冬小麦红边参数变化规律及其营养诊断

The Red Edge Parameters Diversification Disciplinarian and Its Application for Nutrition Diagnosis

研究了冬小麦冠层光谱红边参数随作物生育期的变化规律,并进行了红边参数与各组分间的相关分析,发现可利用用红边位置反演叶片可溶性糖和叶绿素含量,利用红边振幅反演叶片全氮含量,利用红谷反演叶面积指数。建立了基于红边参数的各组分的统计回归模型,可为生产上利用遥感手段大面积、无破坏、及时评价冬小麦生长状态及营养诊断提供重要依据。

Red edge refers to the abrupt change of canopy reflectance in the spectrum band of 680~750nm,it is formed by strong absorption of red band and strong reflection of NIR band by pant canopy. The dynamics of red edge parameters (REP) for phenological stages of wheat canopy are studied, it indicated that the winter wheat growth dynamic can be evaluated by the red edge parameters with the study on the red edge parameters diversification disciplinarian. The red edge position moved to the longer wavelength from erecting stage to heading stage, and returned to the original wavelength direction from grain\|filling stage to maturity stage. The correlation analysis of REP and the components was also discussed. The red edge position can be used to predict the soluble sugar and the chlorophyll concentration; the red edge swing for the inversion of total nitrogen content; the near\|infrared platform for starch; the red vale for the leaf area index and the regression equation was also established. For this purpose red edge parameters can play a vital role in providing time\|specific and time\|critical information for precision farming.