Botany lecture notes

Difference between Heartwood and Sapwood

Difference Duramen and Alburnum

Heartwood vs Sapwood
(Similarities and Differences between Heartwood and Sapwood)

Anatomically, wood is the secondary xylem of seed-plants. As the tree ages, certain permanent changes take place in the wood. The inner parts of the wood become darker. The xylem in this central part is called heartwood or ‘duramen’. The peripheral part of the wood is light coloured and it is called sapwood or ‘alburnum’. The sap conduction occurs through the sapwood.

The dark colour of heartwood is due to the accumulation many aromatic substances, pigments and tannins. These changes make the wood more strong and durable and resistant to decay by insect or fungal attacks. The inner heartwood provides the mechanical support.

The present post discusses the similarities and differences between heartwood and soft wood with a comparison table.

Similarities between Heartwood and Sapwood

Ø  Both are composed of secondary xylem formed after many years of secondary growth.

Ø  Both are derived from the vascular cambium.

Ø  Both can provide mechanical support.

Continue reading

Botany lecture notes

Difference between Hardwood and Softwood

Difference between Porous and Nonporous Wood

Hardwood vs Softwood
(Similarities and Differences between Soft Wood and Hard Wood)

Anatomically ‘wood’ is the secondary xylem of plants. Commercially there are two categories of wood based on its source. They are (1) Hardwood and (2) Softwood.

(1). Hardwood: The wood of dicot Angiosperms is called hardwood. Hardwood and heavy since it contains plenty of wood fibres (fibre tracheids and libriform fibres).

(2). Softwood: The wood of Gymnosperms is called softwood. The softwood mainly composed of tracheids and wood rays (parenchyma).

List of Hardwood trees: Teak, Rosewood, Mahogany, Oak, Sal-tree, Alnus, American chestnut etc.

List of Softwood trees: Araucaria (monkey puzzle tree), Cedar, Cypress, Fir (Abies), Pine (Pinus), Larch (Larix) etc.

The present post discuss the similarities and differences between Hardwood and Softwood with a Comparison Table

Similarities between Hardwood and Softwood

Ø  Both hardwood and softwood are secondary xylem.

Ø  Both contain tracheids and parenchyma.

Ø  Both are heavy and hard.

Ø  Both kinds of woods are economically valuable as timbers.

Difference between Softwood and hardwood

Difference between Hardwood and Softwood

Continue reading