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The work has studied the peculiarities of renewal processes of vegetation on the lands left from the economic circulation in the conditions of North Vietnam and on the postagrogenous lands of the Leningrad region. The landscape features of the Cuc Phuong National Park and the Izhora Plateau are considered. The differences in the geographic location of the regions of the study make it possible to isolate the general patterns of the formation of vegetation on soils formed on limestone parent rocks against a contrasting background. The state of soils of former agricultural lands on carbonate parent rocks in the studied areas in different landscape locations is analyzed. There is a high level of fertility at the research sites formed as a result of the previous agricultural use of these lands. The study has been carried out on the species composition of vegetation for the considered regions. It is noted that species diversity of plant species is high, which is associated with increased fertility of these areas, formed as a result of previous use and carbonate parent rock in the studied regions. A comparative analysis of the processes of natural regeneration on the former agricultural lands on calcareous parent rocks shows that there is a successful renewal of native tree species in these territories regardless of the geographical location. These areas of postagrogenous lands are habitat for rare vegetation species for the studied regions.

COMPARATIVE CHARACTERISTICS OF SOIL CONDITIONS OF POSTAGROGENOUS LANDS AND PLANT COVER OF NORTH VIETNAM AND NORTH-WEST OF RUSSIA