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- 2015
一维代数模型在砂质盐碱土改良中的适应性研究
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Abstract:
为探讨一维代数模型在砂质盐碱土改良过程的适应性，以PAM和旱地龙改良剂为材料，各设3种施量（PAM 0.01%、0.04%、0.08%；旱地龙75、150、375 g·m-2）进行室内垂直一维积水入渗试验。结果表明，施加化学改良剂对砂质盐碱土起减渗作用；由试验实测资料推求出一维代数模型中的土壤水分运动参数：土壤饱和导水率Ks随着改良剂施量的增加呈先降低后升高的趋势，与对照处理相比，其平均降低比率PAM和旱地龙处理各为36.9%和35.71%；模型中综合形状系数α变化趋势随改良剂施量的增加均呈增大-减小趋势；而吸力系数β随改良剂的种类及施量的增加变化趋势不明显；模型适应性检验中PAM、旱地龙处理中最大相对误差分别为-4.66%、-9.81%，其余处理的相对误差均小于5%，表明使用该模型能够有效地描述改良剂施加条件下砂质盐碱土的入渗过程，且该模型在PAM施加过程中适用性较好。
In order to discuss the applicability of one dimensional algebraic model on amelioration of sandy saline alkali soil, taking the PAM and the Handilong amelioration agents as the material, set up three amounts as PAM (0.01%, 0.04% and 0.08%) and Handilong (75 g·m-2, 150 g·m-2 and 375 g·m-2), one dimensional infiltration experiment was conducted in laboratory. The results showed that: Added the chemical amelioration agent will be played the function as reduced the infiltration in sandy saline alkali soil. The soil water moving parameters of the one dimensional algebraic model can be derived from the experimental measured data. The soil saturated hydraulic conductivity Ks was shown the trend at first reduce and later increase with increasing the amount of amelioration agent, compared with the control treatment, the average reduce ratio were 36.9% and 35.71% respectively for the PAM and Handilong. However, the model integrated form factor α showed an increasing-decreasing trend with increasing the amount of amelioration agent. The suction coefficient β was not obvious change with the type and increasing amount of amelioration agent. In the model applicability test, the maximal relative error were -4.66%, -9.81% respectively for the PAM and Handilong treatment, and the relative error of other treatment was total less than 5%. So it indicated that this model can be effectively described the infiltration process of sandy saline alkali soil by added amelioration agents condition, also this model’s applicability was rather good in adding PAM process.
