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棉花学报  2013 

基于光谱红边参数的棉花黄萎病叶片氮素含量诊断研究

DOI: 1002-7807(2013)03-0254-08, PP. 254-261

Keywords: 棉花,黄萎病,胁迫,高光谱,红边参数,氮素含量,诊断模型

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Abstract:

以黄萎病胁迫下棉花叶片为供试材料,分析了黄萎病棉叶氮素含量(LNC)与光谱红边参数间的关系,建立了黄萎病棉叶LNC(Leafnitrogencontent)的光谱红边参数诊断模型。结果表明(1)随着黄萎病严重程度的增加,棉叶LNC逐渐减小,且差异显著;(2)黄萎病棉叶红边参数红边位置(REP)、红边振幅(Dr)、红谷位置(Lo)、红边深度(Depth672)和红边面积(Area672)均减小,红边宽度(Lwidth)增加,且Area672的值减小的幅度最大,Dr减小的幅度最小,Lwidth的值增加的幅度较大;(3)黄萎病棉叶LNC含量均与红边参数REP、Lo、Depth672和Area672呈极显著正相关,与Lwidth呈极显著负相关,与Dr未达显著相关;(4)基于红边参数建立的黄萎病棉叶LNC含量的诊断模型均达到极显著水平(P<0.01),其中以Area672为自变量建立的黄萎病棉叶LNC的诊断模型的精度最高,R2超过0.7,RMSE小于0.6,RE小于0.007,能很好地诊断黄萎病棉叶LNC。

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