| Cite this article: | 林人财,陈鹤,韩娜娜,等.基于多源卫星遥感的河套灌区玉米植株氮素浓度诊断及风险评估[J].灌溉排水学报,2022,():-. |
| LIN Rencai,CHEN He,HAN Nana,et al.基于多源卫星遥感的河套灌区玉米植株氮素浓度诊断及风险评估[J].灌溉排水学报,2022,():-. |
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| Diagnosis and Risk Assessment of Maize Plant Nitrogen Concentration in the Hetao Irrigation District Based on Multi-source Remote Sensing |
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LIN Rencai1, CHEN He1, HAN Nana2, WEI Zheng1, LI Yinong1
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1.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research;2.College of Water Conservancy Engineering, Tianjin Agricultural University
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| Abstract: |
| Abstract: 【Objective】The rapid diagnosis and risk assessment of nitrogen concentration in maize growth period in the Hetao Irrigation District were carried out to provide reference for fertilization decision and non-point source pollution research.【Method】Based on the UAV multi-spectral data and measured nitrogen concentration values, a variety of vegetation indices were used to quantitatively characterize plant nitrogen content, and a diagnostic model of nitrogen concentration during maize growth period was established. According to the validation results of vegetation index diagnostic models, the vegetation index diagnostic models in different growth periods were evaluated, the critical nitrogen concentration was given, and the nitrogen risk was assessed in growth period. 【Result】The optimal nitrogen diagnostic model was established by GBNDVI, RVI, NRI, and NDVI at jointing, small trumpet, large trumpet and flowering stage of maize in the Hetao Irrigation District, respectively. The planting area of maize in the Hetao Irrigation District in 2020 was 4.1278 million acres. The nitrogen concentration was lower in small trumpet and flowering stage, and higher in jointing and large trumpet stage. In 2020, the nitrogen risk of maize in the irrigated area mainly occurred in the jointing and the large trumpet stage. There were a few level IV risk areas in the small trumpet stage, and there was no nitrogen risk in the flowering stage. 【Conclusion】According to the nitrogen concentration value obtained by the nitrogen diagnosis model of maize plants, the nitrogen risk level map based on the irrigation unit is obtained, which can provide a reference for fertilization decision-making and research on the source of non-point source pollution. |
| Key words: nitrogen concentration; maize; remote sensing; risk assessment; the Hetao Iirrigation Ddistrict |
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