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为了明确开放式空气CO2浓度增高(FACE)对水稻氮素动态的影响,借助目前我国惟一的FACE技术平台,以武香粳14为供试品种,设置不同施N量处理,研究了大气CO2浓度比对照高200μmol.mL-1的FACE处理对水稻N素吸收利用动态的影响。结果表明,FACE处理使水稻各生育期N素累积量增加,而使含N率下降;增施N肥使FACE及CK条件下的N素累积量均有不同程度的增加。在此基础上建立了相应的模拟模型,模型以时间为驱动因子,描述了水稻N素累积量及含N率随移栽天数的动态变化过程,对CO2浓度增加及常规条件下水稻N素的动态变化均有很好的拟合性。通过不同年份试验数据对模型的检验,结果表明模型的预测性能好,具有很好的适用性。
In order to clarify the effect of FACE on the nitrogen dynamics of rice, using the only FACE technology platform in our country, taking Wuxiangjing 14 as tested varieties, different N rates were applied to study the effect of atmospheric CO2 concentration The effect of FACE treatment 200 μmol · mL-1 higher than the control on the N uptake and utilization of rice. The results showed that FACE treatment increased the N accumulation in rice during the whole growth stages, but decreased the N content. Increasing N fertilizer increased N accumulation in FACE and CK to some extent. On this basis, a corresponding simulation model was established. Time-driven model was used to describe the dynamic process of nitrogen accumulation and nitrogen content in rice with transplanting days. The effects of CO2 concentration and N Dynamic changes have a good fit. The test of the model by the test data of different years shows that the model has good predictive performance and good applicability.