Effects of Corncob on Capillary Water Transport and Evaporation Characteristics of Sandy Soil
In order to explore the effective utilization of corncob in arid areas and improve its utilization rate,the water absorption and evaporation experiments were carried out by mixing 1.5～6.0 mm corncob particles with aeolian sand by means of soil column simulation.The water absorption,wetting front,evaporation,evaporation rate et al.of the soil column with 10 kinds of corncob added were measured,and the soil column without corncob was used as the control.The effects of corncob and its dosage on water absorption and water retention in sandy soil were analyzed.The results showed that the rising height of capillary water in the mixed soil was 0.0%～76.3%lower than that of the control,the average rise rate of capillary level was 7.3%～78.7%lower than that of the control,and the evaporation intensity was 10.7%～64.2%lower than the control.When the addition amount of corncob≤40%,the water absorption was 8.6%～16.2%higher than the control;when the addition>40%,the water absorption was 1.1%～46.0%lower than the control.There was a power function relationship between capillary water rise height and time,a power function relationship between groundwater recharge and time,and a linear correlation between groundwater recharge and capillary water rise.After adjustment,the Green-Ampt model under water absorption could be used to simulate the capillary water rise process of mixed soils.The Rose evaporation models could express the variation characteristics of the cumulative evaporation of mixed soils with time.The results provided a theoretical basis for the corncob material in the practice of desertification land management and straw returning to the field to improve cultivated land.
corn cobsandy soilwater transport modelcapillary water risingevaporation
万方数据
维普
