Cleary Julian, Roulet Nigel T, Moore Tim R
Department of Geography, University of Toronto, Ontario, Canada.
Ambio. 2005 Aug;34(6):456-61.
This study uses life-cycle analysis to examine the net greenhouse gas (GHG) emissions from the Canadian peat industry for the period 1990-2000. GHG exchange is estimated for land-use change, peat extraction and processing, transport to market, and the in situ decomposition of extracted peat. The estimates, based on an additive GHG accounting model, show that the peat extraction life cycle emitted 0.54 x 10(6) t of GHG in 1990, increasing to 0.89 x 10(6) t in 2000 (expressed as CO2 equivalents using a 100-y time horizon). Peat decomposition associated with end use was the largest source of GHGs, comprising 71% of total emissions during this 11-y period. Land use change resulted in a switch of the peatlands from a GHG sink to a source and contributed an additional 15%. Peat transportation was responsible for 10% of total GHG emissions, and extraction and processing contributed 4%. It would take approximately 2000 y to restore the carbon pool to its original size if peatland restoration is successful and the cutover peatland once again becomes a net carbon sink.
本研究采用生命周期分析方法，考察了1990 - 2000年期间加拿大泥炭产业的温室气体净排放量。估算了土地利用变化、泥炭开采与加工、运输至市场以及开采泥炭的原位分解过程中的温室气体交换量。基于一个累加的温室气体核算模型的估算结果表明，泥炭开采生命周期在1990年排放了0.54×10⁶吨温室气体，到2000年增至0.89×10⁶吨（以100年时间跨度的二氧化碳当量表示）。与最终用途相关的泥炭分解是温室气体的最大来源，在这11年期间占总排放量的71%。土地利用变化导致泥炭地从温室气体汇转变为源，额外贡献了15%。泥炭运输占温室气体总排放量的10%，开采与加工贡献了4%。如果泥炭地恢复成功且开垦后的泥炭地再次成为净碳汇，将碳库恢复到原来的规模大约需要2000年。
