集水区组成的季节变化及其对向波罗的海输送生物可利用碳的重要性

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2023-08-27 DOI:10.1007/s10533-023-01079-y
Kevin Jones, Martin Berggren, Johanna Sjöstedt
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引用次数: 0

摘要

陆地碳通过河流系统输送到沿海水域对沿海地区的氧气浓度有负面影响。然而,缺乏关于季节变化和集水区组成对异地碳生物利用度的影响的信息。在这个项目中,我们通过调查河口溶解有机碳(DOC)的反应性来解决这一知识差距,河口来源于农业或森林主导的集水区,历时一年。使用高容量氧传感系统测量生物需氧量(BOD),并将其转化为碳利用率。这使得了解总氮、总磷、DOC以及碳成分的浓度如何影响碳生物利用度具有必要的空间和时间分辨率。季节性和不同的集水区组成产生了不同的结果,关于哪些因素对反应性有显著贡献。此外,我们发现,大多数河流的碳利用率在4月、6月和10月最高。在1月、4月、6月和10月,与以森林为主的集水区相比,农业河流的生物可利用率(BFc)明显更高。然而,以农业为主的河流在8月份的碳利用率明显较高。这表明,以森林为主的河流输送了更大、更难处理的碳库,而以农业为主的集水区的河流的BFc比例更高。基于这些结果,我们认为,减少生物可利用碳运输的管理工作在春季和秋季将是最有效的,对集水区以农业和森林为主的河流同样重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Seasonal variation and importance of catchment area composition for transport of bioavailable carbon to the Baltic Sea

Transport of terrestrial carbon through riverine systems to coastal water has a negative impact on oxygen concentration in coastal areas. However, information on seasonal variation and the impact of catchment composition on the bioavailability of allochthonous carbon is lacking. In this project we address this knowledge gap by investigating the reactivity of dissolved organic carbon (DOC) at river mouths which originate from agricultural or forested dominated catchments over a year. Using a high-capacity oxygen sensing system biological oxygen demand (BOD) was measured and converted to carbon utilization rate. This allowed a spatial and temporal resolution necessary to understand how concentrations of total nitrogen, total phosphorus, DOC, as well as carbon composition influence carbon bioavailability. Seasonality and the differing catchment compositions yielded variable results about which factors were significantly contributing to reactivity. In addition, we found that carbon utilization rate was highest during April, June, and October for most rivers. The bioavailable fraction (BFc) was significantly higher in rivers with agricultural compared to forest dominated catchments during January, April, June, and October. However, rivers with agricultural dominated catchment had a significantly higher carbon utilization rate in August. This indicate that rivers dominated by forest transport larger and more refractory pools of carbon, while rivers with agricultural dominated catchments have a higher percentage of BFc. Based on these results we suggest that management efforts, to reduce the transport of bioavailable carbon, would be most efficient during spring and autumn with equal importance on rivers with catchment areas dominated by agriculture and forest.

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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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