【摘要】 利用植物组织转化分析方法，研究羊茅黑麦草在不同刈割时期和留茬高度对叶片净生长和净牧草积累的影响。结果表明，低茬（2和6cm）刈割时叶片净生长动态呈“S”曲线型；而高茬（10和14cm）则割为抛物线型，但其第二茬则呈“S”曲线型。牧草净积累在各处理中均以“S”型曲线增长。对后初期叶片净生长率表现为高茬大于低茌，后期则相反。牧草净积累率在第一茬为低茬大于高茬，早期变化幅度大于晚期。在第二茬则相反。更多还原

【Abstract】 Effects of defoliation on leaves net growth and net herbage accumulation (NHA) in Festulolium with method of tissue turnover at two cutting times and varied heights. Cutting lower heights (2 and 6cm) showed sigmoid pattern curve significant for leaves net growth dynamics, and cutting taller heights (10 and 14cm) appeared mainly parabola equation, but cutting again were also sigmoid regulation. The NHA increased according to sigmoid currve regulation on varied cutting treatments. Leaves net growth rate showed that taller cutting heights are higher than lower, then lower are higher than taller increasingly. NHA rate appeared that lower cutting are higher than taller and early treatment had more accelerated NHA rate than that of late in first cutting. Taller cutting height were more higher NHA rate than lower in second cutting and late treatments had more changeability than early.更多还原