摘要
这项研究采用生命周期分析来探讨加拿大1990～2000年间泥炭工业温室气体(GHG)净排放量.GHG交换通过土地利用变化、泥炭开采、处理、运输到市场,以及开采的泥炭原地分解来估算.根据一个累积GHG计算模型估计显示,1990年泥炭开采生命周期中排放GHG 0.54×106t,到2000年,增加到O.89×106t(以CO2当量表示,在100年时间水平下).与最终利用相关的泥炭分解是GHG最大的排放源,在11年中,占总排放量的71%.土地利用变化导致了泥炭田由GHG汇转变为源,占了15%的份额.泥炭运输占据了GHG总排放量的10%,开采和加工占4%.如果泥炭田恢复成功,并且被完全开采了的泥炭田重新成为净碳汇,碳库恢复到原来水平也大概得需要2000年时间.
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 3106 t of GHG in 1990, increasing to 0.893106 tin 2000 (expressed as CO_2 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 onginal size if peatland restoration is successful and the cutover peatland once again becomes a net carbon sink.
