Technology andLivelihoodEducationAgriculturalArts

Dendrology the study of trees

Arboriculture • The study of cultivating trees and shrubs • Arboretum is a place where different kinds of

trees are exhibited.

Classification of Trees

Gymnosperms• Produces seeds without protective covering.

They are those also called soft wood.• Pines trees

Angiosperm• Flowering plants that produce seed. They are

called hardwood. Examples: Acacia, Nara

Uses of trees

Forest TreesSource of Timber Use to build houses. Reforestation

Fruit TreesProvides food

Med

icin

al T

rees

• Sources of substances that are used to treat some ailments

Medicinal Trees

Medicinal Trees

Banaba Tree

Orn

am

en

tal Tr

ees

For shadeFor beautification remedies

The Lumber Industry

Lumbering

• The process of bringing down trees in the forest.

• It is divided into two major activities• Cutting & Milling

CUTTINGFelling and cutting of trees into logs and

transporting into the mill

Milling• Logs are sewed into lumber and

seasoned until they are suitable for use.

May be seasoned by air or kiln drying to prevent it from wrapping and stop the growth of fungi and other insects.

Plywood

• Thin sheets of glued wood panels

with a top layer of veneer.

• Veneers are bound with glues or

plastic substances called

synthetic resins.

Laminated Wood• Made of two or more layers of wood bound

together by a synthetic resins

• Used as arches, church, airplanes and

bridges.

Fiber board

• A sheet made of vegetable. • Used as insulating material in buildings

Pterocarpus indicus

• It is a large deciduous tree growing to 30–40 m tall, with a trunk up to 2 m diameter. The leaves are 12–22 cm long, pinnate, with 5–11 leaflets, the girth is 12-34 m wide. The flowers are produced in panicles 6–13 cm long containing a few to numerous flowers; flowering is from February to May in the Philippines,The hardwood, which is purplish, is termite resistant and rose-scented.

• The flower is used as a honey source while leaf infusions are used as shampoos. Both flowers and leaves were said to be eaten. The leaves are supposedly good for waxing and polishing brass and copper. It is also a source of kino or resin