The aim of the present research was estimation of features and changes in the spectral reflectance characteristics of Quercus robur L. leaves in the park-monument of horticultural art of national significance "Feofaniya" (the city of Kyiv, Ukraine) for evaluation of oak plantation state.

Areas of oak plantations affected by phytopathogens increase every year, and the damage leads to a decrease of the photosynthetic surface, decoloration, drying of leaves, defoliation, and finally to death of trees.

Spectral reflectance characteristics of Q. robur leaves were measured with a field portable spectroradiometer ASD FieldSpec® 3FR (USA), with a working spectral range from 350 to 2500 nm.

Statistical analysis of the spectral reflectance characteristics of the leaves demonstrated their close relationship with the level of damage by phytopathogens. The correlations between the change in the parameters of the spectral reflectance, the values of the vegetation indices (NDVI, SR, mSR705) and the indicators of phytopathogenic damage of Q. robur leaves during the growing season were established.

The analysis of spectral changes in leaves of Q. robur according to the values of vegetation indices characterizing the general physiological and stress state of trees showed that the trees under study are divided into three groups depending on the degree of physiological state and pest damage.

The conducted research revealed a clear trend of changes in spectrophotometric indicators of Q. robur leaves depending on damage by phytopathogens, man-made pollution and recreational load, and is an important component of estimating of park ecosystems state. It was determined that the methods of remote sensing for this assessment are promising and recommended for wide use in the environmental monitoring system due to a number of advantages.