Flux of Carbon Pools

CO2 fixed by plants during photosynthesis is transferred across pools such as litter, deadwood and soil carbon. Carbon cycle in a land-use system includes changes in carbon stocks due to both continuous processes (growth and decay) and discrete episodic events such as disturbances (fire, harvest, land-use change and pest attack). A generalized flow chart of flux of carbon pools is given in Fig. 4.1 (IPCC 2006). All fluxes can be accounted for by estimating the stocks of all the carbon pools at

Stock And Flow Co2
Fig. 4.1 Carbon pools and pathways of carbon flows (IPCC 2006)

two points in time. The annual carbon stock change for a given land-use system or land-use change or management practice is estimated as the sum of changes in all the pools, expressed as tonnes of carbon per hectare per year (tC/ha/year) (refer to Chapter 9 for equations).

After defining the carbon pools, and their proportions and fluxes, the next question to be addressed is this: Which among the five carbon pools should be selected for a mitigation project, a roundwood production project or a national GHG inventory process? Section 4.2 discusses the criteria for selection, and Section 4.3 assesses the importance of different carbon pools for different types of projects.

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Project Management Made Easy

Project Management Made Easy

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