#19 - Energy in Ecosystems

#19 - Energy in Ecosystems - Terrestrial Ecosystems of the...

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1 http://www.nationalgeographic .com/wildworld/terrestrial.html Terrestrial Ecosystems of the World Energy in Ecosystems Production • Primary production – the production of new biomass by plants (and to a much lesser extent bacteria) – Gross primary production (GPP) – Net primary production (NPP) • GPP – RA (autotrophic respiration) • Secondary production -- production of new biomass by consumers of plants J m -2 day -1 Kg ha -1 yr -1 g C m -2 yr -2 Levels of production • Population • Community • Ecosystem – NEP = GPP – RE (RA + RH) • If GPP > RE then the ecosystem is a net sink for C; if GPP < RE then the ecosystem is a net exporter of C – autochthonus vs. allochthonus
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2 This could be biomass instead of numbers. .. Production can include growth of individuals, and it can also include the offspring produced! Table 17.1 Units = Pentagrams of C per year (a pentagram = 10 15 g!) Terrestrial primary production Any obvious patterns?
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3 Limits to productivity • Production in terrestrial
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#19 - Energy in Ecosystems - Terrestrial Ecosystems of the...

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