cows forests. shift from sheep to cows contributed to reforestation & current vt landscape cows...
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Cows Forests
Shift from sheep to cows contributed to reforestation & current VT landscape
• Cows fall over
steep slopes are spared
• Cows are hard work• More $$ per cow
fewer cows
• Cows need to be fed
hayfields, cornfields, pastures diversify landscape
These are a few of my favorite trees…
Gray pines (Pinus sabiniana)
Sugar pine (Pinus lambertiana)
Pinus lambertiana (Sugar Pine)
Slide 2
Urban 2%
Tundra and wetlands 9%
Desert 20%
Cropland 11%
Range/pasture26%
Forest32%
Slide 3
Forest30%
Parks,wildlife refuge,wilderness 9%
Desert, tundra,wetlands 13%
Urban 2%
Cropland 17%
Range/pasture29%
Global Land Use US Land Use
Federal Lands
Slide 5
National parks and preserves
National forests
National wildliferefuges
Alaska Federal Lands
Slide 6
National parks and preserves National forests National wildlife refuges
Fig. 23.4b, p. 587
Benefits of Forests:Ecosystem services
• Act as giant sponges – watershed protection– Reduce / regulate flows of runoff– Reduce sediment movement to waterways
• Influence regional & local climate
• Support food webs/nutrient cycling
• Provide habitat and niches for wildlife
• Purify the air
Benefits of Forests: Resource for Humans
• Fuelwood – cooking & heat• Construction material• Pulp for paper• Medicines & food from plants & animals• Recreation• Aesthetic • Spiritual• Resource / refuge for the marginalized
Despite many benefits…
Slide 22
Largely uncut, old growth forests, 1620Fig. 23.13a, p. 600
… we have largely deforested the US
Slide 23
Largely uncut, old growth forests, 1998Fig. 23.13b, p. 600
Why is deforestation, especially of old growth intact forest, a worldwide problem?
Slide 11
Annual Deforestation Rates
More than 1% loss
0.5–1% loss
0–0.5 loss
Stable or increased forest
No data
Fig. 23.8, p. 594
Why is deforestation, especially of old growth intact forest, a worldwide problem?
Claims on land• Trees = unclaimed land (in some cultures)• Trees = in way of agriculture or development
Wood• Trees = stacks of cash• Trees = fuel – cooking, heating, processing
Non-market nature of forest benefits• Trees = no value other than wood/pulp
Early Days of Forest Conservation
• Original public lands policy – disposal!“Before the nation could be convinced of the need to conserve
resources, those resources had to become valuable; and for that to happen, they had to be recognized as scarce.” -- Dana & Fairfax, 1980
• 1864 – Man & Nature by G. P. Marsh• First Arbor Day, Nebraska, 1872• New York – 1st to establish State forest
– study 1872– “forever wild” Adirondack preserve 1894
Why US National Forests were Established
• Forest Reserve Act of 1891 – “protection forests”
• 1897 “Organic Act” for national forestsDefined the purpose of Forest Reserves:
1. “Preserve & protect the forest”
2. “Secure favorable conditions of water flow”
3. “Furnish a continuous supply of timber”
• 1960 Multiple Use Sustained Yield Act– Specified / added recreation, range, timber,
water, wildlife and fish
Timber harvest levels in US National Forests
Slide 24
14
12
10
8
6
4
2
01930 1940 1950 1960 1970 1980 1990 2000 2010
Year
Tim
ber
cu
t (b
illio
ns
of
bo
ard
fee
t)
Fig. 23.14a, p. 601
Recreational Visitor Days in US Nat’l Forests
Slide 25
An
nu
al r
ecr
eat
ion
al v
isit
s (m
illio
ns)
350
300
250
200
150
100
50
01930 1940 1950 1960 1970 1980 1990 2000 2010
YearFig. 23.14b, p. 601
Sustained yield & community stability – example from Trinity Co
Public (USFS) vs Private Timber Harvests, Trinity County 1978-1998
0
50000
100000
150000
200000
250000
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
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1998
Private
Public
Timber harvest vs Employment, Trinity County
Timber Harvest vs. Manufacturing EmploymentTrinity County, 1972-2000
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
1972
1974
1976
1978
1980
1982
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1998
Thou
sand
Boa
rd F
eet (
MB
F)
0
100
200
300
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600
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800
Em
ploy
ed P
erso
ns
Timber Harvest (MBF) Manufacturing Employment
The times they are achanging…
• USFS mission changing
• USFS land not enough! – Exhibit all of Rick’s reasons why reserve
systems don’t work for biodiversity.– More people want more out of the forest lands
than they can provide.– US wood demands are real! – can’t just push
off onto countries with weaker environmental protections
Readings for today
Miller, parts of Chapter 23
– In addition to sections Rick specified:
pp. 586-589, 591-593, 600-604 (all of section 23-3)
Exam 1 – Distribution of grades
0
1 0
20
30
40
50
60
<40 40-49 50-59 60-69 70-79 80-89 90-99 100-105
A
Average = 76%Exam 1 = 20% of grade
BCD
F
200 of 1000 points for the semester
Concerns about the exam?
• General questions: ask TAs
• Right answers: ask TAs – check the website
• Disputed grade – ask Cecilia –
email or after class Friday Oct. 25
Check how numbers were added up!