| 宁夏引黄灌区水稻冠层高光谱特征研究 |
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| 引用本文： | 李永梅,张立根,侯静,张学俭.宁夏引黄灌区水稻冠层高光谱特征研究[J].湖北农业科学,2016(7):1642-1645. |
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| 作者姓名： | 李永梅 张立根 侯静 张学俭 |
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| 作者单位： | 1. 宁夏农林科学院农业经济与信息技术研究所,银川,750002;2. 宁夏建筑科学研究院有限公司,银川,750021;3. 宁夏大学/西北土地退化与生态恢复省部共建国家重点实验室培育基地/西北退化生态系统恢复与重建教育部重点实验室/西部生态与生物资源开发联合研究中心,银川,750021;4. 宁夏农林科学院农业经济与信息技术研究所,银川 750002;宁夏大学/西北土地退化与生态恢复省部共建国家重点实验室培育基地/西北退化生态系统恢复与重建教育部重点实验室/西部生态与生物资源开发联合研究中心,银川 750021 |
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| 基金项目： | 宁夏自然科学基金资助项目(NZ14188)，宁夏农林科学院科技创新先导资金资助项目(NKYJ-14-16) |
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| 摘 要： | 以不同施氮量试验小区为依托,对各生育期水稻(Oryza sativa L.)冠层光谱反射率及一阶微分光谱进行分析。结果表明,水稻冠层光谱随生育期的变化规律与其生长发育变化特征相对应;不同施氮条件下水稻冠层光谱反射率随施氮量增加在可见光波段降低、近红外波段升高,其中550~600 nm和800~900nm处差异明显,是诊断氮素的特征波段;红边位置(λr)和红边斜率(Dr)在孕穗期前均随着氮素水平的提高而增加,齐穗期后λr出现蓝移现象,Dr减小;将特征波长的比值指数、λr和Dr与叶片氮积累量进行相关性分析,结果显示,800 nm和550 nm的反射率之比(R800 nm/R550 nm)与叶片氮积累量的相关性较好,其相关系数为0.864,λr和Dr与叶片氮积累量的相关系数分别为0.814、0.908。说明合适的光谱变量可以诊断水稻氮素状况,进而为合理施肥提供参考。
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| 关 键 词： | 水稻(Oryza sativa L.) 冠层 高光谱特征 宁夏引黄灌区 |
Study on Canopy Hyperspectral Characters of Rice in Yellow River Irrigated Paddy Field of Ningxia |
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| Abstract: | Based on experimental plot with different N application rate, spectral reflectance and the first order differential spectral data of rice canopy in each growth period were collected and analyzed. The results showed that the regularity of spectral of rice canopy with the change of growth period was coincide with the characteristics of its growth and development, canopy spectral reflectance of rice in visible band reduced with the increase of nitrogen application under different nitrogen conditions, but rose in the near infrared wave band, spectral difference from 550 nm to 600 nm, 800 nm to 900 nm was significant, which indicated that this two wavelength were the characteristic wavelength in the diagnosis of nitrogen. Red edge position(λr) and red edge slope(Dr) increased with the increase of nitrogen level before booting stage, and λr appeared "blue shift" and Dr decreased after full panicle stage. The correlations of ratio index, λr, Dr and leaf nitrogen accumulation were analyzed, the results showed that the correlation between R800 nm/R550 nm and leaf nitrogen accumulation was the better, its cor-relation coefficient was 0.864, and the correlation coefficient of λr, Dr were 0.814 and 0.908 respectively. It indicated that right spectral variables would be used to diagnose nitrogen for rice, thus provide reference for scientific fertilization. |
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| Keywords: | rice(Oryza sativa L ) canopy hyperspectral characteristics Ningxia Yellow river irrigated areas |
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