作物学报 ›› 2018, Vol. 44 ›› Issue (02): 268-277.doi: 10.3724/SP.J.1006.2018.00268
谢军红1,2, 李玲玲1,2, 张仁陟1,3, 柴强1,2,*(
)
Jun-Hong XIE1,2, Ling-Ling LI1,2, Ren-Zhi ZHANG1,3, Qiang CHAI1,2,*(
)
摘要:
为了揭示黄土高原半干旱区玉米(Zea mays L.)种植中覆膜、沟垄作的增产作用和水分利用特征, 布设大田定位试验, 包括全覆膜沟垄作、全覆膜平作、半覆膜平作和不覆膜平作4个处理。结果发现, 连续3个平水年中, 全膜沟垄作集成了全覆膜与沟垄作的优点, 产生明显的叠加效应, 较半膜平作分别增产2282.9、2460.2和2765.5 kg hm-2, 增产率为32.3%、49.8%和46.5%。其中, 全覆膜的贡献分别为59.3%、90.3%和20.9%, 沟垄作的贡献分别为40.7%、9.7%和79.1%。叠加效应中全覆膜与沟垄作对产量的贡献呈此消彼长态势, 连作前两年, 全覆膜的作用大于沟垄作, 连作第3年, 沟垄作的作用大于全覆膜。玉米的水分利用效率, 全膜沟垄作较半膜平作的增幅为10.6%~25.2%。在同等降水条件下, 全覆膜沟垄作、全覆膜平作处理播前土壤贮水量较不覆膜平作增幅分别达6.3%~15.1%和3.5%~11.5%。收获期土壤贮水量明显低于不覆膜平作, 降幅达6.0%~12.9%和4.7%~7.5%。随着连作年限的增长, 土壤贮水量呈递减趋势, 连作第2、第3年收获期全覆膜沟垄作、全覆膜平作较连作开始土壤贮水量分别降低37.1%、44.0%和35.5%、40.9%, 连作第2年全覆膜沟垄作在50~200 cm出现干燥化现象, 第3年各处理30~200 cm土层均出现干燥化现象。综上所述, 全覆膜沟垄作具有明显的增产和提高水分利用效率的作用, 但其较高的产量以高耗水为代价, 在连续低降水条件下, 3年玉米连作会导致土壤干燥化, 存在生态安全风险。
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