primary productivity
DESCRIPTION
Primary Productivity. Jason Broshear Katherine Echement Zach Moning Leo Sack. Photosynthesis. Photosynthesis. Respiration. Carbon Cycle. Greenhouse Effect. Primary Productivity. Phytoplankton. Phytoplankton. Single-celled plants Photosynthesis - PowerPoint PPT PresentationTRANSCRIPT
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Primary Productivity
Jason BroshearKatherine EchementZach MoningLeo Sack
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Photosynthesis
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Photosynthesis
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Respiration
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Carbon Cycle
Sink Amount in Billions of Metric Tons
Atmosphere 578-766
Soil organic matter 1500 to 1600
Ocean 38,000 to 40,000
Marine sediments and sedimentary rocks 66,000,000 to 100,000,000
Terrestrial plants 540 to 610
Fossil fuel deposits 4000
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Greenhouse Effect
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Primary Productivity
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Phytoplankton
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Phytoplankton
• Single-celled plants• Photosynthesis• Lots of them – about
half of plant biomass on the planet
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Phytoplankton – nutrient influence
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Biological Pump
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Phytoplankton Distribution
• Where is the most phytoplankton productivity?
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Arctic and Southern Oceans• In high latitudes,
most nutrients rarely used up
• Limiting factor: dissolved iron
• “Fertilize” these regions with iron, more productivity
• Solution to global climate change??
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Problems with Iron Fertilization• Zooplankton grazing
also a limiting factor• Much added iron
“lost” – affects on other ecosystems?
• Limited effect on CO2 – most recycled in water, not sinking
• Not economically feasible solution
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Boreal Forest: Background• The northern boreal ecoregion accounts for about one third of this
planet's total forest area.• Is considered one of the largest carbon sinks.• Most dominant tree species are conifers which are well-adapted to
the harsh climate, and thin, acidic soils. • There are innumerable water bodies: bogs, fens, marshes, shallow
lakes, rivers and wetlands, mixed in among the forest and holding a vast amount of water.
• Fire is a crucial disturbance factor in the boreal ecoregion because it facilitates the destruction of old, diseased trees along with the pests that are associated with those trees.
• Some trees such as aspen and jackpine actually require fires to stimulate their reproductive cycles. Furthermore, the nutrient-rich ash left behind helps fuel plant growth.
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Grasslands: Background
• Tropical grasslands (Savannas) and temperate
• Savannas have wet and dry seasons - heavy rain and seasonal fires
• Grasses are dominant, trees and large shrubs mostly absent
• Large and small mammals, reptiles, birds, etc.
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Grasslands
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Net Primary Productivity of Different Biomes
0
5
10
15
20
25
desertsemidesert
tundralake/stream
temperate grassland
boreal forestagriculture
temperate foresttemperate woodland
tropical savannatropical forest
wetland
Ecosystem
Area (10^12 m^2)
0
200
400
600
800
1000
1200
desertsemidesert
tundralake/stream
temperate grassland
boreal forestagriculture
temperate foresttemperate woodland
tropical savannatropical forest
wetland
Ecosystem
NPP (gC/m^2/yr)
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Nitrogen Cycle
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Phosphorus Cycle
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