Mao Jinhua, Burdett Heidi L, McGill Rona A R, Newton Jason, Gulliver Pauline, Kamenos Nicholas A
School of Geographical and Earth Sciences, University of Glasgow, Glasgow, UK.
Lyell Centre for Earth and Marine Science and Technology, Edinburgh, UK.
Glob Chang Biol. 2020 Apr;26(4):2496-2504. doi: 10.1111/gcb.15021. Epub 2020 Feb 26.
Carbon sequestration by sediments and vegetated marine systems contributes to atmospheric carbon drawdown, but little empirical evidence is available to help separate the effects of climate change and other anthropogenic activities on carbon burial over centennial timescales. We used marine sediment organic carbon to determine the role of historic climate variability and human habitation in carbon burial over the past 5,071 years. There was centennial-scale sensitivity of carbon supply and burial to climatic variability, with Little Ice Age cooling causing an abrupt ecosystem shift and an increase in marine carbon contributions compared to terrestrial carbon. Although land use changes during the late 1800s did not cause marked alteration in average carbon burial, they did lead to marked increases in the spatial variability of carbon burial. Thus, while carbon burial by vegetated systems is expected to increase with projected climate warming over the coming century, ecosystem restructuring caused by abrupt climate change may produce unexpected change in carbon burial whose variability is also modulated by land use change.
沉积物和植被丰富的海洋系统的碳固存有助于大气碳含量下降，但在百年时间尺度上，几乎没有实证证据能帮助区分气候变化和其他人类活动对碳埋藏的影响。我们利用海洋沉积物有机碳来确定历史气候变率和人类居住在过去5071年碳埋藏中的作用。碳供应和埋藏对气候变率具有百年尺度的敏感性，小冰期降温导致生态系统突然转变，与陆地碳相比，海洋碳的贡献增加。尽管19世纪后期的土地利用变化并未导致平均碳埋藏的显著改变，但确实导致了碳埋藏空间变率的显著增加。因此，虽然预计未来一个世纪植被系统的碳埋藏将随着气候变暖而增加，但突然气候变化导致的生态系统重组可能会使碳埋藏产生意想不到的变化，其变率也受到土地利用变化的调节。
