parts of tree

Explain with a graphic the different parts of the tree? The tree has three main parts: leaves, branches, and roots. The upper part of the tree with the branches is called the crown. The roots are the part of the tree that grows underground. Leaves are the part of the crown of a tree.

These are the different parts of trunk
Explain them
-Growth rings:
Growth ring, in a cross section of the stem of a woody plant, the increment of wood added during a single growth period. In temperate regions the growth period is usually one year, in which case the growth ring may be called an annual ring.

-Bark:
The bark is on the outside of the tree so the really rough bit of the tree. Bark is normally used on playgrounds.

Sapwood: Sapwood is the new wood under the Cambium layer. It is often lighter in color than true wood or heartwood and it conducts water and mineral salts from the root system of the tree to the leaves.

Dead bark: Dead bark or outer bark is a layer of dead tissue that is a protection for the trunk and branches. It also helps to reduce water loss from the living cells of the tree. Some trees shed their dead bark each year while on others dead bark is reduced only by the weathering processes.

Live Bark: Live bark is a layer of living tissue under the dead bark. Food materials produced by the leaves are conducted through the live bark to the branches, trunk, and roots of the tree.

Cambium Layer: The Cambium layer is the layer of thin cells, invisible to the naked eye positioned inside the live bark. This layer of cells facilitates all growth in the thickness of the tree trunk. The Cambium grows wood cells on the inside and lives barks cells on the outside.

 

Heartwood: Heartwood is made up of cells that are actually dead. It provides the strength necessary to support the tree. Heartwood is formed by the blockage of the channels which conduct food materials. Blockage occurs as stored food materials are converted into tennis, resins, and other related substances. Heartwood is much more durable than sapwood.

The Pith: The pith is at the center of the tree and is a soft, pulpy zone that is usually about one centimeter in diameter. 

Give examples of timber used in NZ?

With over 30 species in stock choose the timber that suits your project. Quality is important to us, so we supply a comprehensive range of NZ natives such as Kauri, Rimu and Matai, and all the popular exotic species such as American Black Walnut, Cherry, American White Oak & American Hard Maple.

-Kauri
Agathis australis, commonly known by its Māori name kauri, is a coniferous tree of Araucariaceae in the genus Agathis, found north of 38°S in the northern districts of New Zealand's North Island.

-Matai
the mataī or black pine, is an endemic New Zealand coniferous tree that grows on the North Island and South Island. It also occurs on Stewart Island/Rakiura but is uncommon there.

-Rewarewa
Prumnopitys taxifolia, the mataī or black pine, is an endemic New Zealand coniferous tree that grows on the North Island and South Island. It also occurs on Stewart Island/Rakiura but is uncommon there.

-Rimu
Dacrydium cupressinum, commonly known as rimu, is a large evergreen coniferous tree endemic to the forests of New Zealand. It is a member of the southern conifer group, the podocarps.

Give an example of defects in timber?
Wind cracks.
Shakes.
Twisted fibers.
Upsets.
Rind galls.
Burls.
Water stain.
Chemical stain.