吉林西部苏打盐碱土在不同添加物下水分入渗特性

依据土壤水动力学理论,基于室内一维土柱入渗试验,选用稻壳、玉米秸秆、河沙3种材料作为添加物,分别将添加物以不同掺量与土壤均匀混合对苏打盐碱土进行入渗试验,从累计入渗量、入渗速率、湿润锋运移距离等方面研究苏打盐碱土在不同添加物及不同掺量下水分的入渗特性.结果表明:对照组土壤入渗量为3 mm·d-1,混掺1％稻壳、玉米秸秆...

Water infiltration characteristics of soda saline|alkaline soil under different additives in Western Jilin

In order to improve the water infiltration performance of the soda saline|alkaline soil in Western Jilin, the irrigation efficiency of farmland, and the yield of crops, experimental research on moisture characteristics were conducted. According to the theory of soil hydrodynamics, based on the indoor one|dimensional soil column infiltration test, three materials of rice husk, corn stalks and river sand were selected as additives. The three additives were uniformly mixed with the soil in different dosages to perform infiltration tests on soda saline soil. Four aspects of water infiltration characteristics of soda saline|alkaline soil under different additives and different content including cumulative infiltration rate, infiltration rate, wet front migration distance, and soil moisture content were examined. The results showed: the soil infiltration rate of the control group was 3 mm·d^-1, and the soil infiltration rate when mixed with 1% rice husk and corn stalks were 7.08 mm·d^-1 and 7.37 mm·d^-1. The soil infiltration rates when mixed with 3% rice husk and corn stalks were 18.9 mm·d^-1 and 23.07 mm·d^-1. When mixed with 5% rice husk and corn stalk, the soil infiltration rate was 21.17 mm·d^-1 and 28.5 mm·d^-1. The stable infiltration rate of soil in the control group was 0.04 mm·h^-1, and the stable infiltration rate of soil mixed with 1%, 3%, and 5% rice husk was 0.17, 0.55, 0.60 mm·h^-1. The stable infiltration rate of soil mixed with 1%, 3%, 5% corn stalks was 0.25, 0.70, 1.00 mm·h^-1 respectively. The stable infiltration rate of mixed 25%, 40%, 55% river sand soil was 0.08, 0.09, 0.10 mm·h^-1. The distance of the wet front in the control group was 4.9 cm, and the distance of the wet front in the soil mixed with 1%, 3%, and 5% rice husk was 10.1, 30 cm, and 38.3 cm. The migration distances of soil moisture front mixed with 1%, 3%, and 5% corn stalks were 11.6, 32, 47 cm. The distances of the wet fronts of mixed 25%, 40%, and 55% river sand were 6.5, 7.8 cm, and 9 cm. Based on the results, mixing with 5% corn stalks greatly increased the cumulative infiltration of soil and the rate of water infiltration, and the range of infiltration reached the root system of the crop. Therefore, the mixing of 5% corn stalks with the soil improved the infiltration effect of soda saline|alkali soil in Western Jilin, which can be beneficial to comprehensively improve the soil moisture infiltration and water retention performance.