西藏拉萨河下游地区紫花苜蓿引种试验研究

Study on Introduction of Alfalfa in Downstream Region of Lhasa River in Tibet

在西藏拉萨河下游地区的达孜县对7个紫花苜蓿(Medicago sativa)品种进行了引种试验,测定了不同紫花苜蓿品种的生育期、株高、越冬率及草产量等,通过2008～2009年的品种间比较试验,结果表明:7个紫花苜蓿品种均可以完成生育期,但成熟种子均很少。供试的紫花苜蓿品种在西藏拉萨河下游地区均可安全越冬,第一年的越冬率均超过80%,第二年的越冬率都超过了90%。7个紫花苜蓿品种草产量在第二年较高,鲜草产量在14000.0～21000.0kg/hm2之间,干草产量在5200.0～9500.0kg/hm2之间。其中鲜草产量和干草产量最高的为中兰1号,分别为21000.0kg/hm2和9500.0kg/hm2。

A field comparative test of seven introduced alfalfa varieties was carried out at Dazi station in Tibet.The characteristics including period of duration,natural height,wintering rate,fresh yield and hay yield were tested.The paper is a result of introduced alfalfa varieties 2008 to 2009.The results showed that seven alfalfa varieties could complete period of duration,but seed yields are little.Seven alfalfa varieties in the downstream regions of Lhasa River in Tibet can live through the winter.The first year the wintering rates were over 80%and the second year wintering rates were more than 90%.The fresh yields of seven alfalfa varieties in the second year were higher than that in the first year and the average fresh yield were from 14000.0kg/hm 2 to 21000.0kg/hm2.The average hay yields of seven alfalfa varieties were from 5200.0 kg/hm^2 to 9500.0kg/hm^2.Medicago sativa L.cv.Zhonglan No.1 has the highest fresh yield and hay yield,which were respectively 21000.0kg/hm^2 and 9500.0kg/hm^2.