早熟禾(Poa annua L.)、草地早熟禾(P.prafensis L.)和多年生黑麦草(Lolium perenne L.)是在建立草坪草层中具有不同优势能力的三种禾本科牧草。多年生黑麦草和早熟禾生长十分健壮,尤其是在定植期间。草地早熟禾是一种侵占性比较差的牧草。草坪草型的多年生黑麦草和草地早熟禾是很理想的草坪草,早熟禾则是一年生杂草。早熟禾在草坪草层中是一种危害很 Poa annua L., P. prafensis L. and L. perenne L. are three grass species that have different predominance in the establishment of turfgrass. Perennial ryegrass and bluegrass grow very robust, especially during colonization. Poa pratensis is a less aggressive grass. Lawn grass-type perennial ryegrass and meadow grass is an ideal turfgrass, Kentucky bluegrass is an annual weed. Poa turcica grass layer is a hazard