Lecture Notes3

Woodlands plantations have high woodlands biodiversity

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lenticils: • gas exchange. gas First cork cambium forms during 1st season. First • Subsequent cork cambia may develop in older 2o phloem. • Result: external patterns on older bark (p.625). Alligator juniper Shagbark hickory Focus Plant 4: Periderm Quercus Suber (Cork oak) p. 626 626 Mediterranean: Portugal, Spain, etc. • woodlands & plantations have high woodlands biodiversity. • Trees Live for 100’s of years. Sustainable harvest of outer bark every 10yr. • Chief product: Wine corks. • The enemy: Plastic corks; Currently The 20% of market. 20% • Oak woodlands threatened by Oak conversion to other uses. conversion Harvest Cork Leaves & Fruit Cork oak w oodland Bark & Wood (p. 620; 587) Wood: Inside of vascular cambium. • Wood usually the main economic forest product. * Bark: Outside of vascular cambium. • Inner bark: Functional 2o phloem, active cork cambium, & phelloderm. • Outer bark: Outside of active cork cambium; old periderms & old 2o phloem. Bark Wood * F.Y.I.: See interesting supplemental slide at end of presentation for descriptions of economic uses of various types of wood. External Features of Winter Twigs (After 1-2 Seasons Secondary Growth) p. 624; 589 • • • • • • • Terminal bud. Lateral (axillary) buds. Lateral Leaf scars. Leaf Vascular bundle scars. Vascular Lenticels. Lenticels. Nodes & internodes. Bud scale scars. Chapter 25 Part 2: The Leaf External leaf features (p. 592-593; 560-561) Two parts: Blade. Leaf stalk = Petiole. Leaves may have a sheath. Leaves may lack a petiole: = sessile. Sessile leaf with sheath Arrangement of Leaves on Stem (Phyllotaxy) (p. 590-591; 559-561). Alternate (includes both spiral & Alternate distichous) distichous) Opposite Whorled Basal Leaf Blade Complexity (p. 593; 559-561) Simple: one blade. Simple: Compound: blade completely separated into Compound: leaflets. • Palmately compound. Palmately • Pinnately compound. Pinnately • Bipinnately compound. Bipinnately Rachis: Axis of pinnately (or bi) compound leaf. leaf. Simple Rachis Palmately compound. Pinnately compound. Bipinnately compound. Leaf Venation: (branching pattern of veins in a leaf). Parallel venation: (most monocots), Pinnate venation: Palmate venation: Leaf / Leaflet Shapes 3-4 or more times longer than wide: 3-4 Needle-shaped: thin, not flattened. Linear: margins parallel for much of length, flat blade. Lanceolate: lance-shaped, widest near base. Oblanceolate: lance-shaped, widest near tip. Elliptic: widest at middle. Needle Linear Oblanceolate Elliptic Lanceolate Leaf / Leaflet Shapes Leaf less than 3 times longer than wide: Leaf Ovate: egg-shaped widest near base Obovate: egg-shaped widest near tip Oval (= broadly elliptic): widest at middle Ovate Obovate Oval Leaf Bases & Tips Acute: Margins meet at angle of less than 90o. Acute Acuminate: acute and drawn out into a long tip. Obtuse: angle greater than 90o. Obtuse Acute Acuminate Acute Obtuse Leaf Margins: (Small projections). E...
View Full Document

Ask a homework question - tutors are online