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Temporal records of organic carbon stocks and burial rates in Mexican blue carbon coastal ecosystems throughout the Anthropocene
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.gloplacha.2020.103215
Tomasa Cuellar-Martinez , Ana Carolina Ruiz-Fernández , Joan-Albert Sanchez-Cabeza , Libia Pérez-Bernal , Perla Guadalupe López-Mendoza , Vladislav Carnero-Bravo , Claudia Maricusa Agraz-Hernández , Brigitta Ine van Tussenbroek , Jose Sandoval-Gil , José Gilberto Cardoso-Mohedano , Yosahandy Vázquez-Molina , Giovanni Aldana-Gutiérrez

Abstract Blue carbon (BC) ecosystems provide important and multiple ecosystem services, including climate change mitigation through carbon storage. However, these ecosystems are under the pressure of numerous anthropogenic stressors, such as population growth and industrialization, which jeopardize the benefits they provide. Although the common methodology is based on the use of a linear depth scale, this work highlights the need of sediment dating to evaluate temporal variation of organic carbon (Corg) stocks and burial rates, since sedimentation patterns can be variable even between sites within a single ecosystem. Temporal records of Corg stocks and burial rates during the past 100 years were determined in mangrove, seagrass and salt marsh ecosystems, from five representative areas of the Mexican marine coastal systems, by using 210Pb-dated sediment cores. Carbon stocks during the past 100 years (Corg stock(100 years)) ranged from 67 to 269 Mg Corg ha−1 in mangroves, 8–53 Mg Corg ha−1 in seagrasses and 32–56 Mg Corg ha−1 in salt marshes, and burial rates were 8–426 g m−2 yr−1, 2–252 g m−2 yr−1 and 1–60 g m−2 yr−1, respectively. Most of the stored Corg (60–86%) accumulated during the Anthropocene (since 1950), and in mangrove cores recent Corg stocks were up to six times higher than before the Anthropocene onset (1900–1950), most likely as a result of land use changes. Increased Corg burial rates in seagrass ecosystems were mostly driven by mass accumulation rate changes (promoted by catchment erosion and sea level rise), and in mangroves and salt marshes by changes in Corg content, likely promoted by an increase in productivity associated with nutrient enrichment by fertilizer runoff and sewage disposal. Despite the multiple anthropogenic stressors that positively affected Corg stocks and burial rates in BC ecosystems, worldwide destruction of these valuable habitats will cause losses of long-term buried Corg through significant CO2 releases, thus conservation and/or restoration are effective actions for climate change mitigation.

中文翻译:

整个人类世墨西哥蓝碳沿海生态系统中有机碳储量和埋藏率的时间记录

摘要 蓝碳 (BC) 生态系统提供重要的多种生态系统服务,包括通过碳储存减缓气候变化。然而,这些生态系统面临着人口增长和工业化等众多人为压力因素的压力,从而危及它们提供的利益。虽然常用的方法是基于线性深度尺度的使用,但这项工作强调了沉积物测年的必要性,以评估有机碳 (Corg) 储量和埋藏率的时间变化,因为沉积模式即使在单个地点之间也可能发生变化。生态系统。过去 100 年中珊瑚种群和埋藏率的时间记录是在墨西哥海洋沿海系统的五个代表性区域的红树林、海草和盐沼生态系统中确定的,通过使用 210Pb 测年的沉积物岩心。过去 100 年的碳储量(Corg 储量(100 年))在红树林中为 67 至 269 Mg Corg ha−1,在海草中为 8~53 Mg Corg ha−1,在盐沼中为 32~56 Mg Corg ha−1和埋藏率分别为 8–426 gm-2 yr-1、2–252 gm-2 yr-1 和 1–60 gm-2 yr-1。大多数储存的 Corg(60-86%)在人类世(自 1950 年以来)积累,在红树林核心中,最近的 Corg 存量比人类世开始前(1900-1950)高出六倍,很可能是由于土地利用变化。海草生态系统中 Corg 埋藏率的增加主要是由质量积累率变化(由集水侵蚀和海平面上升推动)以及红树林和盐沼中 Corg 含量的变化驱动的,可能是由于肥料径流和污水处理造成的养分富集相关的生产力提高。尽管多种人为压力因素对 BC 生态系统中的 Corg 种群和埋藏率产生了积极影响,但这些宝贵栖息地的全球破坏将通过大量二氧化碳释放导致长期埋藏的 Corg 损失,因此保护和/或恢复是缓解气候变化的有效行动.
更新日期:2020-09-01
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