The University of Sydney, School of Geosciences, NSW 2006, Australia.
The University of Sydney, School of Geosciences, NSW 2006, Australia.
Mar Pollut Bull. 2021 May;166:112219. doi: 10.1016/j.marpolbul.2021.112219. Epub 2021 Mar 6.
Mangrove environments are important for maintaining biodiversity and carbon cycling. However, these systems are being degraded at alarming rates around the world, particularly in rapidly developing regions. Here, we examine a sediment profile from a mangrove forest near a large port complex at Suape, northeast Brazil, in order to assess the impact of rapid urbanization and industrialization. We find that total organic carbon (TOC) and total nitrogen (TN) accumulation rates have increased in the estuary since the 1980's, directly related to rapid urban development. The TN and heavy δN values in the sediment column suggest increasing anthropogenic influences. In contrast, heavy metal fluxes did not increase during these transitions. The increase in TOC and TN accumulation rates during the past four decades highlight the significant role mangrove areas play as sinks for anthropogenically enhanced nutrients in poorly-understood tropical areas.
红树林环境对于维护生物多样性和碳循环至关重要。然而，在世界各地，这些系统正在以惊人的速度退化，特别是在快速发展的地区。在这里，我们研究了巴西东北部苏阿佩大型港口综合体附近红树林中的一个沉积剖面，以评估快速城市化和工业化的影响。我们发现，自 20 世纪 80 年代以来，河口处的总有机碳（TOC）和总氮（TN）积累速率增加，这与快速的城市发展直接相关。沉积物柱中的 TN 和重 δN 值表明人为影响不断增加。相比之下，重金属通量在这些转变过程中并未增加。过去四十年中 TOC 和 TN 积累速率的增加突出表明，红树林地区在人们对营养物质认识不足的热带地区充当了人为增强养分的汇。
