刈割方式对扁穗牛鞭草与白三叶混播草地竞争的研究

试验对扁穗牛鞭草和白三叶混播草地在不同刈割方式下草地群落的密度组成变化、不同层次生物量和相对竞争强度进行了研究。结果表明：扁穗牛鞭草种群密度受留茬高度影响显著,对草层高度不明显,刈割时的草层高度30cm和留茬高度10cm的刈割方式对扁穗牛鞭草有利,此时相对竞争强度较低,扁穗牛鞭草的竞争能力较高,由于白三叶前期生长迅速,占据了地面的空间抑制了扁穗牛鞭草的生长,扁穗牛鞭草草层结构一直处于一种不稳定的状态,最终被排挤出系统。

Effect of Cutting Patterns on Competition between Hemarthria compressa and White Clover in Mixture

The experiment about density change,biomass of different hiberarchy and relative competitive intensity(RCI) of Hemarthria compressa and white clover mixture grassland under different cutting frequency was conducted in sub-tropic.The result showed that the density of Hemarthria compressa is significantly influenced by stubble height,not cutting height.30cm in cutting height and 10cm in stubble benefit to Hemarthria compressa,at this movement RCI is low,competitive ability of Hemarthria compressa is strong.Because of white clover's rampant growth beginning,growth of Hemarthria compressa is significantly restrained.Hiberarchy of mixture Hemarthria compressawas always in an unstable condition,at last die out.