中文摘要：

基于大田试验，研究了不同覆膜方式（不覆膜、春覆膜、秋覆膜、秋覆膜覆土）对河西灌区小麦产量和土壤生态环境的影响。结果表明，与不覆膜处理相比，覆膜处理小麦产量提高26．4％～45．6％，其中秋覆膜和秋覆膜覆土处理小麦产量、基本苗数量、成穗数和收后主要农艺性状均最佳，小麦拔节期前耕层土壤（O～20cm）含水率增加了2．8％～5％；与不覆膜处理相比，覆膜尤其是秋覆膜，小麦苗期早上的耕层（O～15cm）地温提高了O～3℃，小麦拔节后期中、下午的耕层（O～15cm）地温降低了1～11℃，秋覆膜提高了小麦苗期早上的耕层地温，但降低了拔节后期中下午的耕层地温。

英文摘要：

Field experiment wheat yield and soil ecolog increased by 26.4%-45.6 ment without mulched In s were carried out to study the effect of different plastic film mulched modes on ieal environment in Hexi irrigated area. The results indicated that wheat yield % significantly in the treatment of plastic film touched compared to the treat- the treatments of autumn mulched and autumn mulched soil, the yield, basic seedlings, ear number, the best （0-20 cm） before jointing stage mulched; topsoil （0-15 cm） creased by 1-11 ℃ at jointin mulched. main agronomic characters were increased by about 2. 8% - 5% temperature lncreas g late stage in the the top, and topsoil water compared to the treatment ed by 0-3 ℃ at seeding stage in the morning, afternoon under plastic film muched, especially content without and de- autumn