:1993～ 1997年 ,在高寒区旱地采取地膜覆盖、秸秆覆盖、下铺秸秆上覆地膜等覆盖方式 ,与传统耕作不覆盖进行比较 ,研究了其对产量及生态效应的影响。结果表明 ,下铺秸秆上覆地膜处理可有效克服单纯覆盖消耗地力过重和单纯整秸秆覆盖又导致地温下降的弊病 ,能显著提高玉米单产。原因主要是有效地调节了地温 ,延长了生育期 ;提高了土壤的贮水能力和降水利用效率 ;土地用养结合 ,水、肥、气协调供应 : From 1993 to 1997, mulching, straw mulch, straw mulching and other covering methods were adopted in the dry land in the alpine area to compare with the traditional tillage without covering, and the effects on yield and ecological effects were studied. The results showed that overlying plastic film mulching treatment of lower straw could effectively overcome the shortcomings of over-consumption of simple mulching and simply covering of whole straw, resulting in the decrease of ground temperature, which could significantly increase corn yield. The main reason is that the ground temperature is effectively adjusted and the growth period is prolonged; the water storage capacity of the soil and the utilization efficiency of precipitation are improved; the land supply and storage is combined with the supply of water, fertilizer and gas