Secondary successions on the lands from under agricultural use on the Kenozersky national park territory

Studying of secondary successions on the lands from under agricultural use was an actual, low-studied subject for the region. The materials of the researches conducted earlier testify that after the termination of use on purpose agricultural grounds are filled with wood and shrubby vegetation. The structure of the formed young growths depends on a number of factors: forest vegetation zone (subband); the type of agricultural use, the area of a site, the type of soils, remoteness from a wood wall, taxation indicators of the forest stands growing nearby. A research objective was studying of pro-cess of emergence of wood and shrubby vegeta-tion on the lands from under agricultural use on the territory of the Kenozersky National Park located on the territory of Arkhangelsk region in a middle subband of the taiga. At making of trial sites the method of circular platforms of constant radius was used. At cameral processing the methods of statis-tical processing, including correlation coefficient were used. By the results of researches it was re-vealed that the number of wood plants was low, their average height fluctuated from 1.09 to 3.33 m. The occurrence on breeds was as follows: the birch was for 100 % of the trial squares, an alder gray was 100, a pine was on 83 and a fir-tree was only for 67 %. It was noted that overgrowing was influ-enced by the type of agricultural ground, mechani-cal structure and degree of soil turfing. Arable lands grow mainly with alder sulfur and pines. Haymakings and pastures were represented by pines. The sandy loam soil was optimum for the development of a pine, a fir-tree and an alder gray, the birch had the greatest number on sandy soils. The number of young growth of all breeds on mid-dle turf ash soils considerably exceeded young the growth number on heavy turf ash soils.