Tree Biology. Keith Wood Colorado State Forest Service. (Modified for CMVFS 9/13/16 Donna Davis)
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1 Tree Biology This session will cover tree anatomy (structure) and tree physiology (function) including how a tree is put together, how it grows in its environment and Compartmentalization of Decay in Trees (CODIT) Keith Wood Colorado State Forest Service (Modified for CMVFS 9/13/16 Donna Davis)
2 Tree Biology Tree Biology-the study of structure and function, and the relationship between them Anatomy-the study of the component parts of the tree Physiology-the study of the biological and chemical processes within these components
3 Tree Anatomy-Cells and Tissues Apical Meristems-primary meristems that produce cells that result in elongation of roots and shoots Lateral Meristems-secondary meristems that produce cells that result in an increase in diameter -cambium-thin, continuous sheath of dividing cells that produces cells that will become the vascular system of the tree -xylem-produced to the inside (H 2 O) -phloem-produced to the outside (CHOs) -cork cambium-produces bark
4 Apical (Primary) Meristem-Shoots From ISA Introduction to Arboriculture Tree Biology CD & Arborist Certification Study Guide
5 Apical (Primary) Meristem-Roots
6 Lateral (Secondary) Meristems
7 Tree Anatomy-Cells and Tissues Xylem-wood of the tree, made up of live and dead cells -conducts water and mineral elements -supports weight of tree -storage of resources -defends against spread of disease/decay Phloem-responsible for movement of sugars, produced in the leaves, to roots and throughout the plant for storage and consumption
8 Tree Anatomy-Cells and Tissues Sapwood-xylem which functions to conduct water Heartwood-xylem which is nonwater conducting tissue - can sometimes be darker in color Earlywood-xylem (wood) produced in Spring Latewood-xylem (wood) produced in Summer-growth ring Ray cells-cells that function to transport sugars and other compounds through the trunk radially
9 Tree Anatomy-Leaves Leaves-food producers of the tree -chloroplasts-specialized organelles found in cells that are the site of photosynthesis -chlorophyll-green pigment of plants, found in the chloroplasts -cuticle-waxy layer outside the epidermis of a leaf -stomates-small pores between two guard cells through which gases are exchanged Mizzou On-Line, Dr. Shibu Jose
10 Tree Anatomy-Roots Small absorbing roots Sinker roots Taproot (walnut, hickory, etc.) Lateral roots-can extend 2-3 times the crown radius, usually in top 12 of soil
11 From ISA Arborists Certification Study Guide, Figure 1.10, 1 st edition
12 Critical Root Zone
13 Tree Anatomy-Bark Bark-outer covering of a tree s branches and stems composed of nonfunctional phloem and corky cells -moderates temperature -defense against injury -reduces water loss Lenticels-small openings in bark that allow for gas exchange
14 Tree Anatomy-Branches Branch collar-shoulder area where a branch joins another branch or trunk created by the overlapping xylem tissues Branch bark ridge-area of a tree s crotch where the growth and development of the two adjoining limbs pushes the bark into a ridge From ISA Arborists Certification Study Guide, Figure 8.2, 1 st edition
15 Tree Physiology- Photosynthesis Photosynthesis-process by which green plants use light energy to build carbon molecules from water and carbon dioxide Photosynthate (Food)-sugar and other products of photosynthesis, much of which is stored for later energy requirements
16 Tree Physiology-Photosynthesis Chlorophyll and Chloroplasts From ISA Arborists Certification Study Guide, Figure 1.15, 1st edition
17 From 2008 NADF 5 th Grade Poster Contest Guide
18 Tree Physiology-Respiration Respiration-process by which carbohydrates produced from photosynthesis are converted to energy by using oxygen Opposite reaction of photosynthesis
19 Tree Physiology Hormones and Growth Regulation
20 Tree Physiology Hormones and Apical Dominance
21 Humans Heal and Trees Seal
22 CODIT-Compartmentalization of Decay in Trees
23 CODIT-Compartmentalization of Decay in Trees -Wall 2-resists inward spread of decay-compact latewood cells -Wall 1-resists vertical spread of decay-xylem plugging-weakest wall -Wall 3-resists lateral spread-ray cells Figures Courtesy of ISA Introduction to Arboriculture Tree Biology CD/Photos Courtesy of Vince Urbina -Wall 4-resists outward spread into new wood that is formed-strongest wall
24 QUESTIONS?
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