【摘要】 AquaCrop模型利用半定量的方法代替具体施肥量数据,该模型与遥感数据结合能有效减小区域施肥管理措施的空间差异性带来的模拟误差。利用盈科灌区2012-2013年田间试验数据对AquaCrop模型进行率定和验证,并对模拟结果进行了精度分析。结果表明:2012年和2013年土壤储水量模拟值和观测值的决定系数R~2分别达到0.83和0.89,RMSE均在合理范围内;冠层覆盖度模拟值和观测值的决定系数R~2均大于0.90,RMSE分别为7.50%和7.90%;地上干物质量模拟值和观测值的决定系数R~2分别为0.97和0.74。进一步利用该模型的半定量方法对作物生长指标在不同施肥水平情景下的生长状况进行模拟,量化了不同施肥水平下与肥胁迫状况相关的压力系数,为模型区域化应用奠定基础。更多还原

【Abstract】 AquaCrop model,with semi-quantitative method instead of specific fertilization,can effectively reduce the simulation errors caused by the spatial variability of regional fertilization management combining with remote sensing data. In this paper,AquaCrop model was calibrated and validated using field measurements of 2012 and 2013 and the simulation accuracy was analyzed. The results showed that R~2 of the simulated and observed values of soil water content reached 0. 83 and 0. 89,respectively,and that of the canopy coverage were both greater than 0.90. RMSE of the canopy coverage reached 7.50 and 7.90,respectively. In 2012,R~2 of the simulated and observed values of above ground biomass reached 0.97,and 0.74 in 2013. The semi-quantitative method of the model was further used to simulate the growth indexes of crop,and the coefficients related to fertilizer stress under different fertilization levels were quantified,which laid foundation for the regional application of the model.更多还原