刈割对缘毛雀麦3个品系再生的影响

在缘毛雀麦Bromus ciliatus 3个品系生长进入拔节期后，通过不同留茬高度（0～2、2～4、4～6 cm）的刈割处理，对其再生特性进行了测定分析。结果表明：各品系留茬高度与牧草再生速度呈显著正相关(r=0.724 1,P<0.05)，其中9708品系留茬4～6 cm刈割后再生速度较快，9714品系留茬0～2 cm刈割后再生速度较慢；在同样刈割处理条件下，9708品系和9714品系再生分蘖数无差异(P>0.05)，9701品系在第2次刈割留茬4～6 cm时，再生分蘖数显著(P<0.05)高于其他2个品系；随留茬高度的增加，9701品系和9708品系的总干草产量递增，而9714品系的总干草产量却呈递减趋势。9701品系和9708品系的适宜留茬高度为4～6 cm，9714品系适宜留茬高度是0～2 cm。

Effect of cutting on regeneration of three strains of Bromus ciliatus

In this experiment, regeneration performance of three strains of Bromus ciliatus was analyzed with different stubble height (0-2,2-4,4-6 cm) during the jointing stage. The results showed that the stubble height and regenerating speed of forage had significant positive correlation(r=0.724 1,P<0.05), among which 4-6 cm (stubble height) of 9708 strain had faster regeneration speed and 0-2 cm (stubble height) of 9714 strain had lower regeneration speed. In same cutting treatments, the regeneration tillers of 9708 and 9714 strains had no difference (P>0.05), and tillers of 9701 strain were higher significantly than other two strains when the second stubble height was 4-6 cm. With stubble height increasing, total dry grass yield of 9701 and 9708 strains had a progressive increase, and the 9714 strain had a progressive decrease. The suitable stubble height of 9701 and 9708 strains was 4-6 cm and the height of 9714 was 0-2 cm.