中文摘要：

根据试验资料,在系统分析棉花冠层叶面积时空分布规律的基础上,充分考虑叶面积空间垂直分布的异质性,以生育期内累积的每日相对热效应为预报因子,构建了棉花叶面积垂直分布和叶面积指数的动态模拟模型。利用不同年份不同播期的试验资料对模型进行了验证,累积叶面积指数L（z）的模拟结果与1∶1直线之间的R^2和均方根误差分别为0.969和0.257,叶面积指数LAI的模拟结果与1∶1直线之间的R^2和均方根误差分别为0.936和0.305。结果说明模型具有较好的预测性和实用性。模型的模拟结果可作为冠层结构参数,用于冠层辐射传输模型和光合作用模型。

英文摘要：

On the basis of analyzing the temporal and spatial distribution of leaf area in cotton canopy, a dynamic simulation model of leaf area vertical distribution and leaf area index in cotton canopy were developed by using the cumulative relative thermal effectiveness. The model was validated by the experimental data of different sowing dates and different years. The coefficient of determination （R^2） based on the 1 ： 1 line and the root mean square error between simulated and measured L（z） were 0.969 and 0. 257 respectively. The coefficient of determination （R^2） based on the 1 ： 1 line and the root mean square error between simulated and measured LAI were 0. 936 and 0. 305 respectively. It proved that simulation results of the model came very close to the actual values. The simulation results could be coupled into the radiation transfer model and photosynthesis model of cotton.