The global and forest environment carbon cycle

Type :

Presentation

Pages :

5 pages

Format :

.doc

Published date :

11/25/2008

Category :

Political science

Sub category :

Ecology & environment

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Summary :

Introduction.
The global carbon cycle.
The forest carbon cycle.
1. The difference between GPP and autotrophic respiration.
2. The biomass pools in a forest.
3. The ?gures for global NPP, NBP, and RH.
4. Increasing indications - carbon stocks in the world's forests may be increasing.
Global Increases in CO2.
1. The atmospheric concentrations of carbon dioxide methane and nitrous oxide.
2. The rate of change in CO2 concentrations.
3. The period between 1980-2000 75% of the CO2 emissions from the burning of fossil fuels.
Forests and the 'Greenhouse Effect'.
Trees to mitigate CO2 increases.
Conclusion.

Abstract

The forest environment carbon cycle can be viewed at a number of scales. Measurements can be made at the scale of an individual leaf or tree, stand-scale measurements can be made, and models can be developed that examine forest-level, regional, and global carbon cycles. The role of the forest in the global carbon cycle has become increasingly important as it is realized that forests and forestry have a role to play in mitigating the so-called greenhouse effect. This article examines the sources, sinks, and ﬂuxes of carbon as they relate to forests and then places this information within the context of global change. Finally, the potential contribution of forests to the mitigation of climate change is assessed. The main components of the natural global carbon cycle are the sources, sinks, and ﬂuxes between the land, oceans, atmosphere, and geological reservoirs. Current estimates suggest that the atmosphere contains about 730 PgC, the land 2000 PgC, the oceans 38 000 PgC, and that an unknown amount remains in geological reservoirs. The greatest natural ﬂux (120 PgC per year) is between the land and the atmosphere, with a smaller ﬂux occurring between the atmosphere and the oceans (90 PgC per year).