冰草属植物在内蒙古干旱草原的建植试验

Establishment of Different Agropyron Species & Cultivars in Arid and Seml-arid Grasslands of Inner Mongolia.

对冰草属当地材料和北美引进品种在内蒙古干旱草原旱作条件下的建植试验表明，当地的蒙古冰草（ＡＧＭＯ＿１、ＡＧＭＯ＿２）和西伯利亚冰草（ＡＧＳＩ）都具有广泛的适应性，无论播种期干旱与否，均可获得较好的建植效果，在较好的降水条件下有极显著的增值。当地的沙生冰草（ＡＧＤＥ）在干旱生境可发挥建植优势，其建植水平不会因降水条件好转而提高。北美引进品种Ｈｙ－ｃｒｅｓｔ、Ｋｉｒｋ、Ｆａｉｒｗａｙ、Ｐ－２７、Ｐａｒｋｗａｙ、Ｓｙｎｔｈｅｔｉｃ－Ｈ和Ｅｐｈａｒｉｍ在旱作条件下建植成功与否取决于播种期的降水条件，如果降水条件较好，可以获得与当地材料同等水平的建植效果。

Comparing within 11 tested accessions of Agropyron,all the native species have better adaptability to dry conditions than the introduced cultivars form the North America. A- gropyron mongolicum(two accessions)and A. sibiricum showed most successful estab- lishment in the two experimental areas(Huhhot,semi- arid region and Haiya, arid re- gion)in an extrame dry year(1991)precipitation was 27.4～42.8% less than the nor- mal during June to September).Agropyron desertorum established much better in Haiva than in Huhhot.For the seven indroduced cultivars form the North America,the precipitation of seeding year was the most important factor affecting their emergence and establishment.All of the introrduced cultivars had little or no stand when sown in dry year. But all ,especially Hycrest and p-27,had successful establishment as good as the natives when sown in normal rain fall year(1992).