| Cite this article: | 张路,吴军虎.施加黄腐酸钾对黑垆土土壤结构的影响[J].灌溉排水学报,2022,(10):-. |
| Zhang lu,Wu Junhu.施加黄腐酸钾对黑垆土土壤结构的影响[J].灌溉排水学报,2022,(10):-. |
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| DOI： |
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| Effect of Applying Potassium Fulvic Acid on Structure of Dark Loessial Soil |
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Zhang lu1,2,3, Wu Junhu1,2,3
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1.xi'2.'3.an university of technology
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| Abstract: |
| By adding potassium fulvic acid with different application to the dark loessial soil, combined with laboratory experiments, the effects of potassium fulvic acid on the water transport, soil pores and aggregate composition of the dark loessial soil were explored. The results showed that: (1) For the soil sample treated with 1% potassium fulvic acid, the cumulative infiltration rate, infiltration rate (90min), stable infiltration rate and wet front migration distance increased by 43.96% ,182.5%, 47.06% and 28.41% respectively. (2) The fitting results of the three infiltration model parameters show that the empirical coefficient in the Kostiakov Formula attenuates from 1.6487 to 0.9013, and the empirical index increases from 0.4781 to 0.5375. In the Philip Formula, the stable permeability is in the range of 0.0020 to 0.0031, and the absorption rate fluctuates in the range of 0.9562 to 1.0042. In the improved Kostiakov Formula, the stable infiltration rate increased from 0.0126 to 0.0846. (3) The soil sample mixed with 1% potassium fulvic acid increased the aeration porosity of the soil by 64.29%, the capillary porosity of the soil decreased by 17.00%, and the total soil porosity increased by 2.65%. At the same time, the larger the mass ratio of potassium fulvic acid mixed in the soil sample, the soil density decreased by 2.99% compared to the control group in terms of unit volume. (4) With the increase of the culture time, the content of agglomerates with a particle size greater than 0.25mm increased significantly, while the content of agglomerates with a particle size less than 0.045mm gradually decreased. There is a positive correlation between the mean geometric diameter and the potassium fulvic acid application rate, while the unstable aggregate index and soil erodibility factors are negatively correlated with the increase of the potassium fulvic acid application rate, with potassium fulvic acid and time incresse the fractal dimension has a positive correlation. The research results provide a reference for revealing the mechanism of action of different application rates of potassium fulvic acid on improving the structure of dark loessial soil. |
| Key words: Potassium fulvic acid; moisture transport; soil porosity; water-stable soil aggregate; soil structure |
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