麦田泽漆生态经济阈值的研究

Research on The Ecological Economic Threshold of Euphorbia helioscopia L.in Wheat Field

麦田泽漆对小麦危害造成产量损失 ,通过试验得到麦田泽漆密度 (x)与小麦产量损失率 (y)之间为双曲线关系 ,即 :^y=x/(8.9920+0.0181x)。根据生态经济阈值的定义 ,建立了麦田泽漆的生态经济阈值模型 ,按目前淮北麦区的小麦产量、价格及除草成本、效果等 ,计算得出高、中、低产麦田泽漆的化学防除指标分别为30株/m2、40株/m2、65株/m2。

The result showed that the correlation between the density of Euphorbia helioscopia 1.in wheat field and the loss ratio of wheat yield was double curvilincar function:^y=x/(8.9920+0.0181x).According to the definition of ecological economic threshold,the authors set up ecological economic threshold model of Euphorbia helioscopia L.,in wheat field:x=(89920c+899.2F·E)/(P·V·E-181C-1081F·E)(individual/m2).Based on the yield and price of wheat and cost and effect of grass control indexes of Euphorbia helioscopia L.could be figured out :30,40,65 individual/m2 in high, middle and low yield of wheat field respcctivcly.