白三叶种间竞争与草地数量化管理指数的关系

采用封闭式环境因子梯度试验设计,运用相对竞争系数来评价白三叶与其它6种植物种之间的竞争能力,通过对白三叶人工草地各管理因子的数量化,分析了牧草种间竞争与管理指数的关系。研究表明,数量化管理指数是对草地管理因子标准化研究的有效方法;白三叶与其它种的竞争特征表现出白三叶的竞争能力明显弱于鸭茅,但强于黑麦草、绣线菊、芒、白茅和地榆;白三叶与其它种的竞争系数随管理指数的提高而减弱,其中白三叶与白茅的竞争指数随管理指数变化呈“凸型”减弱趋势,而白三叶与黑麦草、绣线菊、芒、白茅、地榆、鸭茅的种间竞争指数随管理指数变化呈“凹型”减弱趋势。

The relationship between inter-specific competition and quantification management index in Trifolium repens pasture

In this study of white clover pasture,an experiment was designed with closing environmental gradient factors,and a management index of pasture was taken to quantify and standardize each management factor.The relative competitive coefficient(RCC) was used to compare the competitive ability of various pasture species,and to analyze the relationship between the inter-specific competition of pasture and management indices.The results showed that quantitative management indices were effective for research on standardization of pasture management factors;The competitive ability of white clover(Trifolium repens) was weaker than that of Dactylis glomerata,but stronger than those of ryegrass(Lolium perenne),Spiraea canescens var.nepalensis,Miscanthus sinensis,Imperata cylindrical and Sanguisorba officinalis.The competitive ability of white clover was decreased when management indices were enhanced.The RCC of white clover vs.Dactylis glomerata changed with the management indices and showed an initial increase to a plateau followed by a decrease as management indices decreased.The RCC of white clover vs.each of the other five species showed the opposite trend as management indices increased.