ghg-inventory-1990-2013

Table 11.3.3
Uncertainty in New Zealand’s estimates for afforestation/ reforestation, deforestation and
forest management in 2013
Activity data
Afforestation/
reforestation
Post-1989
forest
Uncertainty (%) at a 95% confidence interval
Pre-
1990
natural
forest
Deforestation
Pre-
1990
planted
forest
Post-
1989
forest
Forest
management
Pre-
1990
natural
forest
Pre-
1990
planted
forest
Uncertainty in land area 8.0 5.0 5.0 5.0 5.0 5.0
Emission factors
Uncertainty in biomass
carbon stocks
Uncertainty in soil carbon
stocks
Uncertainty in harvested
wood products
Uncertainty introduced into
emissions for Kyoto Protocol
Note:
8.6 6.7 12.4 8.6 6.7 12.4
10.4 7.9 12.3 10.4 7.9 12.3
51.3 – – – – 51.3
6.3 0.3 2.4 0.2 10.7 41.0
All land that has been afforested or reforested since 1 January 1990 is defined as post-
1989 forest. Land deforested since 1 January 1990 may be pre-1990 natural forest,
pre-1990 planted forest or post-1989 forest.
Total uncertainty in New Zealand’s estimates of emissions for Article 3.3. and 3.4 of the
Kyoto Protocol is 42.9 per cent at a 95 per cent confidence interval.
Table 11.3.4
Variable
Total uncertainty in New Zealand’s estimates for afforestation/reforestation,
deforestation and forest management in 2013
Afforestation/reforestation uncertainty introduced into
emissions for Kyoto Protocol
Deforestation uncertainty introduced into emissions for
Kyoto Protocol
Forest management uncertainty introduced into emissions
for Kyoto Protocol
Uncertainty (%) at a 95% confidence interval
Total uncertainty for Kyoto Protocol 42.9
6.3
2.4
9.5
Other methodological issues
Quality control and quality assurance procedures have been adopted for all data collection
and data analyses, to be consistent with the IPCC guidelines General Guidance and
Reporting (IPCC, 2006b) and New Zealand’s inventory quality control and quality
assurance plan. Data-quality and data-assurance plans were established for each type of
data used to determine carbon stock and stock changes, as well as the areal extent and
spatial location of land-use changes. All data was subject to an independent and
documented quality-assurance process. Data validation rules and reports were established
to ensure that all data is fit for purpose, is of consistent and known quality, and that data
quality continues to be improved over time. The data used to derive the country-specific
yield tables and average carbon values have also undergone quality assurance as
described in section 6.4.4.
Year of the onset of an activity
Paragraph 18 of the annex to Decision 16/CMP.1 (Land Use, Land-Use Change and
Forestry) requires Parties to account for emissions and removals from Article 3.3
activities beginning with the onset of the activity or the beginning of the commitment
New Zealand’s Greenhouse Gas Inventory 1990–2013 351