Home – Home – Jornals – Contemporary Problems of Ecology 2008 number 6

Some indices of the individual variability of the annual growth of trees in the larch sparse growth of trees of Khakasia are compared. Under the conditions of Shira forest-steppe, larch is characterized by the high sensitivity of annual growth and a broad range of responses to changes in vegetation conditions. The advantage of the trees of medium growth sensitivity is maintained by the stabilizing selection. These trees are distinguished by the highest vitality. A direct connection of the adaptive norm of the reaction of the population and the individual variability of growth indices with the total annual amount of precipitation was revealed. The genetic structure of the population is depicted to a higher extent by the index of sensitivity of annual growth.