Forestry (Clear Cutting vs Selective Cut

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Information about Forestry (Clear Cutting vs Selective Cut
Education

Published on November 8, 2009

Author: dantescience

Source: authorstream.com

Logging Forests : Logging Forests 1 M.Bregar (Dante C.S.S.) Importance of Forests : Importance of Forests Forest are important because: Involved in Nutrient Cycles Recycle water, carbon dioxide, and oxygen Regulate climate Controls Water Flow Holds groundwater Prevents erosion (leaves catch 60% of rain) 2 M.Bregar (Dante C.S.S.) Involved in Nutrient Cycles : Involved in Nutrient Cycles 3 M.Bregar (Dante C.S.S.) Involved in Nutrient Cycles : Involved in Nutrient Cycles Carbon Cycle 4 M.Bregar (Dante C.S.S.) Importance of Forests : Importance of Forests What is Erosion? The movement and loss of soil Soil can be eroded by (1) force of a rain drop and (2) blowing winds Deforestation has increased erosion because of “rain splash” 5 M.Bregar (Dante C.S.S.) Rainsplash & Erosion : Rainsplash & Erosion 6 M.Bregar (Dante C.S.S.) Erosion : Erosion 7 M.Bregar (Dante C.S.S.) Soil Erosion Worldwide : Soil Erosion Worldwide 8 M.Bregar (Dante C.S.S.) Deforestation : Deforestation 9 M.Bregar (Dante C.S.S.) Deforestation : Deforestation The removal of forests and natural plant growth by natural or human means. 10 M.Bregar (Dante C.S.S.) Slide 11: 11 M.Bregar (Dante C.S.S.) Deforestation in Brazil : Deforestation in Brazil 12 M.Bregar (Dante C.S.S.) Deforestation in Brazil : Deforestation in Brazil 13 M.Bregar (Dante C.S.S.) Deforestation in Brazil : Deforestation in Brazil 14 M.Bregar (Dante C.S.S.) Deforestation in Madagascar : Deforestation in Madagascar 15 M.Bregar (Dante C.S.S.) Deforestation in Sumatra : Deforestation in Sumatra 16 M.Bregar (Dante C.S.S.) Deforestation in Sumatra : Deforestation in Sumatra 17 M.Bregar (Dante C.S.S.) Deforestation in Sumatra : Deforestation in Sumatra 18 M.Bregar (Dante C.S.S.) Deforestation in the Congo : Deforestation in the Congo 19 M.Bregar (Dante C.S.S.) Types of Logging : Types of Logging 20 M.Bregar (Dante C.S.S.) Logging : Logging Logging is the practice of cutting trees in large quantities for commercial (human) use Two methods are Clear Cutting Selective Cutting 21 M.Bregar (Dante C.S.S.) Clear Cutting : Clear Cutting Logging companies comes in and cuts all trees Preferred method 22 M.Bregar (Dante C.S.S.) Clear Cutting : Clear Cutting 23 M.Bregar (Dante C.S.S.) Clear Cutting : Clear Cutting Advantages Less expensive so wood products are cheaper Company chooses types of trees to replant 24 M.Bregar (Dante C.S.S.) Replanting Trees : Replanting Trees Hardwood Trees (deciduous trees) Softwood Trees (evergreen trees) 25 M.Bregar (Dante C.S.S.) Clear Cutting : Clear Cutting Disadvantages Increase in soil erosion Nitrates are not absorbed by trees, so nitrates are washed into rivers and create algal bloom Food webs & habitats are destroyed 26 M.Bregar (Dante C.S.S.) Soil Erosion : Soil Erosion 27 M.Bregar (Dante C.S.S.) Soil Erosion : Soil Erosion 28 M.Bregar (Dante C.S.S.) Algal Bloom : Algal Bloom 29 M.Bregar (Dante C.S.S.) Loss of Habitat : Loss of Habitat 30 M.Bregar (Dante C.S.S.) Slide 31: 31 M.Bregar (Dante C.S.S.) Clear Cutting : Clear Cutting Trees are replanted after the cut, but….. Monoculture Forest Trees planted are 1 or 2 types of trees Decreases biodiversity which results in Less complex food webs Trees being more susceptible to disease 32 M.Bregar (Dante C.S.S.) Complex Food Web vs Simple Food Web : Complex Food Web vs Simple Food Web 33 M.Bregar (Dante C.S.S.) Monoculture Forest vs Natural Forest : Monoculture Forest vs Natural Forest 34 M.Bregar (Dante C.S.S.) Selective Cutting : Selective Cutting Only certain trees are harvested from an area Trees harvested are usually largest (oldest) an most valuable 35 M.Bregar (Dante C.S.S.) Selective Cutting : Selective Cutting 36 M.Bregar (Dante C.S.S.) Slide 37: 37 M.Bregar (Dante C.S.S.) Slide 38: 38 M.Bregar (Dante C.S.S.) Selective Cutting : Selective Cutting Advantages Natural Forest left intact to regrow naturally Increased biodiversity Decreased soil erosion Disadvantages More difficult so more expensive More dangerous for loggers 39 M.Bregar (Dante C.S.S.) Haiti vs Dominican Republic : Haiti vs Dominican Republic 40 M.Bregar (Dante C.S.S.)

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