【摘要】 本文用苜蓿、苇状羊茅和无芒雀麦为材料,根据其生物学特点进行混播,并对混播牧草的生长特点和生产性能与单播进行比较,以便找到利用该类混播草地的规律。结果表明:混播与单播牧草的全年生育期均为90～100d,绿期220～230d,和单播相比,混播能提高牧草的茎叶比和分蘖数,降低鲜干比,对叶面积系数影响不大。混播和单播牧草地上生物量动态均呈现S型动态曲线,生物量增长最快在抽穗扬花期,生物量最大值在成熟期,其中蜡熟期是单播或者混播牧草的最佳利用时期。牧草混播的生产水平高于苇状羊茅和无芒雀麦的单播,低于苜蓿的单播。更多还原

【Abstract】 According to biological characters,alfalfa,tall fescue and smooth brome were sowed together in order to analyze biological characteristics and production capabilities.Aims of experiment were to seek utilizing principle of mixed grassland.The results showed that mixed or single forage had 90-100 day duration and 220-230 d green period.Compared with single sowing,mixed sowing could raise stem to leaf ratio(S/L ratio) and tillering number of grasses,decrease fresh to dry ratio(F/D ratio),no apparent effects were on leaf area index(LAI).Aboveground biomass of mixed or single sowing forage appeared"S"dynamic model with the fastest growth rate in heading and flowering period and had biomass peak in ripening period,but it was optimal for forage to be harvested in wax ripening period.Mixed sowing had greater production levels than single sowing of tall fescue or smooth brome,but lower than single sowing of alfalfa.更多还原