试验结果指出了苜蓿产量损失率与狗尾草密度之间的关系,建立了狗尾草生态经济阈值模型。计算结果表明,当杂草密度低于生态经济阈值时,不需要除杂,因此,明确杂草的生态经济阈值—杂草造成的净损失等于预防这种损失所耗费的成本时的杂草种群的大小,这对经济除杂,改良环境和维持人工草地生态平衡,具有重要的意义。 The results indicated that the relationship between loss rate of alfalfa and the density of Setaria viridis and the ecological economic threshold model of setaria viridis were established. The results show that when the density of weeds is lower than the eco-economic threshold, no impurity is needed. Therefore, it is clear that the ecological and economic threshold of weeds-the net loss caused by weeds is equal to the weed population at the cost of preventing this loss The size of this, the economic impurity, improve the environment and maintain the ecological balance of artificial grassland, is of great significance.