中文摘要：

对西南干热河谷地区夏玉米农田土壤在不同覆盖方式下其温度变化影响进行了研究，结果表明，不同覆盖方式下，旱地玉米农田土壤温度变化情况呈现出差异性。在0-25cm土层范围内，夏玉米生育前期秸秆覆盖土壤日均温度比裸地要低，而地膜覆盖土壤日均温度要高于裸地，到了生育后期，不同覆盖方式下的土壤温度日均差异明显降低，其中以地膜覆盖方式下的土壤日平均温度变化最小；土壤温度随土层加深变化幅度逐渐减小，且不同覆盖方式下的温度变化逐渐趋于一致，其中地膜覆盖的增温缓温作用优于秸秆覆盖；土壤温度的变化与气温的相关函数均呈正向相关性，但随土壤深度增加，相关性减弱；最后通过比较产量数据，得出稳定的土壤温度有利于提高夏玉米产量，且地膜覆盖方式在增产增收方面具有显著优势。

英文摘要：

The changes of soil temperature in the summer corn field in a dry-hot valley area under different coverage methods were determined. The results showed variations of that the soil temperature in corn field with different coverages. In the range of 0 to 25 cm soft layer, the soil temperature in the summer corn field covering with straw was lower than in the uncovered field during the earlier growing stage, but the soil temperature cover- ing with plastic film was higher than in the uncovered field. The difference in temperature between the soils with different coverages was very small during the later growing stage and plastic film mulching showed a minimal change; the. soil temperature decreased gradually with increasing of the soil depth and the change under different coverages gradually converged. Particularly, plastic film mulching showed significantly better warming effect than that of straw mulching. The correlation between the soil temperature and air temperature changes showed a posi- tive synergy, but it weaken with an increase of the soil depth. Therefore, we concluded that keeping soil tempera- ture stable is beneficial to yield improvement and the covering with plastic film has a significant advantage in in- creasing production and income.