人工草地的种植规模和生产水平标志着一个国家或地区的畜牧业发达程度，而我国人工草地面积和生产水平与发达国家有很大差距，相关基础研究还十分薄弱。人工草地的建植方式主要有牧草单播和混播两种形式，而杂草对牧草产量和品质有重要的影响，当前人工草地杂草的生态防除日益成为栽培牧草生产和管理中急需攻克的难题。本项目拟在辽宁省西北部农牧交错区选用羊草和紫花苜蓿作为实验材料，通过除杂草和不除杂草处理，进行羊草和紫花苜蓿不同密度单播和不同空间配置方式混播的田间控制实验，揭示不同处理方式下牧草和杂草之间的竞争关系，阐明牧草密度和混播方式对牧草产量提高和杂草控制的影响机理，优化和构建高效的杂草生态防控模式，提高人工草地的生产性能，为优质、高产、绿色牧草生产提供科学依据。

The planting scale and the production level of artificial grassland indicate the developed degree of animal husbandry in a country or region. However, there is a big gap between the area and production level of artificial grassland in China and that of developed countries, and the related basic research is still very weak. Monocultures and mixtures are two main ways of planting artificial grassland. Weeds have an important impact on the yield and quality of artificial grassland. At present, the ecological control of weeds in artificial grassland has become an urgent problem in the production and management of artificial grassland. This project intends to select Leymus chinensis and Medicago sativa as planting materials in the agro-pastoral ecotone of Northwest Liaoning province. Through weed control and non-weed treatments, the project will perform the field control experiments of monocultures with different planting density and mixtures with different spatial pattern of L. chinensis and M. sativa. This study will reveal the competitive relationship between forage and weeds under different treatments, and clarify the mechanism of forage density and mixture pattern effect on forage yield and weeds suppression. The results will help to optimize and construct an efficient weed ecological control pattern, improve the production performance of artificial grassland, and provide scientific basis for great quality, high yield and green forage production.