威宁草芦与豆科牧草混播种间竞争初探

Primary Study on Interspecies Competition Between Phalaris tuberose and Leguminous Grasses under Mixed Sowing Condition

通过对威宁草芦与赛特紫花苜蓿和海发白三叶单播及混播处理鲜草产量的测定,结果表明,混播人工草地产草量比单播的要高。混播处理对威宁草芦、赛特紫花苜蓿和海发白三叶的产草量的影响的最佳拟合曲线方程分别为6次、4次、4次方程式。从对各处理进行竞争力分析结果来看,混播草地的竞争力大于单播草地。处理A1B5C5的竞争力最强,达到1.602,其次为处理A1C4,处理A2C2为第三,竞争力分别为1.546和1.486;单播最低,处理A、B、C的竞争力均为1。牧草的生长速度变化随生育时期的不同而有所变化,威宁草芦的生长速度在3月下旬前较慢,以后则生长迅速,赛特紫花苜蓿和海发白三叶的生长速度则与此相反。

The fresh grass yields of treatments with single sowing or mixed sowing of Phalaris tuberose, Sitel and Haifa show that the fresh grass yield and competitive power of treatments with mixed sowing is higher than those with single sowing. The competitive power of A1B5C5,A1C4,A2C2,A,B and C treatments is 1. 602,1. 546,1. 486,1. 000,1. 000 and 1. 000 respectively. The growth rate of forage grasses varies with the change of growth period. The growth rate of Phalaris tuberose is slow before the last ten-day period of March and rapid after the last ten-day period of March but the growth rate of Sitel and Haifa is contrary to Phalaris tuberose.