The article presents the current state of populations, morphological, biochemical (antioxidants) and form diversity of Hippophae rhamnoides L., Berberis integerrima Bunge and Crataegus pseudoheterophylla subsp. turkestanica (Pojark.) K. I. Chr. in the territory of the Zarafshan National Nature Park (Republic of Uzbekistan). Against the background of increasing anthropogenic impact, a decrease in the number and density of individuals in the population, incompleteness of age spectra with the absence of pregenerative (seedlings, juvenile, immature), generative (young and old generative) and senile fractions, a shift in the sexual structure towards the predominance of males were established. A significant decrease in the diversity of H. rhamnoides forms is shown by combining the qualitative and quantitative morphological features of vegetative and reproductive organs, organoleptic properties and antioxidant activity. Two studied forms of B. integerrima were distinguished. All samples of juices from the fruits of Hippophae rhamnoides, B. integerrima and C. pseudoheterophylla subsp. turkestanica exhibits antioxidant properties and reduces the model substrate's oxidation rate by 2-5 times. The morphological forms of B. integerrima and H. rhamnoides differ in antioxidant activity. Among the forms of H. rhamnoides, samples 4, 5 and 6 have relatively high antioxidant properties. Form No. 2 of B. integerrima demonstrates the high antioxidant properties of the juice from the fruits. Among the studied species, the juice from the fruits of C. pseudoheterophylla subsp. turkestanica has relatively high antioxidant properties.