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Coastal wetland response to sea level rise in Connecticut and New York

机译：康涅狄格州和纽约州沿海湿地对海平面上升的反应

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The persistence of salt marshes in the landscape depends on their ability to accommodate rising sea level and minimize additional flooding stress. We use sediment cores and water level data from 14 marshes in Connecticut and New York to evaluate how marsh accretion, mineral and organic accumulation, carbon storage, and hydroperiod have changed from 1900 to 2012. We observe a regional acceleration in marsh accretion beginning around 1940, although marsh accretion did not reach parity with sea level rise for several additional decades. Despite a rise in marsh accretion from 1.0 mm yr(-1) circa 1900 to 3.6 mm yr(-1) at present, the marsh surface has lost elevation relative to tidal datums. Declining relative elevations have led to increased tidal flooding, particularly in high marsh settings. As flooding increased, organic matter accumulation accelerated at all marshes. Accelerating mineral deposition was only observed in areas of short-form Spartina alterniflora. Mineral and organic sediment accumulation co-limit accretion, but organic accumulation was the stronger limiting factor, suggesting that marsh response to sea level rise in the region is sensitive to processes affecting rates of belowground production and decomposition. Marsh carbon storage over the period of study averaged 84 g C m(-2) yr(-1), increasing as accretion accelerated. If marshes remain spatially intact as sea levels rise, these results suggest that marshes have the capacity to become even greater C sinks. (c) 2015 Elsevier Ltd. All rights reserved.
机译：盐沼在景观中的持久性取决于它们适应海平面上升并最大程度降低额外洪水压力的能力。我们使用康涅狄格州和纽约州14座沼泽的沉积物核心和水位数据来评估1900年至2012年间沼泽沉积，矿物质和有机累积，碳储量和水周期的变化。我们观察到1940年左右开始沼泽沉积的区域加速，尽管在过去的几十年中，沼泽的积聚与海平面的上升并没有达到平价。尽管沼泽堆积物从大约1900年的1.0 mm yr（-1）上升到目前的3.6 mm yr（-1），但相对于潮汐基准而言，沼泽地表的海拔却有所下降。相对海拔的降低导致潮汐泛滥的加剧，特别是在高沼泽地带。随着洪水的增加，所有沼泽的有机物积累都在加速。仅在短形互花米草的区域中观察到加速的矿物沉积。矿物质和有机沉积物的积累共同限制了增生，但有机积累是更强的限制因素，这表明该地区对海平面上升的沼泽响应对影响地下生产和分解速率的过程很敏感。在研究期间，沼泽碳储量平均为84 g C m（-2）yr（-1），随着吸积加速而增加。如果随着海平面上升，沼泽在空间上保持完好无损，则这些结果表明，沼泽有能力成为更大的碳汇。 （c）2015 Elsevier Ltd.保留所有权利。

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