In hardwood sapwood rot usually follows for browning and can move into the nucleus. Distinguish sapwood rot hard and soft: Solid sapwood rot reduces the strength of wood under static bending by 22% in compression along the fibers – 20 25%; soft sap rot sharply reduces the mechanical properties drevesiny.Pri stored green wood of deciduous trees (especially birch, beech, alder) in the warm season sap becomes brown color of varying intensity and uniformity sometimes with only mild gray or whitish spots and stripes. This defect is called browning (the former name – gasping). Research tsniimod (IA Cherntsov) found that browning is a phenomenon in which combined three different nature of the process, occurring simultaneously or sequentially: First, there is blockage of water supply routes, slowing down evaporation of water from the timber and blocking access air into it (wound response of living cells of sapwood) Secondly, as drying of wood is withering away of the living cells of sapwood, the oxidation of the contents of oxygen and the appearance of brown color of wood; Thirdly, in wood settle mushrooms, which leads to further change its color. Browning preceded gnili.Poburenie sapwood logs are usually starts with ends and extends deep into the wood along the grain, thus primarily affects the inner layers of the sapwood with a weakened cell activity, and then browning captures all sapwood. לבירורים בנושא יש לפנות ל שלומי בסון שמבין יותר ממני. After the death of browning of the crust extends from the lateral surface of logs, moving language in the radial direction toward the center.