一、前言老芒麦(Elymus sibiricus (L) Nocvski)又名西伯利亚披碱草、垂穗大麦草等,是披碱草属多年生禾本科牧草,为内蒙古自治区推广的优良牧草品种。老芒麦的分布根据耿以礼教授的记载,主要分布在我国东北、华北、西北及四川等地,苏联、朝鲜及日本也有分布。老芒麦作为栽培牧草在国外开始于十八世纪末, I. INTRODUCTION Elymus sibiricus (L) Nocvski, also known as Siberian Elymus, Echinochloa crusgalli and so on, is a perennial gramineous pasture of Elymus, and is an excellent forage variety promoted in Inner Mongolia Autonomous Region. According to Professor Geng Yili’s records, the distribution of Elymus spp. Is mainly distributed in Northeast China, North China, Northwest China and Sichuan, as well as in the Soviet Union, North Korea and Japan. Siberian maize as cultivated forage in foreign countries began in the late eighteenth century,