| 摘要: |
| 为研究基于高光谱优化NDVI值在反演喇叭口期玉米叶片氮含量的可行性, 使用Fiedspec3.0光谱仪和Greenseeker分别对不同施氮量下玉米叶片的光谱反射率和NDVI进行了测定, 并对NDVI值进行了提取和优化, 建立玉米叶片氮含量优化NDVI反演模型, 对其反演精度进行验证。结果显示:优化NDVI值与NDVI测定值、玉米叶片氮含量均呈显著正相关(r=0.913 2, 0.949 8), 优化NDVI值对玉米叶片氮含量反演精度达到显著水平(r=0.908 1), 反演精度高于NDVI测定值。优化NDVI值能通过群体的速测来决策玉米叶片的氮含量, 为玉米进行氮营养诊断提供新的技术支持, 具有重要的现实意义。 |
| 关键词: 高光谱 NDVI 玉米 氮营养 |
| DOI：10.11841/j.issn.1007-4333.2014.06.08 |
| 投稿时间：2014-04-11 |
| 基金项目:吉林省科技厅重点项目(20120208);国家自然科学基金资助项目(40671124) |
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| NDVI value optimization and nitrogen content inversion of maize leaf based on the high spectrum |
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ZHAO Ming-jia, ZHANG Zhong-qing, LI Zhi-hong
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| (College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China) |
| Abstract: |
| The Field Spec 3.0 spectrometer and Greenseeker were used to measure spectral reflectance and NDVI respectively in maize leaf under different nitrogen rates.The NDVI was drew and optimized.The model was established for inverting the nitrogen content in maize leaf and then the inversion accuracy was verified.The purpose was to understand the feasibility of inverting nitrogen content of maize leaf at bell stage with the optimized NDVI value based on the high spectrum.The results showed that there was significant positive correlation between the optimized NDVI and measured NDVI and the nitrogen content of maize leaf (r=0.913 2*, 0.949 8*).The inversion accuracy of the optimized NDVI to the nitrogen content of maize leaf reached to a significant level (r=0.908 1*), and was higher than the measured NDVI.The optimized NDVI might determine the nitrogen content of maize leaf by speed measurement of group, and provide new technology support to nitrogen nutrition diagnosis for maize, which had important practical role. |
| Key words: high spectrum NDVI maize nitrogen nutrition |
