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Table 1 Overview of the accounting approaches and the IPCC guidelines for harvested wood products (HWPs)

From: The default methods in the 2019 Refinement drastically reduce estimates of global carbon sinks of harvested wood products

Accounting approach

SCA

AFA

PA

PA13 (PA13i)

SCA19

AFA19

PA19

IPCC guidelines

2006 Guidelines

(Tier 1)

2006 Guidelines

(Tier 1)

2006 Guidelines

(Tier 1)

2013 Guidance

(Tier 2)

2019 Refinement

(Tier 1)

2019 Refinement

(Tier 1)

2019 Refinement

(Tier 1)

Considered HWPs

Sawnwood, wood-based panels, paper and paperboard, other industrial roundwood

Sawnwood, wood-based panels, paper and paperboard, other industrial roundwood

Sawnwood, wood-based panels, paper and paperboard, other industrial roundwood

Sawnwood, wood-based panels, paper and paperboard

Sawnwood, wood-based panels, paper and paperboard

Sawnwood, wood-based panels, paper and paperboard

Sawnwood, wood-based panels, paper and paperboard

HWP activity data

FAOSTAT

Decay function

First-order decay function

Half-life (years)

Sawnwood

30

30

30

35

35

35

35

Wood-based panels

30

30

30

25

25

25

25

Paper and paperboard

2

2

2

2

2

2

2

Other industrial roundwood

30

30

30

    

Inflow to carbon stocks

Consumed wood

Consumed wood

Harvested wood

Harvested wood

Consumed wood

Consumed wood

Harvested wood

Initial year for carbon stocks

1900

1900

1900

1900 (1961)

1990

1990

1990

Exports and imports for the AFA and AFA19

 

All wood-based materials

   

Feedstock for HWPs

 

Share of domestic feedstock for the PA, PA13, and PA19

Sawnwood, wood-based panels, and other industrial roundwood

  

Production (using IRW, WCP, and WR)

Production minus exports (using IRW)

  

Production minus exports (using IRW)

Paper and paperboard

Production minus exports (using IRW and WP)

Production minus exports (using IRW, WP, and RP)

Carbon conversion factors

Industrial roundwood, sawnwood, wood chips, wood residues, etc. (tC/m3)

0.225 (temperate)

0.295 (tropical)

0.225 (temperate)

0.295 (tropical)

0.225 (temperate)

0.295 (tropical)

0.229 (aggregate)

0.229 (aggregate)

0.229 (aggregate)

0.229 (aggregate)

Wood-based panels (tC/m3)

0.294

0.294

0.294

0.269

0.269

0.269

0.269

Paper and paperboard (tC/t)

0.450

0.450

0.450

0.386

0.386

0.386

0.386

Wood pulp (tC/t)

 

0.450

 

0.386

 

0.417

0.417

Wood charcoal (tC/t)

 

0.765

   

0.765

 
  1. “SCA,” “AFA,” and “PA” denote the stock-change approach, atmospheric flow approach, and production approach, respectively. “IRW,” “WCP,” “WR,” “WP,” and “RP” denote industrial roundwood, wood chips and particles, wood residues, wood pulp, and recovered paper, respectively