摘要
为揭示γ-PGA施量配比对膜孔灌单点源自由入渗条件下土壤水分入渗特性的影响,通过对不同γ-PGA施量配比(0%、0.1%、0.5%、1%)的膜孔单点源自由入渗试验,研究了γ-PGA施量配比对入渗率、稳定入渗率、累积入渗量、土壤含水率分布、入渗湿润体的影响。研究结果表明:不同γ-PGA施量配比的膜孔灌自由入渗仍符合Kostiakov土壤水分入渗模型,且入渗速率明显降低,稳定入渗率从0.47 cm/min递减到0.15 cm/min,减小率达68%;γ-PGA施量配比对垂直湿润锋的运移特性影响最为明显,且垂直湿润锋入渗时间t与运移距离RX符合RX=D/2+EtF模型;γ-PGA施量配比对湿润体的含水率分布影响显著,处理组在距离膜孔中心10 cm范围内土壤湿润体相应层位的含水率明显高于对照组,且随着γ-PGA施量的增加土壤含水率明显增大;但是在10 cm以下区域,湿润体各层的含水率变化则与之呈相反趋势。该研究成果可以作为以后研究入渗规律和膜孔灌技术的参考。
To reveal the effect of γ-PGA application rate on the characteristics of single-point free soil waterinfiltration under film hole irrigation, infiltration experiment of different amounts of γ-PGA(0%, 0.1%, 0.5%and 1%) was carried out, the effects of γ-PGA on infiltration rate, stable infiltration rate, cumulativeinfiltration rate, soil moisture distribution and infiltration wetting body were studied. The results showed thatthe free infiltration under γ-PGA application was in accordance with the Kostiakov model of soil waterinfiltration, and the infiltration rate decreased obviously, the stable infiltration rate decreased from 0.47 cm/min to 0.15 cm/min, and the reduction rate reached 68%. The effect of γ-PGA amount on the migrationcharacteristics of vertical wetting front was the most obvious, and vertical wetting front migration distance RX and infiltration time t accorded with the RX=D/2 + EtFmodel. The influence of γ-PGA on the moisturedistribution of wetting body was obvious and the moisture content of wetting body in the 10 cm range of thecenter of film hole was significantly higher than that of CK, and increased with the increase of γ-PGA dosage,but water content change of each treatment layer was the opposite below 10 cm. The research results couldprovide reference for the future study of film hole infiltration.
引文
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