氨化椰糠基保水剂对娄土持水性能影响研究

Study on the Effect of Coconut Chaff Water-Retaining Agent on Water Holding Capacity of Lou Soil

本研究制备了一种氨化椰糠粉(AM/CBP)保水剂,结合室内基础试验与室内土壤环境模拟,分别以1%,5%和15%的3种用量将保水剂施入土壤中(1%,5%和15%AM/CBP-MIXED),探讨保水剂对陕西娄土物理性质及水分分布的影响。研究获得以下结论:1)经过接触角试验发现,制备后的保水剂亲水性提升,AM/CBP接触角为14.81°,证明其亲水性较好;2)AM/CBP能减少土壤容重,从提高土壤熟化度与总孔隙度分析。AM/CBP能增强土壤同一吸力下的含水量与饱和含水量,且这种趋势随着施加比例的增加而增加,残余含水量也符合此规律。3种比例的AM/CBP-MIXED土壤含水量增长由低到高依次为0%~193.1%,21.7%~381.7%和31.6%~604.3%;3)Gardern-Russo模型拟合能较精确地拟合AM/CBP-MIXED的土壤水分特征曲线。AM/CBP在5%的施加比例下拥有较大的田间持水量和总有效利用水,是最佳施加比例。

In this study,an ammoniated coconut bran powder(AM/CBP)water retention agent was prepared.Combining indoor basic tests with indoor soil environment simulations,water retention agents were applied to the soil at three dosages of 1%,5%and 15%(1%,5%and 15%AM/CBP-MIXED)to investigate the effects of water retention agents on the physical properties and water distribution of Lou soil in Shaanxi.Our study draws the following conclusions:1)The hydrophilic test shows that the contact angle of AM/CBP is 14.81°,indicating its excellent hydrophilicity;2)AM/CBP can reduce soil capacitance from increasing soil maturity and total porosity analysis.AM/CBP-MIXED can enhance the water content and saturated water content of soil under the same suction force,and this trend increases with the increase of the applied ratio.The residual water content conforms to this rule.The increase of soil water content in the three proportions of AM/CBP-MIXED from low to high is 0%~193.1%and 21.7%~381.7%and 31.6%~604.3%;3)The Rardern-Russo model can fit the soil water characteristic curves of water retaining agents accurately.5%is the most suitable application ratio in group of AM/CBP-MIXED,which has a larger field water capacity and total efficient water use,the lower unusable water,which is the best applied ratio.