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中国农学通报 ›› 2018, Vol. 34 ›› Issue (25): 159-164.doi: 10.11924/j.issn.1000-6850.casb17060069

• 工程 机械 水利 装备 • 上一篇    

添加γ-聚谷氨酸对膜孔灌自由入渗特性的影响

杨扬   

  1. 西安理工大学
  • 收稿日期:2017-06-12 修回日期:2017-08-15 接受日期:2017-08-24 出版日期:2018-09-07 发布日期:2018-09-07
  • 通讯作者: 杨扬
  • 基金资助:
    国家自然科学基金资助项目“浑水膜孔灌理论与技术要素试验及数值模拟研究”(51479161)、“果树涌泉根灌施肥土壤氮素运移特性与技 术要素研究”(51279157)

Effect of γ-PGA Addition on Free Infiltration Characteristics Under Film Hole Irrigation

杨扬   

  • Received:2017-06-12 Revised:2017-08-15 Accepted:2017-08-24 Online:2018-09-07 Published:2018-09-07

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10cm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10cm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。

关键词: 黄瓜霜霉病, 黄瓜霜霉病, P. cubensis, 病理分化, 抗性遗传, 综合防治

Abstract: To reveal the effect of γ-PGA application rate on the characteristics of single-point free soil water infiltration 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, cumulative infiltration rate, soil moisture distribution and infiltration wetting body were studied. The results showed that the free infiltration under γ- PGA application was in accordance with the Kostiakov model of soil water infiltration, 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 migration characteristics 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 + EtF model. The influence of γ- PGA on the moisture distribution of wetting body was obvious and the moisture content of wetting body in the 10 cm range of the center 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 could provide reference for the future study of film hole infiltration.

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