环境因子有效性与春小麦生育期模型的建立

Effectiveness of the Environmental Factors and Growth Stage Model for Spring Wheat

研究指出：在影响春小麦生育期的众多环境因于中，温度是主导因子，其他环境因子的作用表现在对温度有效性的影响上。求出了各阶段的环境因子有效性系数，该系数能够综合定量地衡量环境因子对生育期的影响程度。提出了当量积温为环境因子有效性系数与活动积温乘积的概念。认为在环境因子不能满足的情况下，春小麦完成发育要求一定的当量积温。因春小麦不同生育阶段要求不同的环境条件，采用逐步订正法建立了生育期动态预报模型。该模型预报精度高。

Temperature is the leading factor and the other factors which affect spring wheat growth stage influence mainly the effectiveness of temperature. A concept of environmental factors effectiveness coefficient is raised, and the environmental factors effectiveness coefficient of every stage of spring wheat is worked out which can measure the extent of effect on growth stage. Based on the study above, another concept of equivalent accumulated temperature is suggested that equals the product of the accumulated temperature multiplied by the corresponding environmental factors effectiveness coeffient. also, a conclusion is drawn that spring wheat need certain amount of equivalent accumulated temperature to finish its development if its demand for environmental factors could not be met. Considering the different environmeantal condition requied in different growth stage, a growth stage dynamic prediction model is built by means of correcting step by step, and its prediction accuracy looks much higher.