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Maximum impacts of future reforestation or deforestation on atmospheric CO2

机译:未来的重新造林或毁林对大气CO2的最大影响

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There is scope for land-use changes to increase or decrease CO2 concentrations in the atmosphere over the next century. Here we make simple but robust calculations of the maximum impact of such changes. Historical land-use changes (mostly deforestation) and fossil fuel emissions have caused an increase in atmospheric concentration of CO2 of 90 ppm between the pre-industrial era and year 2000. The projected range of CO2 concentrations in 2100, under a range of emissions scenarios developed for the IPCC, is 170-600 ppm above 2000 levels. This range is mostly due to different assumptions regarding fossil fuel emissions. If all of the carbon so far released by land-use changes could be restored to the terrestrial biosphere, atmospheric CO2 concentration at the end of the century would be about 40-70 ppm less than it would be if no such intervention had occurred. Conversely, complete global deforestation over the same time frame would increase atmospheric concentrations by about 130-290 ppm. These are extreme assumptions; the maximum feasible reforestation and afforestation activities over the next 50 years would result in a reduction in CO2 concentration of about 15-30 ppm by the end of the century. Thus the time course of fossil fuel emissions will be the major factor in determining atmospheric CO2 concentrations for the foreseeable future. [References: 33]
机译:在下一世纪,土地用途的变化范围可以增加或减少大气中的二氧化碳浓度。在这里,我们对此类更改的最大影响进行了简单但可靠的计算。历史上的土地利用变化(主要是森林砍伐)和化石燃料的排放已导致工业化前时代和2000年之间大气中的CO2浓度增加了90 ppm。在各种排放情景下,预计2100年的CO2浓度范围为IPCC开发的产品比2000年水平高出170-600 ppm。该范围主要是由于有关化石燃料排放的不同假设。如果到目前为止,土地利用变化释放的所有碳都可以恢复到陆地生物圈,那么到本世纪末,大气中的二氧化碳浓度将比没有进行这种干预时的二氧化碳浓度低约40-70 ppm。相反,在同一时间框架内完全的全球森林砍伐将使大气浓度增加约130-290 ppm。这些是极端的假设;到本世纪末,未来50年最大的可行的造林和造林活动将导致二氧化碳浓度降低约15-30 ppm。因此,在可预见的将来,化石燃料排放的时程将成为确定大气中二氧化碳浓度的主要因素。 [参考:33]

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