混播紫花苜蓿与无芒雀麦群落种间竞争分析

Analysis of Interspecific Competition in Community of Mixedly-sown Alfalfa and Awnless Brome

将紫花苜蓿和无芒雀麦以不同的比例进行间行和同行混播,以单播为对照,分析了混播牧草群落种间竞争关系,研究了不同混播处理对牧草生长、产量及品质的影响。结果表明:紫花苜蓿的株高以同行混播处理A7B3最高,以间行混播处理a6b4最低,而无芒雀麦的株高以A7B3最高,单播处理最低;以5∶5混播的牧草总产草量最高,品质较好;间行混播牧草的相对产量总和(RYT)从第1茬刈割到第2茬刈割呈上升趋势,而同行混播的RYT值呈下降趋势;处理A7B3的茎叶比显著低于其他各处理的;处理A5B5的CP、EE和NDF全年收获量在各处理中均最高;在各处理中紫花苜蓿的种间竞争力均高于无芒雀麦的。

Alfalfa（ Medicago sativa） and awnless brome（ Bromus inermis） were mixedly sown in different proportions and in different manners（ same line or interval line）. Using the singly-sown posture as the check,the author analyzed the interspecific competition in the community of mixedly- sown pasture,and studied the influences of different mixed sowing treatments on the growth,yield and quality of pasture. The results indicated that the plant height of alfalfa was the highest in the same- line mixed sowing treatment A7B3,and was the lowest in the interval- line mixed sowing treatment a6b4; while the plant height of awnless brome was the highest in the treatment A7B3,and was the lowest in the single sowing treatment. The mixedly-sown posture in the proportion of 5 ∶ 5 had the highest total grass yield and better grass quality. The relative yield total（ RYT） of interval-line mixedly-sown posture revealed a rising trend from the first batch harvest to the second batch harvest,while that of same- line mixedly-sown posture showed a decreasing trend. The stem-leaf ratio of posture in the treatment A7B3 was significantly lower than that in other treatments. The CP,EE,and NDF annual harvest yield of posture in the treatment A5B5 were the highest among all treatments. The interspecific competitivity of alfalfa in various treatments was higher than that of awnless brome.