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通过室外测坑灌溉试验,分析了灌水量对膜孔灌玉米不同生育时期的土壤水分运移分布和动态变化的影响。研究表明,灌水后第1天,土壤含水率以膜孔为中心呈等值线分布,土壤水分在再分布过程中出现交汇情况,交汇后土壤水分向更深度方向运移;随着生育时期的递进,膜孔中心附近的土壤含水率逐渐减小,土壤含水率在膜孔中心处最小,随着距离膜孔中心距离的增大而增大;不同灌水量对作物吸收水分后水分分布影响明显,相同深度处,灌水量越大,土壤含水率越大;玉米耗水量随灌水量增大而增大,耗水量和灌水量之间存在显著的幂函数关系。
Through outdoor test pit irrigation experiment, the effect of irrigation amount on the distribution and dynamic change of soil moisture in different growth stages of corn stalk was analyzed. The results showed that on the first day after irrigation, the soil water content was distributed in the same way as the center of the membrane pores, and the water redistribution occurred during the redistribution. After the confluence, the soil moisture migrated to a deeper direction. With the growth of And the soil water content near the center of the membrane pore gradually decreased. The soil moisture content was the smallest at the membrane pore center and increased with the distance from the membrane pore center. The different irrigation volume had an effect on the water distribution after the crop absorbed moisture Obviously, at the same depth, the larger the irrigation amount, the greater the soil moisture content. The water consumption of maize increased with the increase of irrigation amount, and there was a significant power function relationship between water consumption and irrigation amount.