Human Impact 1

Question 1

In 2022 there was ____births and____deaths

Answer 1

135 million
55 million deaths
an increase of 80 million/year

Question 2

What are the tree different deforestation classification?

Answer 2

1.Selective cutting-removal of single trees by helicopter, most similar to natural disturbance but cost lots

2.Variable retention-leave representative old growth in each cut block(10-30% retention) low profit b/c of coast of roads

3.Clear cutting-remove all trees in patches- most invasive, most money

Question 3

Lateritic soils

Answer 3

soils that a leached of silica after deforestation

Question 4

Amazon is the largest___in the world. And is a major export market for____countries

Answer 4

cattle herd in the world, export of beef for 170 countries. They tripled exports in the last 3 years

Question 5

SE Brazil has currently ___sq/km logged per year. 2022 is

Canada imports ___of beef yearly from brazil

Answer 5

10,000sq/km logged per year
2022 is the highest in 50 years
imports 20 million dollars

Question 6

Coastal temperate rainforests are the greatest __

Answer 6

biomass/ha of all ecosystems on the planet

Question 7

On vancouver island by 1999 __% of the ancient Forests were logged

Answer 7

71

Question 8

Gribbell island is

Answer 8

spirit bear island
which has 15% white bears
logged in 1989

Question 9

About 1/2 of the worlds___have been cut our

Answer 9

temperate rainforests

Question 10

BC has about 1/4 of the worlds remaining ___

Answer 10

coastal temperate rainforest

Question 11

Ecotone

Answer 11

transition between two biological communities

Question 12

Edge effect

Answer 12

leads to reduced fragment size. Reduced fragment size-leads to reduced size of populations and reduced number of species

Question 13

Habitat change

Global warming-Atmospheric contaminants

Answer 13

carbon dioxide

What evidence that the carbon dioxide rise is due to burning of fossil fuels?

Antarctic Ice Core Data

Question 14

——were formed about 300 million years ago from the forest anf swamps of the Paleozoic

Answer 14

Fossil fuels(coal and oil)

Question 15

There are___isotopes in carbon. Explain

Answer 15

3
C12(99% radiocarbon) C13(1%) and C14(0.00000001%)

Living plants absorbs all isotopes but C14 is most unstable letting it decay to N14 every 5730y

So fossil fuels (300 million yrs) have virtually no C14
Burin it fossil fuels releases CO2 without C14