RZWQM2模型对河北坝上地区大白菜模拟适用性评价

为明析根区水质模型(RZWQM2)对河北坝上地区蔬菜作物的适用性,以该地区膜下滴灌大白菜为研究对象,建立模型运行的气象、土壤及作物数据库,模拟2018年和2019年大白菜生育期内田间土壤水分动态变化、作物株高变化及最终产量,并通过实测值进行对比分析。结果表明:①经过对该模型参数的校准,得到各土层(20 cm、40 cm及60 cm)土壤水分模拟结果RMSE(均方根误差)值位于1.00%~3.03%之间,d(一致性指数)值位于0.50~0.78之间;②在2018年和2019年,作物株高模拟结果RMSE值分别为0.87 cm和0.90 cm,d值均大于0.85,产量的d值达到了0.99和0.98。校准后的RZWQM2模型在河北坝上地区具有较好的适用性,可为该地区大白菜田间水分高效利用、不同灌溉制度等进一步相关研究奠定基础。

Applicability Assessment of RZWQM2 Model for Chinese Cabbage in Bashang Region of Hebei Province

In order to reveal the applicability of the Root Zone Water Quality Model(RZWQM2)for the simulation of the soil water content and growth of vegetable crops in the Bashang Area of Hebei Province,in this study,taking Chinese cabbage under drip irrigation under membrane as the research object,the databases of meteorological,soil and crop were established to simulate the dynamic changes of soil moisture,crop plant height and final yield during the growth period of Chinese cabbage in 2018 and 2019,and compared with the measured values.The results showed that:①after calibration of the model parameters,the RMSE(root mean square error)and d(consistency index)values of simulated soil water content of each soil layer(20 cm,40 cm and 60 cm)ranged from 1.00%to 3.03%and 0.50 to 0.78,respectively.②In 2018 and 2019,RMSE values of plant height simulation results were 0.87 cm and 0.90 cm,respectively,and d values were both greater than 0.85.The d values of yield reached 0.99 and 0.98.The calibrated RZWQM2 model has good applicability in Bashang Area of Hebei Province,which can lay a foundation for further researches on water efficient utilization and different irrigation systems for Chinese cabbage in this area.