Abstract:

The potting Padus virginiana ‘Schubert’ was used as the plant material to explore the relationship between pigments, nitrogen content and spectral reflectance. A controlled release fertilizer was treated before the leaf discoloration. The spectral features of the leaves significantly changed after green leaves became purple. The reflection peak shifted right and reduced. The more anthocyanins content was, the more significant the reflection peak shifted. Correlation analysis demonstrated that at visible band 550-580 nm, the spectrum reflection had a significantly negative correlation with anthocyanins content. It could be used as sensitive band for monitoring the anthocyanins content in leaves of P. virginiana ‘Schubert’ by remote sensing. The correlation between spectrum reflection and nitrogen was consistent with the correlation between spectrum reflection and chlorophylls: at visible band 720-760 nm and near infrared 760-800 nm, the correlation between spectrum reflection and nitrogen & chlorophylls content was significantly positive. This spectral reflectance could be used to monitor the nitrogen and chlorophyll content in leaves by remote sensing.

Key words: controlled release fertilizer, Padus virginiana &lsquo, Schubert&rsquo, leaves, anthocyanins, spectral reflectances