Type of wood preservation

. 1 . 2 end decay type

Wood damage caused by fungi can take many forms. The most serious can make the whole material collapse, put the wood

The material is broken down into relatively simple organics. Minor damage is caused by a little change caused by the side of the village

color. Both of these conditions will cause a certain degree of loss to the processing and utilization of wood.

It is generally believed that there are three types of wood decay; brown rot, hundred rot and soft rot. Brown rot and white rot are made by high true

Caused by the Basidiomycetes

Brown rot fungus destroys the whole cellulose of wood, and white rot fungus can metabolize whole fiber

It can also metabolize lignin. Soft rot fungi belong to the fungi of Ascomycetes and Deuteromycetes, invading cell wall

Cellulose in the texture. The macroscopic and microscopic properties of the decaying materials produced by these three kinds of decay are shown in the table.

The 4l

In addition to wood rot fungi causing brown rot, white rot and soft rot, some fungi invade wood.

The village makes it discolored. Some hyphae and deuteromycetes are concentrated in parenchyma, often

It is blue and gray. The hyphae of the color-changing bacteria of the village can also diffuse the bright pigment to make the surrounding wood

color.

The color change of the village caused by the color-changing bacteria of Biancun is various, mainly depending on the host and causing the change.

Colored creatures. Common discoloration is: red discoloration of red pine, red discoloration of feather leaf, green discoloration of eucalyptus, yellow discoloration of hardwood caused by Penicillium, brown discoloration caused by genus of genus. this

In addition, there are bacterial-induced discoloration and other types of discoloration. Common side village discoloration and its causes are listed in

table

4 . 2 .

table

4 . 2 common sapwood discoloration and causes

Discolored color	Name and various characteristics		Commonly occurring sapwood	General cause
Light blue black to basically iron grey; ordinary dark brown	The green is spotted, streaked or streaked, covering some or all of the edges; the mildew growth caused by fungi often appears on the surface of the discolored area, which can be deeply infested		Sawn timber and logs of almost all commercial timber species	Fungus
dark blue	Shovel discoloration, new cut trees, black spots or blister in contact with iron Shaped, oak lumber impregnated present process in iron; generally shallow contamination shadow		Elm, chestnut, American sweetgum and other products containing tannins	Chemical reaction between tannins and iron in wood
Light blue and brown	Chemical reaction of broadleaf wood The most common general internal discoloration is not visible until the surface of the sawn material is created; sometimes it only appears under the dry spacers, which can be deeply infested		Beech, eucalyptus, eucalyptus, eucalyptus, blueberry, and other hardwood sawn timber	Gasification of certain wood materials during gas or kiln
Light green brown to light green black	Mineral discoloration occurs in various sizes of lenticular stripes, or for general discoloration The chemical discoloration of persimmon trees is a general discoloration, which can be infected by deep people.		The living broad-leaved trees are mainly hard maple and persimmon trees.	The cause is unknown and may be caused by injury . During the drying period, some wood materials are exposed to air and oxidized.
Dark brown to gray	The exposed part of the weathered discolored wood has a general discoloration of the surface. Usually shallow infection After surface treatment or brushing , the surface of the moldy material continues to have a shallow discoloration, usually a shallow infection.	Sawn timber for all commercial timber species		The role of air, dust, rain and sunlight ("weathering") Catheter near the surface of the wood and mold fungus in the resin channel
Mottled, green, black	Mildew colored fungi appear. On the surface of the wood, it is generally easy to get rid of the surface, or to remove		All kinds of sawn timber for all kinds of commodity trees	Fungus
Mottled, brown or dim red	Dry discoloration usually appears as a simple color, such as a darkening of the color, which is essentially chemical discoloration, but generally harmless, and can be deeply invaded and dyed.		Broadleaf tree Material	Some wood objects when dry Qualitative oxidation
Grayish yellow, deep yellow	Bright color of fungus Usually appear as spots or small streaks, can be deeply infected		Sawn timber and logs of eucalyptus, birch, pecan and maple . Sawn timber and logs of Southern Pine and American Maple	Fungus

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