Abstract: In the winter of southwestern China,when the coolseason forages grow normally,the productivity of warm-season forages falls considerably.To establish a complementary forage system in the area,some 7 annual cool-season crops and forages were sown into a plot of Hemarthria compressa grassland in winter.The net photosynthesis(Pn) of triticale sown at different times was measured,the location and yield of different crops and forages were sought and rated,and the yearly density of the H.compressa grassland was gauged.The result shows that the photosynthesis of triticale is higher than that of H.compressa.The yield of triticale and of rye are respectively 28.9% and 26.0% higher than that of the control.There are no other significant differences between the control and the rest crops or forages in the complementary system.The final results show that the density and the yield of H.compressa in the complementary system are not remarkably distinct from those of the control.

Key words: Complementary forage system(CFS), Warm-season grassland, Supplement sowing in winter, Net photosynthesis(Pn), Yield, Density

摘要： 在扁穗牛鞭草(Hemarthria compressa)草地,秋季补播7种冷季型一年饲用生作物和牧草,建立互补系统。对不同时期补播的小黑麦(Triticale wittmack)进行净光合速率测定,对各处理全年产草量分布和扁穗牛鞭草密度变化进行测定。结果表明:小黑麦的净光合速率显著高于对照;补播小黑麦和黑麦(Secale cereale)的全年产草量与对照间差异显著,分别提高了28.9%和26.0%;其他处理与对照间差异不显著;扁穗牛鞭草密度和产草量与对照之间差异不显著。

关键词: 互补牧草系统, 暖季型草地, 冬季补播, 净光合速率, 产草量, 密度