only 10% of virgin forest left in us arkansas originally had 33.6 million acres of forest now 17.25...
TRANSCRIPT
TREE AND LEAF ID
TREE FACTS
Only 10% of virgin forest left in US
Arkansas originally had 33.6 million
acres of forest now 17.25 acres.
Arkansas’ first national forest est. 1909
OBJECTIVES
Identify parts of a tree.
Identify 2 main types of trees.
Identify different characteristics of leaves.
WHY?
Why do we need to know the parts of a tree?
Why is it important to be able to know the different types of trees?
Why do we need to know the different characteristics of leaves?
WHAT?
What are the parts of a tree?
What are the 2 main types of trees?
What are the different characteristics of leaves?
PARTS OF THE TREE
CROWN – FILTERS DUSK, CREATES SHADE (COOLING), FOOD FACTORY , RELEASES OXYGEN
ROOTS – ABSORB/STORES WATER AND NUTRIENTS, ANCHORAGE
TRUNK/STEM – SUPPORTS CROWN, AND GIVES TREE STRENGTH AND SUPPORT
HEARTWOOD – SUPPORT THE TREE (XYLEM CELLS BECOME INACTIVE AND DIE FORMING HEARTWOOD)
XYLEM/SAPWOOD – TISSUE THAT CARRIES WATER UP THE PLANT
CAMBIUM – THIN LAYER OF GROWING TISSUE B/W WOODY PART AND BARK. DIVISION OF CELLS RESULTS IN DIAMETER GROWTH.
PHLOEM (PART OF THE BARK) – CARRIES SAP FROM LEAVES TO REST OF TREE
BARK – DEAD PHLOEM CELLS THAT PROTECT THE TREES “ARMOR FOR THE TREE”
2 TYPES OF TREES
Coniferous- type of tree that does lose its leaves at different time of the year. (angiosperm)
Deciduous- type of tree will not lose its leaves or needles in the winter (gymnosperm)
Angiosperm- flowering plant
Gymnosperm- non-flowering plant
TREES ARE DIVIDED UP INTO 3 GROUPS 1. Broadleaf Trees – known for their autumn
color, bare branches in winter, and spring flowers, which can develop into fruit
2. Needle leaf Trees – have needlelike or scale like leaves and plain flowers that develop into cones. Most are evergreens.
3. Palms – with pandanus and lily trees, make up are group of mainly tropical trees. Most palms have huge leaves and no branches
BROADLEAF TREES
Long growing season Plentiful rainfall “Hardwood forest” EX: Ash, Aspen, Beech, Birch,
Cottonwood, Elm, Hackberry, Live Oak, Maple, Myrtle, Oak, Sweet gum, Willow
BROADLEAF TREES
NEEDLE LEAF TREES
Grow where there are long, cold winters Some needleleaf forests grow in
warmer areas = Southeastern U.S. “Softwood forests” EX: Pine, Cedar, Fir, Cypress, Juniper,
Spruce, Redwood
NEEDLE LEAF TREES
PALMS
Grow in warmer areas.
LEAF CHARACTERISTICS
Leaf arrangement
Leaf Margins
Leaf shape
Leaf venation
LEAF ARRANGEMENT
Opposite
Alternate
Whorled
LEAF MARGINS
Looking at the edge of the leaf
Serrated
Lobed
Smooth
LEAF SHAPES
Palmate
Linear
Cordate
Ovate
LEAF VENATION
The distribution or arrangement of a system of veins in a leaf.
Parallel
Palmate
Pinnate
TERMS
Blade/leaf- main photosynthesis organ of most plants.
Virgin forest- untouched forest usually old growth
Snag- standing dead trees Duff- blanket of twigs and needles left
after cutting Slash- limbs, treetops, and other waste
left after cutting
REVIEW
What are the parts of a tree?
What are the 2 main types of trees?
What are the different characteristics of leaves?