灌溉制度对老芒麦（Elymus sibiricus）生长的影响

 发展稳定、优质、高产人工草地是解决中国北方农牧交错带地区草畜矛盾的根本出路，而灌溉是发展人工草地的核心。本文于2001～2003年在河北坝上地区，研究了充分灌溉和关键生育期灌溉对不同利用年限老芒麦人工草地地上部和地下部生长的影响规律。结果表明，灌溉显著增加地上生物量和株高。从关键生育期灌溉的试验结果可知灌溉时间比灌溉量更能影响老芒麦地上部的生长；灌溉处理促进了根长密度、根重密度以及地下部生物量的增加，但不同灌溉处理之间地下部生物量差异不显著。

Effects of Irrigation Regime on Growth of Elymus sibiricus Swards

Promoting sustainable development of improved grassland is an essential way to solve the feed shortage of livestock in ecton areas of Northern China. Irrigation is the key strategy for developing sown grassland. To evaluate the effects of full irrigation vs irrigation during the key growing stage on above-ground and under-ground growth of Elymus sibiricus, field experiments were conducted during 2001-2003 on Bashang plateau in Hebei Provmce. The results indicated that irrigation observably improved the above-ground biomass and plant height, and the irrigating time played a more important role than irrigating amount as indicated by the results of the irrigation trial during the key growing stage. And it was showed that irrigation also increased root weight density, root length density and the under-ground biomass, although the effect of irrigation treatments on under-ground biomass was not significant.