一、前言多年生牧草的地下器官是贮存可塑性物质的仓库。可塑性物质与牧草的生长发育,特别是与多年生牧草的越冬、萌发和再生有着直接的关系,牧草生活力的强弱可以迅速明确地体现在可塑性质的多寡上,它是评定草原利用程度的指标之一。因此,对此课题的研究具有理论和实践的意义。综观现有文献资料,国外报导的以栽培牧草居多。国内对野生牧草进行可塑性物质 I. INTRODUCTION The underground organs of perennial grasses are warehouses that store plasticity. Plasticity and pasture growth and development, especially with perennial pasture overwintering, germination and regeneration are directly related to the strength of forage grass can be quickly and clearly reflected in the amount of plasticity, it is to assess the degree of grassland utilization index one. Therefore, the research on this topic has theoretical and practical significance. Looking at the existing literature, the majority of cultivated pastures reported abroad. Domestic forage for the wild plastic material