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因为磷素重要的营养作用,其胁迫的存在影响冬小麦的正常生长。借助地面遥感仪器获取冬小麦在磷营养胁迫下的多个生育期里的冠层光谱数据并对其影响特征进行了分析。利用因子分析方法提取主因子与含有丰富信息的光谱变量,并结合极显著水平(0.01)的均值比较与检验过程考察了冬小麦冠层光谱,确定了对磷营养胁迫敏感的光谱波段:760nm,810nm和870nm与950nm,并在此基础上结合冬小麦对磷素的吸收利用特征选定了运用冠层光谱敏感波段反射率探测和区分磷营养胁迫的关键生育期:拔节期。结果同时表明,对冬小麦磷营养胁迫而言,近红外区间(760nm~1100nm)光谱反射特征的区分能力要强于可见光区。本文同时指出了研究与发展利用遥感技术进行营养胁迫监测的方法和着重点。
Because of the important nutrition effect of phosphorus, the existence of its stress affects the normal growth of winter wheat. The ground-based remote sensing instrument was used to obtain the canopy spectral data of winter wheat under different phosphorus stress and to analyze its characteristics. The factor analysis method was used to extract the main factors and the spectral variables with rich information. The canopy spectra of winter wheat were compared with the mean value of the significant level (0.01), and the spectral bands sensitive to phosphorus stress were determined: 760nm, 810nm And 870nm and 950nm. On the basis of this, combined with the absorption and utilization characteristics of phosphorus in winter wheat, the key growth period of phosphorus stress was detected and detected by canopy reflectance spectral reflectance: jointing stage. The results also showed that the spectral reflectance characteristics in the near infrared (760nm ~ 1100nm) were better than those in the visible region for the winter wheat P stress. At the same time, this paper points out the methods and focuses of researching and developing nutrition stress monitoring using remote sensing technology.