Abstract
A distribution of extractive substances by height on the trunk and radius of the wood of the Siberian larch (Larix sibirica Ledeb.) was investigated. The maximum flavonoid content in terms of dihydroquercetin (the main flavonoid of the larch wood) was shown to be in the butt part of the tree. In the radial direction, this parameter increased from the center to periphery of the heartwood and reached the maximum value at the sapwood boundary. The maximum content of arabinogalactan (AG) was observed in the bottom and in the top of the trunk. The distribution of the extractive substances was studied in roots of the Siberian larch for the first time.
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