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首页> 外文期刊>Estuarine Coastal and Shelf Science >Salt marsh ecosystem restructuring enhances elevation resilience and carbon storage during accelerating relative sea-level rise
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Salt marsh ecosystem restructuring enhances elevation resilience and carbon storage during accelerating relative sea-level rise

机译：盐沼生态系统重组在加速相对海平面上升的过程中增强了海拔弹性和碳储量

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摘要

Salt marshes respond to sea-level rise through a series of complex and dynamic bio-physical feedbacks. In this study, we found that sea-level rise triggered salt marsh habitat restructuring, with the associated vegetation changes enhancing salt marsh elevation resilience. A continuous record of marsh elevation relative to sea level that includes reconstruction of high-resolution, sub-decadal, marsh elevation over the past century, coupled with a lower-resolution 1500-year record, revealed that relative sea-level rose 1.5 +/- 0.4 m, following local glacial isostatic adjustment (1.2 mm/yr). As sea-level rise has rapidly accelerated, the high marsh zone dropped 11 cm within the tidal frame since 1932, leading to greater inundation and a shift to flood- and salt-tolerant low marsh species. Once the marsh platform fell to the elevation favored by low-marsh Spartina alterniflara, the elevation stabilized relative to sea level. Currently low marsh accretion keeps pace with sea-level rise, while present day high marsh zones that have not transitioned to low marsh have a vertical accretion deficit. Greater biomass productivity, and an expanding subsurface accommodation space favorable for salt marsh organic matter preservation, provide a positive feed-back between sea-level rise and marsh platform elevation. Carbon storage was 46 +/- 28 g C/m(2)/yr from 550 to 1800 CE, increasing to 129 +/- 50 g C/m(2)/yr in the last decade. Enhanced carbon storage is controlled by vertical accretion rates, rather than soil carbon density, and is a direct response to anthropogenic eustatic sea-level rise, ultimately providing a negative feedback on climate warming.
机译：盐沼通过一系列复杂而动态的生物物理反馈来响应海平面上升。在这项研究中，我们发现海平面上升触发了盐沼栖息地的重建，相关的植被变化增强了盐沼海拔的适应能力。连续记录沼泽相对于海平面的高度，包括对过去一个世纪的高分辨率，年代际，沼泽高度的重建，以及较低分辨率的1500年记录，表明相对海平面上升了1.5 + / -局部冰川等静压调整后为0.4 m（1.2毫米/年）。由于海平面上升迅速加快，自1932年以来，高沼泽地带在潮汐框架内下降了11厘米，导致洪水泛滥，并转向了耐洪和耐盐的低沼泽物种。一旦沼泽平台降到低沼泽互花米草（Spartina alterniflara）青睐的海拔高度，海拔高度就相对于海平面稳定了。当前，低沼泽的增生与海平面上升保持同步，而当今尚未过渡到低沼泽的高沼泽地带则存在垂直的增生赤字。更高的生物量生产力，以及有利于盐沼有机物保存的扩大的地下容纳空间，在海平面上升和沼泽平台高程之间提供了积极的反馈。从550到1800 CE，碳存储量为46 +/- 28 g C / m（2）/年，在最近十年中增加到129 +/- 50 g C / m（2）/年。碳储存量的增加是由垂直吸积率控制的，而不是土壤碳的密度，它是对人为的欢乐海平面上升的直接反应，最终对气候变暖提供了负面反馈。

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