Study on temporal and spatial variation of rice water production function
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摘要: 基于对水稻Jensen模型中敏感指数在全生育期变化规律的认识,以生长曲线函数建立了水稻敏感指数累积函数,分析了其特征,从而解决了不同长时段敏感指数转换计算问题。较全面地揭示了水稻水分生产函数及其敏感指数累积函数中主要参数随气象条件及土壤因子变化的规律。通过参照作物需水量及其频率以及不同地区土壤有效含水量为媒介,建立了对水分敏感指标在不同水文年份 (时间)和不同地区 (空间)进行预报的数学模型,据此提出了水稻水分生产函数在时、空两方面插补、延长、移用与扩展的理论与方法。借助于参照作物需水量等值线图及土壤分布图,探讨了绘制水分生产函数及其主要参数等值线图的原理和方法。Abstract: Based on the analysis of experimental data at Guilin Station for late rice,the models of water pro duction function (WPF) for rice and its regularity of temporal and spatial variation are studied in a systematical way.The key problem of use WPF is how to expand the water sensitivity index (WSI).Based on the regularity of the variation of WSI in the Jensen model for rice,the cumulative function of WSI with a growing curve is given out and the characteristics of this function are analyzed,so the problem of conversion WSI be tween different time step are solved.The regularity of the variation of water sensitivity indices with the climate and soil conditions are investigated,especially,the relationships between WSI,the reference evapo transpiration (ET0),and the available soil moisture are presented.Thus,the principle and methods for widening the ranges of time and space for applying the water production function of rice and the principle and methods for drawing the isogram of WSI based on the isogram of ET0 and the soil map are developed.
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