Temporal variability of carbon and nutrient burial, sediment accretion, and mass accumulation over the past century in a carbonate platform mangrove forest of the Florida Everglades
Temporal variability of carbon and nutrient burial, sediment accretion, and mass accumulation over the past century in a carbonate platform mangrove forest of the Florida Everglades
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DOI：
10.1002/2014jg002715
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发表时间：
2014-10-01
影响因子：
3.7
通讯作者：
Sanders, Christian J.
中科院分区：
文献类型：
--
作者：
Breithaupt, Joshua L.;Smoak, Joseph M.;Sanders, Christian J.
本研究的目的是测量过去一个世纪以来，美国大沼泽地国家公园鲨鱼河红树林中沉积和质量沉积速率(包括有机碳(OC)、总氮(TN)和总磷(TP))的时间变异性。铅-210恒定供应速率模型被应用于6个土壤岩心，以计算最近10年、50年和100年时间跨度的年增长率。我们的结果表明，在较长的时间范围内积分的比率低于较短的近期观察期间的比率。此外，在100年期间，核心之间的巨大空间变异性在100年的记录中减小，这提出了两个重要的影响。首先，对土壤堆积和有机碳埋藏的数十年评估提供了一个更保守的估计，很可能是相对于海平面上升和气候变化缓解的长期过程预测这些速率的最相关的。其次，与较短的周期相比，少量的采样位置能够更好地解释较长周期的空间变异性。现场100a的OC埋藏率为12319(标准差)g m(-2)yr(-1)，与全球红树林的埋藏率相比是低的。近几十年来较高的TN和TP埋藏率可能导致土壤碳再矿化增加，从而导致较低的碳埋藏率。最后，有机碳埋藏和整个场地的堆积之间的强烈相关性表明，除了二氧化碳封存的生态系统服务外，有机碳还对土壤建设做出了重大贡献。
The objective of this research was to measure temporal variability in accretion and mass sedimentation rates (including organic carbon (OC), total nitrogen (TN), and total phosphorous (TP)) from the past century in a mangrove forest on the Shark River in Everglades National Park, USA. The Pb-210 Constant Rate of Supply model was applied to six soil cores to calculate annual rates over the most recent 10, 50, and 100 year time spans. Our results show that rates integrated over longer timeframes are lower than those for shorter, recent periods of observation. Additionally, the substantial spatial variability between cores over the 10 year period is diminished over the 100 year record, raising two important implications. First, a multiple-decade assessment of soil accretion and OC burial provides a more conservative estimate and is likely to be most relevant for forecasting these rates relative to long-term processes of sea level rise and climate change mitigation. Second, a small number of sampling locations are better able to account for spatial variability over the longer periods than for the shorter periods. The site average 100year OC burial rate, 12319 (standard deviation) g m(-2)yr(-1), is low compared with global mangrove values. High TN and TP burial rates in recent decades may lead to increased soil carbon remineralization, contributing to the low carbon burial rates. Finally, the strong correlation between OC burial and accretion across this site signals the substantial contribution of OC to soil building in addition to the ecosystem service of CO2 sequestration.