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The wood of 22 of the most common low resinous tree species were studied. The number of polyphenols in the wood of the studied species ranges from 23.6 to 1433.1 mg% (0.02-1.43%). The maximum number is noted in the wood of thorny blackthorn. As the wood of fruit species ages (over 3 years old), the content of polyphenols decreases. The content of organic acids in wood of tree species varied in the range of 0.21-1.08%. The leader in terms of their content was the common rowan tree. The amount of tannins and dyes in wood species ranged from 1.45 to 26.5% and was maximum in the tissues of thorny blackthorn. The tannin level in the tissues of the tree species was 0.83-20.8%. The highest tannin content was in the wood of the rowan tree. With the natural drying of wood of 20 species within 8 months in a ventilated room at an air temperature of 25° C, the moisture content of the wood decreases 1.4-3.83 times and is set at the level of hygroscopicity (11.47-35.6%). In the process of slow drying of wood species, organic acids are not destroyed in them, but are concentrated. The least hygroscopic is the wood of the walnut and pedunculate oak, the most hygroscopic is the wood of the heart-shaped linden.

Comparative content of biologically active substances in wood species of the north of the forest steppe on the example of Lipetsk region