chapter 2: energy flows and ecosystems · chapter 2: energy flows and ecosystems . last day… !...
TRANSCRIPT
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Chapter 2: Energy Flows and
Ecosystems
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Last Day…
l Most energy on Earth derives from the radiant energy of the sun
l This radiant energy is transformed into chemical energy and mechanical energy
l Try to understand energy in relation to transformations, how energy flows through ecosystems, and the ecosystem consequences that result
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Energy
l Most of the energy available for use is called low-quality energy Ø diffuse, dispersed at low temperatures, difficult to gather
l The total energy of all moving atoms is referred to as heat, a low-quality energy Ø vs. temperature, a measure of average speed of molecules
or atoms in a substance
l High quality energy, such as a hot fire or coal, is easy to use, but the energy disperses quickly
l Energy type should be matched to use to maximize efficiency
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Energy
Laws of Thermodynamics l The second law of thermodynamics is important
Ø for organisms because they must continuously expend energy to maintain themselves; whenever they use energy, some is lost
Ø because it tells us that energy cannot be recycled; it is constantly being degraded; the more we transform energy, the more is dispersed becoming less useful and lower quality
Ø In geological terms we have released the energy input of millions of years in the blink of an eye (250 years)
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Energy
l Some of the principal transformations that have to take place to achieve a sustainable society are Ø to view high energy consumption as undesirable
Ø to reduce energy waste
Ø to switch from the non-renewable sources of energy that now dominate (coal and oil particularly) to renewable sources
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Ecosystem – is made of a number of abiotic and biotic components, which are connected to one another by flow of energy through them
• a collection of communities interacting with the environment
• emphasizes a systems approach
• a Community consists of a number of populations of organisms in a particular environment
Abiotic and Biotic Components of Ecosystems
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Abiotic Components
u The ecosphere u Lithosphere u Hydrosphere (and cryosphere) u Atmosphere
u Troposphere u Stratosphere u Mesosphere u Thermosphere
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Earth’s Components: Ecosphere
3-3 D.Draper (2001). Our Environment: A Canadian Perspective, Second Edition
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The Lithosphere
1. Tectonic Processes
2. Geomorphological Processes
3. Environmental issues in Lithosphere
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1. Tectonic Processes in the Lithosphere
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Continental Drift – earth is broken into huge slabs or plates, each moving in response to the currents of molten material below the earth’s crust
Pangea
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Faulting: process that fractures the earth’s crust
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Folding – bends and deforms the earth’s crust
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Subduction: dense plate pushed under lighter one
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Weathering: a complex compound is reduced to its simpler component parts, transported via physical processes, or biodegraded over time
Erosion: The wearing away of land or soil by the action of
wind, water, or ice Transportation and Deposition: the natural processes of
moving and laying down a deposit of something (wind, water, waves, ice)
2. Geomorphological Processes in the Lithosphere
Glaciation
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Maximum extent of ice, 18,000 BP
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Energy Diffusion
TECTONIC PROCESSES Slow but steady Rapid / Instantaneous Crustal movement Earthquakes - folding - faulting Volcanic Activity - subduction
mass movement - slopes wind - dryland environments water - rivers waves - coastal areas ice - high latitudes / high altitudes
GEOMORPHOLOGICAL PROCESSES Weathering Erosion Transportation Deposition - Physical - Chemical
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3. Environmental issues in the Lithosphere
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Shield Environments
l Oldest geologically (3-4 BY)
l Exposed areas of ancient, stable continental rocks or cratons
l Buried in places by younger sediments
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Environmental Issues in the Shield
l High mineral potential from heat and pressure (metamorphosis)
l Obtaining minerals leads to: – Landscape / hydrological changes – Extraction and disposal as waste – Release of acid gases from smelting – Deforestation faster that regeneration – Habitat Loss – Not densely populated
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Fold Mountain Environments
l Active mobile belts that develop along margins of some continental cratonic blocks
l Deposited sediments (shield erosion) are crumpled through folding (Orogenesis)
l Volcanic material injected into cracks
l Youngest rock (approx. 600 MYA - 100 MYA)
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l Naturally restricted until technology and rapid
population growth increased:
– Mining, forestry and Hydro – Tourism and recreation values – Slope destabilization, pollution, waste – Turbidity and silt in streams – Soil erosion, flash flooding
Environmental Issues in Fold Mountain Environments
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Plain Environments
l Sediments eroded from shield and mountains and deposited in major sedimentary basins (Great Plains 100-250MYA)
l Consolidate into shale or sandstone l Formed from the skeletons and shells of organisms, and
chemical processes that created carbon compounds l Recent deposits of unconsolidated fluvial, lacustrine and
glacial deposits l Also formed in continental shelves
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l Agricultural revolution to domesticate plants and animals
l Aquatic environment altered by irrigation and deterioration of soils
l Flooding / drought / diversions
l Nutrient loading affects Water quality
l Building materials, fossil fuel
Environmental Issues in Plain Environments
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Conclusions
l We have technological solutions, land-use planning and mitigation techniques to address many localized environmental issues (First Wave Issues)
l How do modern environmental risks (Natural Disasters?) challenge our traditional approach to environmental issues in the second wave of the movement?