The Carbon Cycle and Primary Productivity Chap. 18: 399-411, Chap. 19: 423-4 I. Introduction A. Questions about elevated CO 2 B. Ecosystem ecology definitions.

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Presentation transcript:

The Carbon Cycle and Primary Productivity Chap. 18: , Chap. 19: I. Introduction A. Questions about elevated CO 2 B. Ecosystem ecology definitions Components, Pools and fluxes II. C-cycle Pools and Fluxes A.Terms B.Schematics III. Controls on Primary Production A. Climate B. Resources C. Time D. Organisms

I.Introduction A. Questions What causes uptake by natural systems? How much capacity to continue absorbing CO 2 ? What might limit their uptake capacity? What can we do to enhance ecosystem uptake and thereby slow the atmospheric increase?

I. Introduction B. Ecosystem ecology terms 1. Components: autotrophs, heterotrophs, dead organic matter 2. Pools and fluxes 3. Ecosystem principles

Ecosystems - components Respiration

Food webs Freeman, Fig. 54.6

ECOSYSTEM PRINCIPLES 1- Energy flow 2- Chemical cycling ENERGY- Cannot be recycled, flows through ecosystems, from an external source, enters as light exits as heat. MATTER- Cycles within ecosystems. Autotrophs Heterotrophs Energy flow and chemical cycling described by grouping species in a community into trophic levels according to main source of nutrition and energy Tertiary consumers, etc. PHOTO, chemo (decomposers) C&R 54.1

Main messages C flow is linked to energy flow Energy flows through systems Matter, elements cycle Organisms can be grouped in trophic levels

II. C-cycle pools and fluxes A.Terms 1. Simple C cycle schematic 2. Biomass vs. productivity 3. GPP vs. NPP vs. NEP 4. Secondary production B. More detailed C-cycle schematic

1. C cycle: Simple Version Terms 2. Biomass vs. productivity 3. GPP vs. NPP vs. NEP 4. Secondary production

Production and biomass vary greatly across different ecosystems (Freeman, 3rd ed.)

Marine systems 18.9

B. C-cycle schematic: the more detailed version

What influences sink strength?

III. Controls on primary production A. Climate B. Resources C. Time D. Organisms

A.Climate controls Temperature Precipitation

18.3

B. Resources: nutrients 18.4

Which nutrients? 18.5

Freshwater systems are usually limited by P 18.6 Japanese and North American lakes (observational study)

18.8 Whole lake experiment - Canada

Marine systems 18.9

Open oceans: Fe limitation

The Biological CO 2 pump

Eutrophication: Is more production always good?

Eutrophication in the Gulf of Mexico

Resources What about CO 2 ?

C. Time – GPP, NPP, NEP peak in mid- succession Schlesinger 2001

18.11 D. Organisms – effects on production and energy flow Top down: trophic cascades

Ecobeaker demonstration

18.12

End