ABSORPTIVE ACTIVITY OF ROOTS AND BIOLOGICAL PRODUCTIVITY OF SCOTCH PINE IN ONTOGENESIS IN THE URALS REGION
Complex transformation of forest inventory data of pine stands of the Urals region into physiological parameters at the level of organism in ontogenesis has been carried out. The main factor limiting the growth processes was the lack of mineral nutrients, being increased with the growth of plants, which led to reduced absorption activity of the roots and drop in net photosynthesis and biological productivity of forest stands. The growing shortage of minerals launched nonspecific adaptive response of plants which in response to stress increased the active roots surface with regard to the surface of needles. Hence, the above-ground pine parts were supplied more intensively with the elements needed for the maintenance of the vital photosynthesis and the biological productivity was stabilized after 60–70 years.