for improving sandy soil by utilizing paper-making black liquor.Method] The pH value of paper-making black liquor was adjusted to be different values and then mixed with sandy soil according to different proportions uniformly and after the mixture was sealed and kept in dark place for 30 d,the parameters such as pH value of improved soil were determined.Result] The detection results showed that the contents of solid substance,organic carbon,organic matter,humic acid and water content in paper-making black liquor and its pH value were 14.70%,4.95%,9.39%,9.71%,85.30% and 11.98 resp.After the pH value of paper-making black liquor was adjusted to be about 5,it was mixed with soil uniformly,the bigger its dosage was,the better its improvement effect on soil was.When the mass ratio of paper-making black liquor to soil increased to 340.0/95.0,the pH value of improved soil was 6.88,its contents of organic carbon,organic matter and humic acid were 13.53%,25.66% and 39.05%,its bulk density was 1.042 and its porosity was 60.292%.The water-retaining capacity of the soil reduced along with the decrement of the dosage of paper-making black liquor.Conclusion] The paper-making black liquor with pH value of 5 could effectively improve the fertility and water-retaining property of sandy soil through mixing it with soil according to the ratio of 340.0/95.0.