基于CERES-Maize的黄淮平原夏玉米阶段缺水模拟分析

利用1991～2004年黄淮夏播玉米区8个试验站的气象、土壤、田间管理等基础数据对DSSAT 4.0中的CERES-Maize模型进行参数调整和检验。使用调参后的模型模拟黄淮夏播玉米区不同生育期缺水对玉米产量的影响。模拟结果表明，在营养生长阶段，拔节期为水分对玉米产量影响关键期；生殖生长阶段，灌浆期为水分关键期，其中灌浆前期水分对产量影响最大。7叶期和拔节期缺水时最大叶面积指数显著降低，阻碍植株干物质积累，茎叶干重显著降低；灌浆前期缺水穗粒数显著减少；灌浆中期缺水显著降低百粒重。

Simulation and Analysis of Water Shortage in Different Stages of Summer Maize in Huanghuai Region Based on the CERES-Maize Model

Based on meteorological data,soil data and field management data of 8 summer maize areas' observing stations in Huanghuai region from 1991 to 2004,the parameters of CERES-Maize model of DSSAT 4.0 were modified and localization tested.The effects of water shortage conditions in different growth stages on the final yield of summer maize in Huanghuai region were simulated with the validating model.The results showed that the jointing stage and the earlier milking stage were the moisture critical periods for maize growth in the vegetative growth stage and in the reproductive growth stage,respectively.In comparison,water shortage at the earlier milking stage had the greatest impact on the final yield of maize.The maximum leaf area index and the dry weight of stem and leaf of summer maize would be significantly reduced and the accumulation of dry matter above the ground would be hindered with the lack of water at seven leaves stage or jointing stage,while the grain number per spike and the kernel weight would be significantly reduced when the water shortage happened at earlier and middle milking stage.