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FACE对水稻磷素累积量及含磷率影响的模拟研究

Keywords: 水稻,FACE,P素累积量,含P率,模型

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Abstract:

为了明确开放式空气CO2浓度增高(FACE)对水稻磷素动态的影响,借助目前国内惟一的FACE技术平台,以武香粳14为供试品种,设置不同施N量处理,研究大气CO2浓度高于对照200μmol·mol-1的FACE处理对水稻P素吸收利用动态的影响。结果表明,FACE处理使水稻各生育期P素累积量较CK显著增加,含P率也有所增加,但增幅不大。增施N肥对P素累积量及含P率均影响不大。在此基础上采用Logistic方程描述了水稻P素累积量及含P率随移栽天数的动态变化过程,并建立CO2及P素影响因子对模型进行了订正。利用建模以外的试验数据对该模型进行了检验,结果表明,模拟值与实测值之间的根均方差(RMSE)较小,相关系数达到了显著或极显著水平,表明模型的预测性能好。

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