Seasonal Variations of Dissolved Iron Concentration in Active Layer and Rivers in Permafrost Areas, Russian Far East
Dissolved iron (dFe) in boreal rivers may play an important role in primary production in high-latitude oceans. However, iron behavior in soils and dFe discharge mechanism from soil to the rivers are poorly understood. To better understand iron dynamics on the watershed scale, we observed the season...
Published in: | Water |
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Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
MDPI AG
2020
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Subjects: | |
Online Access: | https://doi.org/10.3390/w12092579 https://doaj.org/article/5f79f722fa574ac68c822c51c29dae8f |
Summary: | Dissolved iron (dFe) in boreal rivers may play an important role in primary production in high-latitude oceans. However, iron behavior in soils and dFe discharge mechanism from soil to the rivers are poorly understood. To better understand iron dynamics on the watershed scale, we observed the seasonal changes in dFe and Dissolved Organic Carbon (DOC) concentrations in the river as well as dFe concentration in soil pore waters in permafrost watershed from May to October. During snowmelt season, high dFe production (1.38–4.70 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> ) was observed in surface soil pore waters. Correspondingly, riverine dFe and DOC concentrations increased to 1.10 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> and 32.3 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> , and both were the highest in the year. After spring floods, riverine dFe and DOC concentrations decreased to 0.15 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> and 7.62 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> , and dFe concentration in surface soil pore waters also decreased to 0.20–1.28 mg L <math ... |
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