地膜覆盖对盐碱地紫花苜蓿生长性状及产量的影响

地膜覆盖是盐碱地增产的重要途径之一，为了推进地膜覆盖在盐碱地紫花苜蓿(Medicago sativa)生产中的应用，在河西走廊玉门市黄花农场开展了大田试验，研究了不同盐浓度条件下地膜覆盖对紫花苜蓿生长性状和产量的影响。结果表明，随盐浓度增加，紫花苜蓿出苗率、存活率、 越冬率和产量呈降低的变化态势，而地膜覆盖显著增加了紫花苜蓿出苗率、存活率、越冬率、株高、茎叶比和产量，且在地膜覆盖和盐浓度为0.5%时紫花苜蓿总产量显著高于盐浓度为0.3%无地膜覆盖时的紫花苜蓿总产量，说明地膜覆盖可以应用于盐碱地紫花苜蓿的种植。

Effects of plastic-film mulch on growth traits and yield of alfalfa (Medicago sativa) in saline-alkaline fields

Plastic-film mulch is one of the important ways to increase production in saline-alkali fields. In order to promote the application of plastic-film mulch on alfalfa (Medicago sativa) production, the field experiments about the effects of plastic-film mulch on growth traits and yield of alfalfa under different salt concentration were conducted in huanghua farm, yumen district of hexi corridor. The results showed that the germination rate, survival rate, overwintering rate and yield decreased with the increase of salt concentration, while plastic film mulch significantly increased (P0.05) above indices and the stem-leaf ratio of alfalfa. The yield with plastic-film mulch under higher salt concentration (0.5%) was significantly higher (P0.05) than that without plastic-film mulch under lower salt concentration (0.3%) which suggested that plastic-film mulch could be applied to the production of alfalfa.