Development a soybean crop model to support production under converted lowland paddies

本研究试图建立一个大豆作物模型，用于预测土壤水分过剩条件下的作物生产性能。在先前发表的模型（Sinclair, 1986）中，加入了一个发展阶段模块。为了建立作物对过量水分响应的模型，进行了两个系列的对照试验。一是测定土壤温度和氧化还原电位对涝渍对固氮的影响。另一个是叶片对过量水分的生长响应，揭示了不同温度条件下叶片生长响应的共同模式。利用地下水位控制系统在田间进行了田间试验，并编制了作物生物量、氮素积累和种子产量响应的数据集。对田间试验数据应用了一个初步模型，该模型解释了过量水分导致叶面积发育减少的原因。

This study attempted to develop a crop model for soybean that can be applied to predict crop performance under excess soil moisture condition. To a previously published model (Sinclair, 1986), a module of developmental stages was incorporated. For developing a module of crop response to excess water, two series of controlled experiments were conducted. One was for determination of N fixation response to waterlogging as affected by soil temperature and redox potential. Another was for leaf-growth response to excess water that revealed a common pattern of the leaf-growth response under varied temperature condition. The field experiments conducted on a field facilitated with the system for controlling underground water level and a data-set of crop responses in biomass and N accumulation and seed yield was developed. A preliminary model that accounts for reduction of leaf area development due to excess water was applied to the data from the field experiments.