摘要
研究烤烟地上部氮积累量与冠层光谱参数的定量关系,构建基于多种光谱指数的烤烟地上部氮积累量的监测模型。针对不同施氮水平下烤烟进行大田试验,于不同生育时期采集田间冠层光谱数据并测定植株不同器官及叶层生物量和氮含量。对烤烟地上部氮素积累量与多个光谱参数进行相关分析,研究结果表明:植株各器官氮积累量随着施氮水平的提高而增加,且施氮水平过低或过高都会促使氮素由烤烟叶片向茎和根转移。地上部氮素积累量与460-710 nm波段植株冠层光谱反射率呈极显著负相关(P<0.05),与760-1300 nm波段光谱反射率呈极显著正相关(P<0.05)。叶氮素积累与地上部氮素积累之间存在显著的定量关系,建立了光谱参数与地上部氮积累量间定量方程,确立了基于光谱参数的烤烟地上部氮积累量监测模型。经检验表明,利用光谱参数RVI(680,810)、DVI(680,810)、NDVI(680,810)、EVI_(810)、SAVI及OSAVI都能建立较好的地上部氮素积累量回归模型,预测精度R~2分别为0.901、0.792、0.839、0.929、0.921、0.930,回归剩余残差RMSE分别为0.264、0.245、0.193、0.188、0.202、0.260;基于红边特征参数分析,构造红边振幅与烤烟植株地上部氮素积累量的回归方程y=8.376x~(2.0901)经检验分析的RMSE为0.197,也具有较好的反演效果。利用关键特征光谱参数可以有效地评价烤烟地上部氮素积累状况,其中以植被指数EVI810和OSAVI及红边振幅的效果更好。
引文
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