Latitudinal limits to the predicted increase of the peatland carbon sink with warming
Latitudinal limits to the predicted increase of the peatland carbon sink with warming
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DOI：
10.1038/s41558-018-0271-1
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发表时间：
2018-10-01
影响因子：
30.7
通讯作者：
Zhao, Yan
中科院分区：
文献类型：
--
作者：
Gallego-Sala, Angela, V;Charman, Dan J.;Zhao, Yan
泥炭地的碳汇潜力取决于植物吸收碳和微生物分解的平衡。这两个过程的速率都将随着变暖而增加，但目前尚不清楚哪一个将主导全球泥炭地的反应。在这里，我们研究了过去一千年泥炭地碳积累速率与行星尺度气候空间之间的全球关系。两半球中高纬度泥炭地生长季碳积累与累积光合有效辐射呈正相关。然而，这种关系在低纬度地区则相反，这表明在最温暖的气候条件下，碳积累较低。代表性浓度路径（RCP）2.6和RCP8.5情景下的预估表明，目前的全球碳汇在公元2100年前后将略有增加，但此后将下降。泥炭地在未来仍将是碳汇，但它们对气候变暖的反应在21世纪末从负反馈转变为正反馈（碳汇随着变暖而减少）。
The carbon sink potential of peatlands depends on the balance of carbon uptake by plants and microbial decomposition. The rates of both these processes will increase with warming but it remains unclear which will dominate the global peatland response. Here we examine the global relationship between peatland carbon accumulation rates during the last millennium and planetary-scale climate space. A positive relationship is found between carbon accumulation and cumulative photosynthetically active radiation during the growing season for mid- to high-latitude peatlands in both hemispheres. However, this relationship reverses at lower latitudes, suggesting that carbon accumulation is lower under the warmest climate regimes. Projections under Representative Concentration Pathway (RCP)2.6 and RCP8.5 scenarios indicate that the present-day global sink will increase slightly until around AD 2100 but decline thereafter. Peatlands will remain a carbon sink in the future, but their response to warming switches from a negative to a positive climate feedback (decreased carbon sink with warming) at the end of the twenty-first century.