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Water-nitrogen Managements for Spring Maize at Tuquan, Inner Mongolia Based on APSIM
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摘要: 水分和氮肥是制约旱地农业生产的重要因素。基于2013—2022年内蒙古自治区突泉春玉米发育期、单产和田间管理数据, 对农业生产系统模型(agricultural production system simulator, APSIM)调参验证; 基于验证后的模型, 结合1981—2022年突泉气象数据, 设计不同水分亏缺程度下水氮管理情景, 以春玉米单产、水氮用量和效率为指标, 提出春玉米最优水氮管理措施, 并分析不同降水年型下春玉米适宜灌溉量和施氮量。结果表明: APSIM对春玉米出苗-开花日数、出苗-成熟日数和单产模拟值与实测值的归一化均方根误差分别为1.3%、1.2%和2.8%, APSIM可定量模拟春玉米发育期和单产。综合春玉米单产、灌溉量、施氮量、水分生产力和氮肥农学效率, 最优管理措施为0~100 cm土壤剖面深度下水分亏缺程度为60%时补充灌溉, 灌溉量为171.0 mm, 施氮量为197.8 kg·hm-2。当春玉米生长季降水量为200~400、401~600 mm和601~800 mm时, 适宜的灌溉量分别为233.0~283.5、110.5~148.4 mm和125.0~155.0 mm, 施氮量分别为176.9~219.3、218.3~241.5 kg·hm-2和211.8~249.9 kg·hm-2。Abstract: Water and nitrogen are critical factors that constrain the sustainable production of dryland agriculture. With increasingly severe crisis of water and nitrogen resources and environment, exploring and optimizing water-nitrogen managements, and hence achieving coordinated and unified resource conservation, high and stable grain production, and high efficiency are of great significance for agricultural development. Key parameters of APSIM (agricultural production system simulator) are calibrated and validated based on spring maize phenology, yield, and field management data from Tuquan, Inner Mongolia Autonomous Region from 2013 to 2022. Combined with meteorological data from 1981 to 2022 at Tuquan, water-nitrogen management scenarios are designed under different water deficit levels. Optimal water-nitrogen managements for spring maize at Tuquan are proposed based on indicators including spring maize yield, irrigation amount, nitrogen application amount, water productivity, and agronomic efficiency of applied nitrogen. Furthermore, the suitable irrigation and nitrogen application amounts for spring maize under different precipitation year types are analyzed. Results show that normalized root mean squared errors of the simulated and observed days from emergence to flowering, days from emergence to maturity, and yield of spring maize are 1.3%, 1.2% and 2.8%, respectively. APSIM can quantitatively simulate the growth period and yield of spring maize. Based on the principle that yield, water productivity, and agronomic efficiency of applied nitrogen of spring maize do not significantly decrease compared to the maximum values of all scenarios, and irrigation and nitrogen application amounts do not significantly increase compared to the minimum values of all scenarios, four management measures with no significant differences can be selected, namely, starting automatic irrigation when water deficit reaches 40%, 50%, 60% at the depth of 0-100 cm, and when the water deficit reaches 60% at the depth of 0-60 cm. Among them, the optimal auto-irrigation management for spring maize at Tuquan is to apply irrigation when the water deficit reaches 60% at the depth of 0-100 cm. In this scenario, the irrigation amount is 171.0 mm, and the nitrogen application amount is 197.8 kg·hm-2. When the precipitation during the spring maize growing season is 200-400 mm, the appropriate irrigation amount is 233.0-283.5 mm, and the nitrogen application amount is 176.9-219.3 kg·hm-2. When the precipitation during the spring maize growing season is 401-600 mm, the appropriate irrigation amount is 110.5-148.4 mm, and the nitrogen application amount is 218.3-241.5 kg·hm-2, respectively. When the precipitation during the spring maize growing season is 601-800 mm, the suitable irrigation amount is 125.0-155.0 mm, and the nitrogen application amount is 211.8-249.9 kg·hm-2. This study provides a quantitative reference for utilizing crop mechanism models in real-time monitoring, diagnosis, and precise management of crop water and nitrogen.
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图 1 —2022年内蒙古自治区突泉农业气象观测站气候资源
Fig. 1 Climate resources at Tuquan Agrometeorological Observation Station of Inner Mongolia from 1981 to 2022
图 1 —2022年内蒙古自治区突泉农业气象观测站气候资源
Fig. 1 Climate resources at Tuquan Agrometeorological Observation Station of Inner Mongolia from 1981 to 2022
图 2 —2022年春玉米发育期日数和单产的模拟值与实测值比较
Fig. 2 Comparison and validation of simulated and observed growth duration and yield of spring maize from 2016 to 2022
图 2 —2022年春玉米发育期日数和单产的模拟值与实测值比较
Fig. 2 Comparison and validation of simulated and observed growth duration and yield of spring maize from 2016 to 2022
图 3 不同情景下春玉米平均单产和高稳系数
Fig. 3 Average yield and high stability coefficient of spring maize under different scenarios
图 3 不同情景下春玉米平均单产和高稳系数
Fig. 3 Average yield and high stability coefficient of spring maize under different scenarios
图 4 不同情景下春玉米水分生产力和氮肥农学效率
Fig. 4 Spring maize water productivity and agronomic efficiency of applied nitrogen under different scenarios
图 4 不同情景下春玉米水分生产力和氮肥农学效率
Fig. 4 Spring maize water productivity and agronomic efficiency of applied nitrogen under different scenarios
表 1 调整后APSIM关键参数值
Table 1 Specific values of APSIM key parameters after parameter adjustment
描述 单位 参数值 出苗到拔节期结束的有效积温 出苗到拔节期结束的有效积温>℃·d 出苗到拔节期结束的有效积温>210 孕穗期到开花的有效积温 ℃·d 10 开花到灌浆的有效积温 ℃·d 10 开花到成熟的有效积温 ℃·d 730 最适光周期 h 12.5 光周期最大临界值 h 24.0 光周期斜率 ℃·h-1 0.0 每株最大籽粒数 650 每平方米茎秆重 g 120 植株高度 mm 3000 
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表 1 调整后APSIM关键参数值
Table 1 Specific values of APSIM key parameters after parameter adjustment
描述 单位 参数值 出苗到拔节期结束的有效积温 出苗到拔节期结束的有效积温>℃·d 出苗到拔节期结束的有效积温>210 孕穗期到开花的有效积温 ℃·d 10 开花到灌浆的有效积温 ℃·d 10 开花到成熟的有效积温 ℃·d 730 最适光周期 h 12.5 光周期最大临界值 h 24.0 光周期斜率 ℃·h-1 0.0 每株最大籽粒数 650 每平方米茎秆重 g 120 植株高度 mm 3000
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表 2 不同情景下春玉米单产、水分生产力和氮肥农学效率的差异
Table 2 Variations in spring maize yield, water productivity and agronomic efficiency of applied nitrogen under different scenarios
土壤剖面深度/cm 土壤水分亏缺程度/% 单产/ (kg·hm-2) 高稳系数 灌溉量/ mm 施氮量/ (kg·hm-2) 水分生产力/ (kg·hm-2·mm-1) 氮肥农学效率/ (kg·kg-1) 0~200 10 13035.2 0.82 319.8 293.5 16.4 22.0 20 12343.3 0.77 219.3* 214.1* 18.2 26.2 30 11252.9 0.68 170.2* 189.5* 18.2 26.5 40 9807.3* 0.54 131.2* 154.8* 17.0 26.8* 50 8307.9* 0.39 94.1* 137.7* 15.5 24.6 60 6661.1* 0.22 58.3* 112.4* 13.1* 23.2 0~100 10 13230.2 0.83 358.3 317.8 15.7 19.8 20 13044.2 0.82 279.8* 279.3 17.4 22.7 30 12777.1 0.80 242.4* 247.1* 18.1 24.8* 40 12458.1 0.78 214.6* 224.7* 18.6 25.3* 50 12016.8 0.74 193.2* 217.2* 18.6 25.8* 60 11519.0 0.69 171.0* 197.8* 18.6 24.8* 0~60 10 13292.6 0.83 379.8 335.1 15.3 18.6 20 13122.6 0.82 301.5* 279.4* 16.9 22.3 30 12974.9 0.81 264.1* 262.4* 17.8 23.9* 40 12744.2 0.79 241.0* 249.7* 18.1* 24.7* 50 12483.6 0.77 218.8* 241.9* 18.4* 24.8* 60 12210.3 0.75 206.1* 226.6* 18.4* 24.2* 注：*表示与同一土壤剖面深度下土壤水分亏缺程度为10%情景的差异达到0.05显著性水平。
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表 2 不同情景下春玉米单产、水分生产力和氮肥农学效率的差异
Table 2 Variations in spring maize yield, water productivity and agronomic efficiency of applied nitrogen under different scenarios
土壤剖面深度/cm 土壤水分亏缺程度/% 单产/ (kg·hm-2) 高稳系数 灌溉量/ mm 施氮量/ (kg·hm-2) 水分生产力/ (kg·hm-2·mm-1) 氮肥农学效率/ (kg·kg-1) 0~200 10 13035.2 0.82 319.8 293.5 16.4 22.0 20 12343.3 0.77 219.3* 214.1* 18.2 26.2 30 11252.9 0.68 170.2* 189.5* 18.2 26.5 40 9807.3* 0.54 131.2* 154.8* 17.0 26.8* 50 8307.9* 0.39 94.1* 137.7* 15.5 24.6 60 6661.1* 0.22 58.3* 112.4* 13.1* 23.2 0~100 10 13230.2 0.83 358.3 317.8 15.7 19.8 20 13044.2 0.82 279.8* 279.3 17.4 22.7 30 12777.1 0.80 242.4* 247.1* 18.1 24.8* 40 12458.1 0.78 214.6* 224.7* 18.6 25.3* 50 12016.8 0.74 193.2* 217.2* 18.6 25.8* 60 11519.0 0.69 171.0* 197.8* 18.6 24.8* 0~60 10 13292.6 0.83 379.8 335.1 15.3 18.6 20 13122.6 0.82 301.5* 279.4* 16.9 22.3 30 12974.9 0.81 264.1* 262.4* 17.8 23.9* 40 12744.2 0.79 241.0* 249.7* 18.1* 24.7* 50 12483.6 0.77 218.8* 241.9* 18.4* 24.8* 60 12210.3 0.75 206.1* 226.6* 18.4* 24.2* 注：*表示与同一土壤剖面深度下土壤水分亏缺程度为10%情景的差异达到0.05显著性水平。
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表 3 最优管理措施下不同降水年型春玉米灌溉量(单位：mm)
Table 3 Irrigation amount of spring maize for different precipitation year types under optimal managements (unit: mm)
降水量/mm 0~100 cm土壤剖面深度 0~60 cm土壤剖面深度 水分亏缺程度为40% 水分亏缺程度为50% 水分亏缺程度为60% 水分亏缺程度为60% 200~400 283.5 261.0 233.0 279.0 401~600 148.4 126.8 110.5 137.4 601~800 155.0 145.0 125.0 130.0
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表 3 最优管理措施下不同降水年型春玉米灌溉量(单位：mm)
Table 3 Irrigation amount of spring maize for different precipitation year types under optimal managements (unit: mm)
降水量/mm 0~100 cm土壤剖面深度 0~60 cm土壤剖面深度 水分亏缺程度为40% 水分亏缺程度为50% 水分亏缺程度为60% 水分亏缺程度为60% 200~400 283.5 261.0 233.0 279.0 401~600 148.4 126.8 110.5 137.4 601~800 155.0 145.0 125.0 130.0
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表 4 最优管理措施下不同降水年型春玉米施氮量(单位：kg·hm-2)
Table 4 Nitrogen application amount of spring maize for different precipitation year types under optimal managements (unit: kg·hm-2)
降水量/mm 0~100 cm土壤剖面深度 0~60 cm土壤剖面深度为 水分亏缺程度40% 水分亏缺程度为50% 水分亏缺程度为60% 水分亏缺程度为60% 200~400 219.3 198.9 176.9 210.2 401~600 230.3 237.0 218.3 241.5 601~800 225.1 211.7 211.8 249.9
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表 4 最优管理措施下不同降水年型春玉米施氮量(单位：kg·hm-2)
Table 4 Nitrogen application amount of spring maize for different precipitation year types under optimal managements (unit: kg·hm-2)
降水量/mm 0~100 cm土壤剖面深度 0~60 cm土壤剖面深度为 水分亏缺程度40% 水分亏缺程度为50% 水分亏缺程度为60% 水分亏缺程度为60% 200~400 219.3 198.9 176.9 210.2 401~600 230.3 237.0 218.3 241.5 601~800 225.1 211.7 211.8 249.9
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