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

林人财; 陈鹤; 韩娜娜; 魏征; 李益农

引用本文:	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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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
林人财¹, 陈鹤¹, 韩娜娜², 魏征¹, 李益农¹
1.中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;2.天津农学院水利工程学院

摘要:

摘要：【目的】对河套灌区玉米生育期氮素浓度快速诊断并进行氮素风险评估，为施肥决策及农业面源污染朔源研究提供参考。【方法】基于无人机多光谱数据和实测氮素浓度，使用多种植被指数用于定量表征玉米植株氮素浓度，建立灌区玉米生育期氮素浓度诊断模型。根据诊断模型验证结果，对不同生育期内的植被指数诊断模型进行评价，得到临界氮浓度，并对玉米生育期进行氮素风险评估。【结果】河套灌区玉米拔节期、小喇叭口期、大喇叭口期和花粒期分别以GBNDVI、RVI、NRI和NDVI建立的氮素浓度诊断模型为最优模型；2020年灌区玉米的种植面积为412.78万亩，小喇叭口期和花粒期氮素浓度较低，拔节期和大喇叭口期氮素浓度较高；2020年灌区玉米氮素风险主要发生在拔节期和大喇叭口期，小喇叭口期存在少量Ⅳ级风险区，花粒期不存在氮素风险。【结论】根据玉米植株氮素浓度诊断模型得到的氮素浓度值，获得以灌溉单元为基础的氮素风险等级分布图，可为施肥决策和农业面源污染朔源研究提供参考。

关键词: 氮素浓度;玉米;遥感;风险评估;河套灌区

DOI：

分类号:S271

基金项目:一湖两海地区农牧业高效节水与面源污染防控技术

Diagnosis and Risk Assessment of Maize Plant Nitrogen Concentration in the Hetao Irrigation District Based on Multi-source Remote Sensing

LIN Rencai¹, CHEN He¹, HAN Nana², WEI Zheng¹, LI Yinong¹

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

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