混播比例对白三叶/高羊茅草地产量与品质的影响OA

To explore the optimal legume-grass sowing ratio for synergistically improving yield and quality,a two-year field experiment with multiple mowings was conducted on the Loess Plateau.Five sowing patterns of white clover(Trifolium repens)and tall fescue(Festuca arundinacea)were evaluated,including monocultures of each species and mixtures at legume-to-grass ratios of 1:1,1:2,and 1:3.The study aimed to assess the seasonal dynamics of forage yield and nutritional quality under different patterns and to identify the optimal strategy using a coupling coordination degree model.The results indicated that mixed sowing exhibited significant overyielding effects.Specifically,the mix-tures with 1:2 and 1:3 ratios achieved the highest total yields,which were significantly increased by 23.92%-62.71%compared to monocultures(P<0.05).Regarding quality,compared with the monoculture of tall fescue,mixed sowing effectively increased crude protein content and reduced fiber content.The coupling coordination degree analysis of yield and quality demonstrated that the 1:2 legume-grass ratio is the optimal pattern for achieving synergistic development.This pattern not only achieved synchronous optimization in yield and quality but also maintained a high-level coordina-tion state throughout the growing season.Consequently,it extends the window period for optimal utilization,making it the ideal strategy for establishing high-yielding,high-quality,and stable grasslands.