半干旱黄土高原地区地膜覆盖和底墒对春小麦生长及产量的影响

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李凤民
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1兰州大学,干旱农业生态国家重点实验室,兰州,730000


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在年均降水量为415 mm的半干旱地区黄绵土旱地上,以春小麦为供试作物进行大田实验,研究不同底墒(包括低底墒、中底墒和高底墒)下,地膜覆盖(包括不覆膜、播种后覆膜30 d、覆膜60 d和覆膜120 d即全程覆膜)进程对作物生产的影响.结果表明,增加底墒和合理的覆膜进程均会显著增加作物的生长和产量,但底墒不同,其最佳覆膜进程不同:在低底墒时,覆膜处理反而使产量低于不覆膜处理;在中底墒时,覆膜30 d产量最高,随着覆膜时间延长,产量呈下降趋势,甚至全程覆膜产量低于不覆膜处理;高底墒以覆膜60 d产量最高.综合作物生长和产量,全程覆膜并没有多少实际意义.在同种覆膜处理下,随着底墒的增加,根生物量、地上干物质、叶面积及产量也增加显著,高底墒覆膜60 d处理的产量在所有处理中为最高.

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语种: 中文   

基金国家重点基础研究发展计划(973计划)(2002CCA00300)

关键词半干旱地区 底墒 覆膜 春小麦 生长 产量


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