Sapwood , or sapwood , or bloom , or undercrop - outer young, physiologically active layers of wood trunks , branches and roots [1] , adjacent to the educational tissue - cambium . Some sapwood cells contain spare substances.
The sapwood differs from the inner part (core) in a lighter color, less mechanical strength ; contains more water (active transport of water to the crown is carried along it) and is less resistant to damage by fungi and insects than the core and ripe wood.
Wood species such as birch and aspen do not form a kernel at all and their wood consists entirely of sapwood.
Due to the lower strength, the sapwood of some wood species, for example, oak , is not used in principle. However, in such breeds as, for example, cherry , the question of use is solved based on the visual characteristics of sapwood.
The most industrially important resin is deposited in sapwood - resin , which is extracted from pines by tapping (by cutting a bark with exposing the sapwood surface) [2] .
The young sapwood of some trees is good for human consumption. Pine sapwood was previously harvested in Siberia for food in large quantities, as evidenced by many authors, especially pre-revolutionary ones . Pine sapwood had a significant place in the diet, for example, of Yakuts [3] .
See also
- Blue wood
Notes
- ↑ Botanical and Pharmacognostic Dictionary: Ref. allowance / K. F. Blinova, N. A. Borisova, G. B. Gortinsky and others; Ed. K.F. Blinova, G.P. Yakovleva. - M .: Higher. school, 1990. - S. 59. - ISBN 5-06000085-0 .
- ↑ Based on materials from BES, dictionaries S. I. Ozhegov, D. N. Ushakov, T. F. Efremova, de.wikipedia.org
- ↑ Peoples of Russia - Yakuts