Woodlands plantations have high woodlands biodiversity

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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...
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This document was uploaded on 03/28/2014 for the course BIO 131 at Stephen F Austin State University.

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