| Cite this article: | 何 靖.腐植酸一维垂直入渗试验研究[J].灌溉排水学报,,():-. |
| He Jing.腐植酸一维垂直入渗试验研究[J].灌溉排水学报,,():-. |
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| Study on one-dimensional vertical infiltration of humic acids |
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He Jing
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Shaanxi Provincial Land Engineering Construction Group Co., Ltd.
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| Abstract: |
| 【Objective】Humic acids has been widely used in agricultural production and in the field of soil restoration, in order to study the application of humic acids on the influence mechanism of water infiltration in the field.【Method】This paper selected the weathering coal humic acids which was used for indoor water infiltration test. The factors--humic acids concentration, soil bulk density, initial soil moisture content and infiltration time--were chosen for this experiment, and the experiment was conducted using an orthogonal design method including 16 treatments and 1 control test. In this experiment, the humic acids concentration was designed with different levels of 0.125%, 0.167%, 0.25% and 0.5%, soil bulk density was 1.32, 1.35, 1.37 and 1.39 g/cm3 and initial moisture content was 2%, 5%, 8% and 11%. During the experiment, the cumulative infiltration was measured by difference of water levels in Markov bottle. The water level was recorded by 1 min in the first 10 min, every 10 min from 10 to 60 min, and every 30 min from 60 to 240 min.【Result】The empirical equation was established between cumulative infiltration and influence factors. Then the partial correlation coefficient with respect to each factor could reflect sensitivity of cumulative infiltration to each factor. Based on the curves of influence factors and cumulative infiltration, an empirical model was established to estimate cumulative infiltration. The model had the determination coefficient of 0.86 and the measured and estimated values were correlated with correlation coefficient 0.9935(P<0.01). The model was validated with measured values of control test. The validation revealed R2 higher than 0.99, indicating that the established model was good at cumulative infiltration estimation. The effect of infiltration time on cumulative infiltration was the largest among all the factors. The sensitivity analysis results showed that humic acids concentration was the main factor affecting the cumulative infiltration, followed by soil bulk density, initial soil moisture content. The cumulative infiltration had a positive correlation with infiltration time; however, had a negative correlation with humic acids concentration, soil bulk density and initial soil moisture content. And also, humic acids has a significant anti-seepage effect on water infiltration, and the anti-seepage rate is 5.63%.【Conclusion】Humic acid has a certain effect on reducing the infiltration of water. |
| Key words: humic acids; water infiltration; infiltration reduction; cumulative infiltration |
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