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Trees and Forests

by: Miss Macy Buckridge

Trees and Forests PLB 144

Miss Macy Buckridge
GPA 3.68


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This 3 page Class Notes was uploaded by Miss Macy Buckridge on Tuesday September 8, 2015. The Class Notes belongs to PLB 144 at University of California - Davis taught by Staff in Fall. Since its upload, it has received 59 views. For similar materials see /class/187546/plb-144-university-of-california-davis in Plant Biology at University of California - Davis.


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Date Created: 09/08/15
ERSEHUFPLB144 Trees amp Forests Fall 2001 Dr Caroline Bledsoe 29 October 2001 Forest Soils the m renewable physical resource Key Concepts There are 5 soil forming factors 7 time biota topography climate parent material Soil texture a ects tree growth water amp nutrient availability soil aeration CEC cation exchange capacity is a measure of plant nutrient availability Clear cutting can cause nutrient losses by leaching especially NO393 and SOZ394 The type of forest tree species strongly in uences soil properties Many forest soils are acidic especially confer forests and soil pH affects many soil and plant processes 9959 Study Questions 1 When trees are harvested which 2 nutrients are removed in greatest amounts How are they replenished 2 Which soil layer or horizon contains the most nutrients 3 Why is CEC important What are cations and anions Examples 4 Does surface soil erosion matter since there is still a deep layer of parent material 5 Why are soil aggregates important How do they form 1 Introduction We cannot manage forest ecosystems sustainably unless we maintain those soil conditions and processes that help to determine forest ecosystem function and ability to recover from disturbance Much of the negative environmental impact of forestry in the past has been related to effects on soils Kimmins 1997 Forest Ecology pp 268269 A Why are soils the least renewable resource How does timber harvesting remove nutrients How are nutrients replenished 1 Fig 514 Kimmins B Five soil forming factors 7 7 time biota topography climate parent material C Soil formation Glacier Bay Alaska 2 Fig 515 Kimmins 2 Soil Properties A Appearance Soil horizons 3 Fig 112 B Physical 1 Texture 4 Fig 113 2 Structure amp aggregates 3 Color 4Water content 5 Fig 115 C Chemical 1 Nutrients 2Cation exchange capacityCEC 6 3 Soil pH 7 Fig117 4Soil Organic Matter D Biological1 The Rhizosphere 2 Soil microbes bacteria lngi amoebae actinomycetes algae 3 Soil animals microfauna protozoa nematodes mites mesofauna ants springtails larger mites macrofauna earthworms millipedes spiders termites gophers shrews mice 3 Forest Vegetation amp Topography affect soils eg Michigan s Upper Peninsula 8 Fig 118 To learn more about Forest Soils WEB sources httn39 lawrncdavis 39 100 index html httpwwwsoilsorg CLASSES SSC10 Concepts Soil Science SSC100 Principles Soil Science SSC111 Soil Microbio SSC112 Soil Ecology SSC 118 SoilsLand UseEnvironment BOOKS 1 Kimmins JP 1997 Forest Ecology 2nd Ed Prentice Hall N 2 Perry David A 1994Forest Ecosystems Johns Hopkins Press NY 3 Killham K 1994 Soil Ecology Cambridge U Press Cambridge UK Trees and Forests October 1 2001 ENHERSPLB 144 Questions 1 What is a Forest 2 What is a Tree 3 What are Forests useful for commodities lumber paper products rewood mushrooms livestock grazing recreation scienti c study storage of carbon and nutrients watershed protections wildlife habitat 4 How can we study Forests Forest Ecology 1 Organisms within the ecosystem their populations and communities 2 Ecosystem Functioning complex interactions among organisms and their supporting environment 3 Spatial patterns and interrelationships Ecosystem climate landform soil organisms plant animal fungal microbial space time Ecosystem Structure the spatial arrangement of parts Ecosystem Function processes chemical weathering of rock to soil decomposition oforganic matter plant and animal nutrient and water cycling biomass accumulation photosynthesis succession disturbance The Tree As a System Structure Roots woody ne Stem Branches Leaves Function Nutrient and Water Uptake Support Transport Photosynthesis Definitions Tree A plant with a permanently woody trunk and branches Webster s A perennial plant that usually grows taller than four to ve meters with a single woody trunk that lacks lower branches but which supports branches well above the ground Generally it is a plant capable of attaining a diameter of10 cm at breast height The Dictionary ofEcoogy and Environmental Science Forest A threedimensional ecological system dominated by trees and other woody vegetation that exist in dynamic interaction with the airearth matrix ofthe landscape ForestEcoogy A large tract of land covered with trees and underbrush Webster s A large group oftrees especially but not necessarily those growing close enough that the tops of most touch or overlap shading the ground below Forests may or may not have extensive undergrowth The Dictionary of Ecology and Environmental Science


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