The research analyzes observation materials and condition assessment of 100-year geographical Scots pine forest cultures created in 1913 by professor Ogievsky V D on drained lands of the Okhta forestry territory to study the intensity of Scots pine trees growth depending on the seeds origin. The planting material was grown from seeds collected in the northern, southern, eastern, southwestern and central parts of Russia. The growth of Scots pine cultures was studied and changes in wood stock, trees amount, annual increments, influence of meteorological factors on radial increments were analyzed depending on the origin of the planting material. The results of research show that sustainable and highly productive cultures can be grown from seeds of northern and eastern regions of Russia.
The research provides basic parameters of creating Scots Pine forest plantations on various elements of the mesorelief such as hill tops, slopes and tops of overburden banks, slight slopes (3-6°) of various exposures, depressions in the relief and the bottom of sand pits. It gives main taxation characteristics of 20-35 year old forest plantations. Study results show correlation between the growth of forest plantations and their positioning in the mesorelief and the characteristics of young sandy soil. It showed increased survival capacity of forest plantation on the poorest growing conditions. Weakly growing pine cultures are confined to habitats with a low content of organic matter in sandy soils (> 0.2-0.4%). The pine growth rate has a strong correlation with the nitrogen content in the soil, the sum of exchange bases, the fertility index. These indicators have small values, traces-with poor growth of cultures and just small values-with good growth of cultures. The attrition of cultures has more expression in highly productive forest plantations. The site index is to a certain extent related to the mesorelief of the area. Cultures of the highest site indexes classes (I-II) grow on the tops of overburden banks and hills, as well as in mixed plantings with yellow acacia. The forest plantations located at the bottoms of sandpits and decreases in a relief are characterized by slow growth. Generally, it was shown that the growth of pine on young sandy soils is limited by extremely small values of indicators of soil fertility (the content of organic matter, nitrogen, and physical clay). The best growth is observed on the tops of the hills and overburden banks, the average is on the slight slopes of different exposures, the worst is at the bottom of sandpits .
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