L17_Forests - Lecture 17 Forests biodiversity...

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Lecture’17’–’Forests,’biodiversity,’sustainability’ Reminder:’Homework’2’is’due’this’Friday,’in’class’ Key’points’/’topics’/’vocab’ Tropical,’temperate,’and’polar’laCtudes’ Evergreen’versus’deciduous’trees.’Why’do’trees’shed’leaves?’ Forests’and’albedo.’Boreal’forest’albedo’temperature’feedbacks.’ Rainforests:’Where’are’the’nutrients’stored,’and’how’does’this’a±ect’ regrowth’a²er’deforestaCon’ Rainforests’and’deforestaCon:’Soil’heaCng’and’light’saturaCon’hampers’ regrowth’ Rainforests’and’local’water’cycles’ Laterites:’Nutrient’poor’soils’of’rainforests.’Why’are’they’nutrient-poor?’ Progress’of’human-induced’deforestaCon.’Where’is’it’happening’now?’Who’ are’the’biggest’wood’producers?’What’is’the’wood’used’for?’ Biodiversity:’Some’ideas’about’what’leads’to’the’evoluCon’of’high’biodiversity’ Human’uses’of’forests’
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A’six-category’classifcaCon’oF’Earth±s’Forests’ DefniCons:’tropical,’temperate,’deciduous’ vs’evergreen.’ ²oniFer.’Deciduous’because’oF’dry’versus’cold/light’
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Regions’where’all’twelve’months’are’above’18’°C’(=’64’°F)’ Wikimedia’Commons’
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What’are’evergreen’trees?’
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Evergreen:’Leaves’are’retained’year-round’ ’’ (not’to’be’confused’with’ conifers ’–’pines,’spruces,’Frs.’ ’’’ conifers’are’a’kind’of’evergreen’tree,’but’not’all’ evergreens’are’conifers)’ Tropical’evergreen’forests’
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A’six-category’classifcaCon’oF’Earth±s’Forests’ DefniCons:’tropical,’temperate,’deciduous’ vs’evergreen.’ ²oniFer.’Deciduous’because’oF’dry’versus’cold/light’
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Wikimedia’Commons’ Seasonality’of’rainfall’in’the’tropics:’Low’within’a’few’degrees’of’equator,’typically’high’ between’~10°’and’25°’
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Deciduous’forests:’Forests’with’trees’shedding’leaves’annually’or’ subannually’ In’tropics:’Leaf’loss’typically’associated’with’dry’season’ In’temperate’laCtudes:’Leaf’loss’associated’with’cold’and’darkness’(winter)’ Tropical’dry’forest,’±osta’Rica’
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A’six-category’classifcaCon’oF’Earth±s’Forests’ DefniCons:’tropical,’temperate,’deciduous’ vs’evergreen.’ ²oniFer.’Deciduous’because’oF’dry’versus’cold/light’
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desert’ desert’ rainforest’ savannas :’gray,’verCcal’hatched,’ cross-hatched’ ‘stable±’savannas :’gray’ ‘unstable±’savannas :’verCcal’hatched’ ’’ ‘transiConal±’savannas :’ ’’’ cross’hatched’ stable’ unstable’ transiConal’ unstable :’savannas’
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