【摘要】 2003年3-10月在河西走廊中段张掖市红沙窝村探索不同灌溉方式(沟灌、隔沟灌、畦灌、漫灌)下紫花苜蓿Medicago sativa地上生物量、土壤含水量变化规律及它们之间相互关系。结果表明,第1年紫花苜蓿种植中,在出苗期和营养生长前期,隔沟灌土壤含水量最高,沟灌土壤含水量次之,再次为常规漫灌,畦灌的土壤含水量最低(如7月1日测定常规漫灌、畦灌、沟灌和隔沟灌0~120 cm平均土壤含水量分别为6.3%、5.7%、7.8%和8.9%),随着紫花苜蓿生育进程的延续和降水量减少,各处理间的土壤含水量差异逐渐变小。在各个生育关键时期,常规漫灌和畦灌的干物质量均大于沟灌和隔沟灌。在紫花苜蓿整个生育期,在各处理中畦灌水分利用效率(WUE)最高,常规漫灌WUE略低于畦灌,但常规漫灌的WUE大于沟灌和隔沟灌,在第1年种植的紫花苜蓿生长中,常规漫灌、畦灌、沟灌和隔沟灌WUE分别为4.20、4.49、3.67和3.56[kg/(mm.hm2)]。更多还原

【Abstract】 The study was undertaken at Hong Sha-wo village in Zhang-Ye irrigation area of He-xi corridor during March to October in 2003,to find the various regulations and the relationship between alfalfa top biomass and soil water content in different irrigation methods,furrow irrigation,separating furrow irrigation,border irrigation and traditional irrigation as control.The results are showed as following,in the first year of alfalfa growth,the soil water content of separating furrow is the highest than any treatments,the soil water content of furrow irrigation is higher than that in border irrigation and that in traditional irrigation,the soil water content of border irrigation is the lowest in the seedling stage and the early period of vegetative growth of alfalfa,the variation of soil water content in different irrigation are becoming smaller with extension of alfalfa growth stage and decreased rainfall,for example,in 0～120 cm layer the average soil water content of traditional irrigation,border irrigation,furrow irrigation and separating furrow irrigation are 6.3%,5.7%,7.8% and 8.9% respectively(measured on July 1,2003).The top dry biomass weight of traditional irrigation and of border irrigation are higher than that in furrow irrigation and that in separating furrow irrigation in every key growth stage of alfalfa.The water use efficiency(WUE) in border irrigation is highest among treatments,the WUE in traditional irrigation is lower than that in border irrigation,but higher than that in furrow irrigation and that in separating furrow irrigation in all alfalfa growth stage,for example,WUE in traditional irrigation,in border irrigation,in furrow irrigation and in separating furrow irrigation are 4.20,4.49,3.67 and 3.56\respectively.更多还原