樊泽华,河南农业大学农学院博士研究生,中国仿真学会农业建模与仿真专业委员会委员。曾于北京农业信息技术国家工程研究中心进行联合培养,获国家留学基金委资助,目前就读于国际玉米小麦改良中心(CIMMYT)。以第一作者身份在Computers and Electronics in Agriculture、《麦类作物学报》等刊物发表论文2篇;参与发表学术论文14篇。获得国家发明专利3项,软件著作权2项。作为负责人及主要成员参加“互联网+” “挑战杯”大学生创新创业大赛,获得省级奖项4项。
1.College of Agronomy/ State Key Laboratory of High-Efficiency Production of Wheat-Maize Double Cropping,Henan Agricultural University,Zhengzhou 450046,China
2.Bureau of Agriculture and Rural of Puyang City Nanle County,Puyang 457499,China
To develop effective approaches for estimating nitrogen pollution in farmland groundwater under different planting patterns in Henan Province, this study employed 210 farmland groundwater samples systematically collected from typical planting areas in Henan Province during 2022-2023 (169 samples from grain planting and 41 from vegetable planting). Based on Geographic Information System (GIS) technology, combined with correlation and path analysis, the effects of nitrogen application rate, precipitation, and well depth on groundwater nitrogen pollution were quantified. Multiple regression models were subsequently developed to estimate nitrate contamination in farmland groundwater. The results showed that:Nitrate nitrogen (NO₃⁻-N) was the primary pollutant in farmland groundwater. The exceedance rates in grain planting and vegetable planting areas were 1.02% and 30.03%, respectively. Path analysis identified nitrogen application rate as the core factor affecting nitrogen pollution, whereas well depth exerted an inhibitory effect. Precipitation exhibited contrasting effects between planting patterns, showing an inhibitory role in grain planting areas but a promoting effect in vegetable planting areas. The multiple regression estimation model exhibited accuracy in the calibration set, with R² values ranging from 0.62 to 0.72. Meanwhile, the validation set presented satisfactory model performance in the overall dataset and grain planting areas, with R² values of 0.41 and 0.53, respectively, indicating satisfactory predictive performance. In summary, the model can effectively quantify nitrogen pollution characteristics in farmland groundwater and is applicable to the assessment of nitrate nitrogen pollution in groundwater.
樊泽华,河南农业大学农学院博士研究生,中国仿真学会农业建模与仿真专业委员会委员。曾于北京农业信息技术国家工程研究中心进行联合培养,获国家留学基金委资助,目前就读于国际玉米小麦改良中心(CIMMYT)。以第一作者身份在Computers and Electronics in Agriculture、《麦类作物学报》等刊物发表论文2篇;参与发表学术论文14篇。获得国家发明专利3项,软件著作权2项。作为负责人及主要成员参加“互联网+” “挑战杯”大学生创新创业大赛,获得省级奖项4项。
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樊泽华,河南农业大学农学院博士研究生,中国仿真学会农业建模与仿真专业委员会委员。曾于北京农业信息技术国家工程研究中心进行联合培养,获国家留学基金委资助,目前就读于国际玉米小麦改良中心(CIMMYT)。以第一作者身份在Computers and Electronics in Agriculture、《麦类作物学报》等刊物发表论文2篇;参与发表学术论文14篇。获得国家发明专利3项,软件著作权2项。作为负责人及主要成员参加“互联网+” “挑战杯”大学生创新创业大赛,获得省级奖项4项。
模型精度评价指标主要采用决定系数(coefficient of determination,R2 )和相对预测偏差(ratio of performance to deviation,RPD)。其中,R2 越高,说明模型估算性能越好。RPD≥2.0表示模型结果可靠,2.0>RPD>1.4表示模型结果可行但准确性和稳定性有待提高,RPD≤1.4表明模型结果较差,数据不可靠。具体计算公式如下:
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