ghg-inventory-1990-2013

Harvest of afforestation and reforestation land is estimated from 1990 onwards. These
lands provide a small contribution to harvested wood products because the majority of
post-1989 planted forests are yet to reach harvest age. Harvested wood products
originating from these lands are estimated by prorating the proportion of afforestation and
reforestation harvest emissions to total harvest emissions (excluding deforestation).
Harvest on forest management land, specifically pre-1990 planted forest, is estimated
from 2013 onwards, and these lands currently provide over 90 per cent of New Zealand’s
annual harvest. Harvested wood products originating from these lands are estimated by
prorating the proportion of forest management harvest emissions to total harvest
emissions (excluding deforestation). Accounting of harvested wood products on these
lands is against New Zealand’s projected FMRL and, therefore, emissions prior to 2013
are excluded.
Harvested wood products originating from deforestation are instantly emitted under the
Kyoto Protocol; however, the production statistics do not identify removals from these
lands. The share of harvest volume originating from deforestation is estimated by
comparing emissions from deforestation to emissions from harvesting. This provides a
proportion to apply to the production statistics to separate harvested wood products
originating from deforestation.
Non-forest harvest is treated as an instant emission. Harvest from these lands is assumed
to be used for fuel wood. Therefore, the harvested wood products contribution from nonforest
lands is assumed to be zero.
Non-CO 2 emissions
Direct N 2 O emissions from nitrogen fertilisation (CRF 4(KP-II)1)
New Zealand’s activity data on nitrogen fertilisation is not currently disaggregated by
land use, therefore, all N 2 O emissions from nitrogen fertilisation are reported in the
Agriculture sector under the category ‘direct soils emissions’ (CRF 4D). The notation key
IE (included elsewhere) is reported in the CRF tables for the KP-LULUCF sector.
CH 4 and N 2 O emissions from drained and rewetted organic soils (CRF 4(KP-II)2)
The methodology for estimating these emissions is contained within the 2013 Supplement
to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories: Wetlands (IPCC,
2014b). This supplement was not adopted by the CMP and, as such, its use is voluntary
unless a country has elected Wetland Drainage and Rewetting. 44 Given this, New Zealand
reports NE (not estimated) in the CRF table for CH4 and N 2 O emissions from drained
and rewetted organic soils.
Nitrous oxide emissions from nitrogen mineralisation and immobilisation
associated with land-use conversions and management in mineral soils
(CRF 4(KP-II)3)
Nitrous oxide emissions, resulting from nitrogen mineralisation and immobilisation
associated with land conversion, are reported for afforestation and reforestation,
deforestation and forest management. These are calculated following the guidance in the
IPCC Guidelines for National Greenhouse Gas Inventories (IPCC, 2006a). Total
emissions for these three activities are 0.04 kt N 2 O.
44
Decision 6/CMP.9, paragraph 10.
344 New Zealand’s Greenhouse Gas Inventory 1990–2013