基于稻田实测温度的水稻模型ORYZA2000应用

Application of Rice Model ORYZA2000 Based on Measured Temperature in Rice Fields

利用安徽省淮南市寿县水稻试验站2016-2018年水稻高温热害田间试验观测数据和气象数据,对ORYZA2000水稻模型进行本地化定标,再运用其对稻田实测温度和台站温度进行对比模拟研究,分析稻田不同高度的实际温度与台站温度的差别及其对ORYZA2000水稻模型模拟结果的影响。结果表明:(1)获取田间离地35、75、125cm处气温,并将各高度田间气温组合成稻田组合温度,代表田间水稻冠层的生境温度,将这4种温度及台站温度进行比较,在平均日最高温度方面,以稻田组合温度最高,高于台站温度近2.5℃;在平均日最低温度方面,田间各高度温度与台站温度相比差距相对较小。(2)本地化作物参数定标后,ORYZA2000水稻模型在模拟寿县水稻生育期和生物量方面精度较高,其中作物生育期及地面总生物量(WAGT)模拟精度最高。(3)在水稻产量模拟方面,利用稻田组合温度的产量模拟效果优于台站温度,稻田组合温度和台站温度模拟产量的NRMSE分别为4.2%和6.1%。研究表明,ORYZA2000水稻模型模拟中采用实际田间温度比采用气象台站温度更为合理,尤其在可能发生水稻高温热害时精度更高。

The data used in the model(such as temperature data)should be the actual environment data,however,most of the temperature data used in the previous crop model simulation studies are the observation temperature of local meteorological stations,i.e.the observation temperature in the shutter box,which is different from the actual air temperature in the rice field(at different heights).In order to study the difference between the actual temperature at different heights of the rice field and the station temperature and their effects on the simulation of the ORYZA2000 rice model,using the crop data and meteorological data from the 2016?2018 field trials of high thermal damage to rice at Shouxian Rice Test Station in Huainan City,Anhui Province,the ORYZA2000 rice model was calibrated locally,then the model was used to conduct comparative simulation research on the measured temperature in the rice field and the station temperature,at last,the differences between the actual temperature and the station temperature at different heights of rice field and their effects on the simulation results of ORYZA2000 rice model were analyzed.The research results show that:(1)the field air temperatures of 35,75,and 125cm over the ground were obtained,and the field air temperature of each height were combined into the rice field temperature(called combined temperature)according to the measured plant height of the rice(which can represent the habitat temperature of the rice canopy in the field).The four temperatures and the station temperature are compared with each other:in terms of the average daily maximum temperature,the combined temperature of the rice field is the highest,which is nearly 2.5℃higher than the station temperature;in terms of the average daily minimum temperature,the temperature gaps of each height in the field and the station temperature were relatively small.(2)After calibration of localized crop parameters,the ORYZA2000 rice model has higher accuracy in simulating rice growth period and dry biomass in Shouxian,and the simulation accuracy of crop growth period and total aboveground dry matter(WAGT)are very well.(3)In terms of rice yield simulation,the yield simulation effect using the rice field combined temperature is better than the station temperature,and the NRMSE of the rice field combined temperature and the station temperature simulated yield are 4.2%and 6.1%,respectively;research shows that using the actual field temperature in the ORYZA2000 rice model simulation is more reasonable than using the station temperature,especially when high thermal damage to rice is likely to occur.