Barrons AP Environmental Science

(Marvins-Underground-K-12) #1
Figure  7.6 Deforestation   in  the United  States  (1620–present)

Methods Used to Manage and Harvest Trees


Figure  7.7 Even-aged   and uneven-aged management

■ CLEAR-CUTTING—all of  the trees   in  an  area    are cut at  the same    time.   This
technique is sometimes used to cultivate shade-intolerant tree species.
Environmental impacts of clear-cutting include:


  • Microclimates within the forest are changed, affecting the associated
    food webs

  • Water runoff, which produces soil erosion, increases

  • A decrease in biodiversity caused by the loss of habitats

  • A temporary increase in the amount of available wood followed by very

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