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Agents of change and temporal nutrient dynamics in the Altamaha River Watershed

机译：阿尔塔马哈河流域的变化和时间养分动态的动因

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Nutrient and carbon dynamics in river ecosystems are shifting, and climate change is likely a driving factor; however, some previous studies indicate anthropogenic modification of natural resources may supersede the effects of climate. To understand temporal changes in river ecosystems, consideration of how these agents act independently and collectively to affect watershed biogeochemistry is necessary. Through the Georgia Coastal Ecosystems Long‐Term Ecological Research Project, we assessed nutrient (phosphorus, nitrogen, silicate) and carbon dynamics, with specific regard to import and export, in the Altamaha River Basin from 2000 to 2012. This is the first study in the region to document the biogeochemical patterns in the Altamaha's four main tributaries, the Little Ocmulgee, Ocmulgee, Oconee, and Ohoopee rivers, and the relationships between biogeochemistry and historical precipitation and discharge patterns as well as agricultural and population census data. As discharge patterns are a primary driver of nutrient loads, we determined that water use was a dominant factor in the shifting ecosystem dynamics. Dissolved inorganic nitrogen loads were primarily driven by population density and dissolved inorganic phosphorus loads were strongly influenced by livestock biomass. Taken together, we conclude that both the transportation and biogeochemical cycling of nutrients within the Altamaha River Watershed were highly impacted by anthropogenic influences, which were then further exacerbated by continued climate change. Furthermore, the N‐ and P‐loads in the Altamaha River and tributaries were dominated by dissolved organic nitrogen and dissolved organic phosphorus, emphasizing a need to further study the bioavailability of these species and the mechanisms driving their potential ecological impacts.
机译：河流生态系统中的营养和碳动态正在发生变化，气候变化可能是驱动因素;但是，先前的一些研究表明，人为改变自然资源可能会取代气候的影响。为了了解河流生态系统的时间变化，有必要考虑这些因素如何独立和共同作用以影响流域生物地球化学。通过佐治亚州沿海生态系统长期生态研究项目，我们评估了2000年至2012年阿尔塔马哈河流域的养分（磷，氮，硅酸盐）和碳动态，特别是进出口情况。这是墨西哥的第一项研究。该区域记录了Altamaha的四个主要支流，小Ocmulgee，Ocmulgee，Oconee和Ohoopee河流中的生物地球化学模式，以及生物地球化学与历史降水和流量模式之间的关系以及农业和人口普查数据。由于排放方式是养分负荷的主要驱动力，我们确定用水是生态系统动态变化的主要因素。溶解的无机氮负荷主要受种群密度驱动，而溶解的无机磷负荷受牲畜生物量的强烈影响。综上所述，我们得出的结论是，人为因素极大地影响了Altamaha河流域内养分的运输和生物地球化学循环，随后气候变化持续加剧了这一影响。此外，阿尔塔马哈河和支流中的氮和磷负荷以溶解的有机氮和溶解的有机磷为主，强调需要进一步研究这些物种的生物利用度及其驱动潜在生态影响的机制。

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