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首页> 外文期刊>Estuaries and coasts >Comparing the Biogeochemistry of Storm Surge Sediments and Pre-storm Soils in Coastal Wetlands: Hurricane Irma and the Florida Everglades
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Comparing the Biogeochemistry of Storm Surge Sediments and Pre-storm Soils in Coastal Wetlands: Hurricane Irma and the Florida Everglades

机译：比较沿海湿地风暴浪涌沉积物的生物态化和暴风雨预防土壤：飓风IRMA与佛罗里达沼泽地

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Hurricanes can alter the rates and trajectories of biogeochemical cycling in coastal wetlands. Defoliation and vegetation death can lead to increased soil temperatures, and storm surge can variously cause erosion or deposition of sediment leading to changes in soil bulk density, nutrient composition, and redox characteristics. The objective of this study was to compare the biogeochemistry of pre-storm soils and a carbonate-rich sediment layer deposited by Hurricane Irma that made landfall in southwest Florida as a category 3 storm in September 2017. We predicted that indicators of biogeochemical activity (e.g., potential soil respiration rates, microbial biomass (MBC), and extracellular enzyme activities) would be lower in the storm sediment layer because of its lower organic matter content relative to pre-storm soils. There were few differences between the storm sediment and pre-storm soils at two of the sites closest to the Gulf of Mexico (GOM). This suggests that marine deposition regularly influences soil formation at these sites and is not something that occurs only during hurricanes. At a third site, 8 km from the GOM, the pre-storm soils had much greater concentrations of organic matter, total N, total P, MBC, and higher potential respiration rates than the storm layer. At this same site, CO2 fluxes from intact soil cores containing a layer of storm sediment were 30% lower than those without it. This suggests that sediment deposition from storm surge has the potential to preserve historically sequestered carbon in coastal soils through reduced respiratory losses.
机译：飓风可以改变沿海湿地生物地球化学循环的速度和轨迹。落叶和植被死亡可能导致土壤温度提高，风暴浪涌可能会发生侵蚀或沉积沉积，导致土壤堆积密度，营养成分和氧化还原特性的变化。本研究的目的是比较暴雨前土壤的生物地球化学和富飓风IRMA沉积的碳酸盐沉积物层，在2017年9月，佛罗里达州西南西南部地区的登陆量。我们预测了生物地球化学活动的指标（例如由于其相对于暴雨前污垢的有机质含量较低，潜在的土壤呼吸速率，微生物生物量（MBC）和细胞外酶活性在暴风雨层中会降低。在最接近墨西哥湾（GOM）的两个网站的风暴沉积物和暴雨前土壤之间存在差异很少。这表明海洋沉积定期影响这些位点的土壤形成，并且不是在飓风期间发生的东西。在第三种地点，距离GOM 8公里，预暴风尘的土壤具有更大的有机物浓度，总N，总P，MBC和比风暴层更高的潜在呼吸率。在此同一部位，来自含有一层风暴沉积物层的完整土壤芯的CO 2助熔剂比没有它的那些含量低30％。这表明来自风暴浪涌的沉积物沉积有可能通过降低呼吸损失来保护沿海土壤中的历史上隔离的碳。

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