农田黑土玉米生长过程模拟研究

利用DSSAT模型中的CEHES—Maize模型，对东北黑土区5种基础肥力的农田黑土，通过空间移位置于相同气候条件下的玉米生产力进行模拟研究。结果表明，DSSAT模型能够准确地模拟东北5种基础肥力的黑土农田玉米全生育期的生长过程，在不施肥和施化肥两种条件下决定系数R^2均接近1；对不同年份不同处理玉米产量模拟分析得出，在不施肥条件下均方根误差RMSE为159．03，施化肥条件下均方根误差RMSE为160．1；对不同处理最大叶面积指数模拟分析得到模拟值与实测值差异不超过4％的结论。表明该模型在进行遗传属性参数校正后能够指导实际玉米生产。图2，表3，参15。

Modeling the Maize Growth Processes in Black Farmland

Five different fertility arable black soils were removed to a location. Maize growth processes and its productivities in the five soils under the same climatic condition were simulated by using DSSAT-CERES-Maize model. Results showed that DSSAT Model provided good simulations of maize growth processes in the five different fertility black soils of Northeast China. The regression coefficients R^2 between simulated and observed values under no fertilizer application and fertilizer application conditions were both close to 1 ; The RMSE of maize yield simulation in different years and treatments was 159.03 under no fertilizer application condition and 160.1 under fertilizer application, respectively; The difference between simulated values and observed values of the maximal leaf area index in different treatments was less than 4%. So DSSAT model was reasonable to simulate the actual maize production after the calibration of genetics coefficients.