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覆膜旱作是节水稻作生产体系的重要措施之一,采用CERES-Rice模型模拟覆膜旱作水稻生长需另外考虑覆膜的增温效应和根系层土壤水分布差异及由此所带来的影响。该文借鉴部分旱地作物的相关研究成果,对原CERES-Rice模型中的积温和土壤温度、蒸发和土壤水分胁迫等模拟计算过程进行了改进,并进一步通过2个水稻生长季的田间试验予以验证。试验于2013、2014年在湖北房县进行,共涉及淹水(对照)、覆膜湿润栽培和覆膜旱作共3个水分处理,采用原模型和改进模型分别对2个生长季、2个覆膜处理的生育期、叶面积指数与地上部干物质质量的变化过程及产量进行模拟。结果表明:原CERES-Rice模型难以准确刻画覆膜旱作水稻的生长发育过程,经改进后,模拟效果大大改善,可有效反映环境变化(水分、温度)对覆膜水稻生育进程的影响和产量形成,维持生育期与产量模拟的相对误差在15%以内;覆膜水稻叶面积指数的动态模拟基本满足要求,其均方根差≤1.54 m~2/m~2、相对均方根差≤27%、建模效率≥0.85;对覆膜水稻地上部干物质质量变化过程的模拟也呈现出较好的效果,均方根差和相对均方根差分别小于1 490 kg/hm~2、16%,建模效率则高于0.95。总体而言,经改进后的CERES-Rice模型基本可满足要求,较好地用于模拟覆膜旱作水稻的生长发育规律。
Film mulching is one of the most important measures to save rice. The application of CERES-Rice model to simulate the effect of plastic film mulching on paddy rice growth requires additional consideration of the warming effect of mulching film and the difference of soil water distribution in the root system, Impact. Based on the related research results of some dryland crops, this paper improves the simulation calculation process of accumulated temperature and soil temperature, evaporation and soil water stress in the original CERES-Rice model and further verifies with field experiments in two rice growing seasons . The experiment was carried out in Fang County, Hubei Province in 2013 and 2014, involving a total of 3 treatments including flooding (control), plastic film mulching cultivation and plastic film mulching. Using the original model and the improved model, The growth process, the leaf area index and the dry matter mass change process and yield were simulated. The results show that the original CERES-Rice model can not accurately characterize the growth and development of dry-mulched rice. After the improvement, the simulation results are greatly improved, which can effectively reflect the effects of environmental changes (moisture and temperature) on the growth and development of mulched rice The relative error of the formation and maintenance of crop growth and yield was less than 15%. The dynamic simulation of the leaf area index of mulched rice basically met the requirement. The root mean square difference was less than or equal to 1.54 m ~ 2 / m ~ 2, 27% and modeling efficiency ≥0.85. Simulating the dry matter mass change of above-ground parts of mulched rice also showed good results. The root mean square error and relative root mean square error were less than 1 490 kg / hm ~ 2, 16%, modeling efficiency is higher than 0.95. Overall, the improved CERES-Rice model can basically meet the requirements, and is better used to simulate the growth and development of dryland rice with plastic film mulching.