通过连续2年小区氮肥试验，在棉花不同生育期采集冠层高光谱数据并同步测定土壤氮含量，分析棉花冠层高光谱参数与土壤氮含量间的关系，建立基于植株冠层光谱的土壤氮含量估算模型。结果表明：土壤全氮含量随着施氮水平的增加而增加，且差异显著；基于棉花不同时期冠层光谱构建的14种光谱参量与土壤氮含量间的相关性有显著差异。其中，利用冠层光谱参数P_Area 1100、Depth 980、Area 672、PPR(550,540)建立的土壤氮含量监测模型分别在蕾期、花期、铃期、吐絮期4个关键生育期对土壤氮含量的预测均达到了较高的精度，能够很好地反映棉花土壤氮素营养状况。利用植株冠层光谱参数可以很好地监测土壤氮素营养，说明利用植株冠层光谱方法监测土壤氮含量是可行的。
Abstract
Through a 2-year community trial of nitrogen fertilizer in cotton, canopy hyperspectral data and synchronous determination of soil nitrogen content at different growth stages were obtained and the relationship between cotton canopy hyperspectral parameters and the soil nitrogen content was analyzed, soil nitrogen content estimation model based on hyperspectral parameter was established. The results showed that the nitrogen content increased with nitrogen level. The correlation between 14 kinds of selected parameters based on hyperspectral data of diffeled periods and plant nitrogen content was significantly different. The use of the soil nitrogen content model that established with spectral parameters P_Area 1100、Depth 980、Area 672、PPR(550,540) in four key developmental stages showed a higher prediction accuracy. It can be concluded that using spectra spectroscopic methods to monitor soil nitrogen content are feasible.
关键词
棉花 /
冠层光谱 /
土壤含氮量 /
高光谱参数
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Keywords
cotton /
canopy spectra /
soil nitrogen content /
hyperspectral parameters
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脚注
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基金
国家“863“计划（2006AA10A302、2006AA10Z207）,国家科技支撑计划（2007BAH12B02）和国家自然科学基金 （30860139）
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