Response of salt-marsh carbon accumulation to climate change
Response of salt-marsh carbon accumulation to climate change
复制标题
DOI：
10.1038/nature11440
复制
发表时间：
2012-09-27
期刊：
影响因子：
64.8
通讯作者：
Mudd, Simon M.
中科院分区：
文献类型：
--
作者：
Kirwan, Matthew L.;Mudd, Simon M.
每年约有一半的海洋碳埋藏发生在浅水生态系统中，那里的地貌和生态稳定是由水流、植被生长和沉积物运输之间的相互作用驱动的(1)。尽管陆地和深海碳库对气候变化的敏感性已经研究了几十年，但人们对沿海碳积累率如何变化及其对气候的潜在反馈知之甚少（2,3）。在这里，我们开发了一个盐沼演变的数值模型，通过最近的生产力和分解测量，并证明矿物沉积物沉积和有机质积累之间的竞争决定了气候变化对潮间带湿地碳积累的净影响。研究发现，气候变暖对土壤碳积累速率的直接影响比气候变暖驱动的海平面上升的影响更微妙，尽管气候变暖的影响随着海平面上升速度的增加而增加。我们的模拟表明，气候变化的净影响将是在21世纪上半叶增加碳埋藏率，但碳-气候反馈可能会随着时间的推移而减弱。
About half of annual marine carbon burial takes place in shallow water ecosystems where geomorphic and ecological stability is driven by interactions between the flow of water, vegetation growth and sediment transport(1). Although the sensitivity of terrestrial and deep marine carbon pools to climate change has been studied for decades, there is little understanding of how coastal carbon accumulation rates will change and potentially feed back on climate(2,3). Here we develop a numerical model of salt marsh evolution, informed by recent measurements of productivity and decomposition, and demonstrate that competition between mineral sediment deposition and organic-matter accumulation determines the net impact of climate change on carbon accumulation in intertidal wetlands. We find that the direct impact of warming on soil carbon accumulation rates is more subtle than the impact of warming-driven sea level rise, although the impact of warming increases with increasing rates of sea level rise. Our simulations suggest that the net impact of climate change will be to increase carbon burial rates in the first half of the twenty-first century, but that carbon-climate feedbacks are likely to diminish over time.