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| Main Authors: | , , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2018
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| Online Access: | https://doi.org/10.1594/PANGAEA.895676 |
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| _version_ | 1867168195877535744 |
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| author | Haas, Mischa Baumann, Franziska Castella, Daniel Haghipour, Negar Reusch, Anna Strasser, Michael Eglinton, Timothy Ian Dubois, Nathalie |
| author_facet | Haas, Mischa Baumann, Franziska Castella, Daniel Haghipour, Negar Reusch, Anna Strasser, Michael Eglinton, Timothy Ian Dubois, Nathalie |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Land cover transformations have accompanied the rise and fall of civilizations for thousands of years, exerting strong influence on the surrounding environment. Soil erosion and the associated outwash of nutrients are a main cause of eutrophication of aquatic ecosystems. Despite the great challenges of water protection in the face of climate change, large uncertainties remain concerning the timescales for recovery of aquatic ecosystems impacted by hypoxia. This study seeks to address this issue by investigating the sedimentary record of Lake Murten (Switzerland), which witnessed several phases of intensive human land-use over the past 2000 years. Application of geophysical and geochemical methods to a 10 m-long sediment core revealed that soil erosion increased drastically with the rise of the Roman City of Aventicum (30 CE). During this period, the radiocarbon age of the bulk sedimentary organic carbon (OC) increasingly deviated from the modeled deposition age, indicating rapid flushing of old soil OC from the surrounding catchment driven by intensive land-use. Enhanced nutrient delivery resulted in an episode of cultural eutrophication, as shown by the deposition of varved sediments. Human activity drastically decreased towards the end of the Roman period (3rd century CE), resulting in land abandonment and renaturation. Recovery of the lake ecosystem from bottom-water hypoxia after the peak in human activity took around 50 years, while approximately 300 years passed until sediment accumulation reached steady state conditions on the surrounding landscape. These findings suggest that the legacy of anthropogenic perturbation to watersheds may persist for centuries. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_895676 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geophysical and geochemical parameters determined in a sediment core LM13KB2 from Lake Murten, Switzerland Haas, Mischa Baumann, Franziska Castella, Daniel Haghipour, Negar Reusch, Anna Strasser, Michael Eglinton, Timothy Ian Dubois, Nathalie Accumulation rate, sediment, mean per year; Age; AGE; Age, 14C calibrated, IntCal13 (Reimer et al., 2013); Biogenic silica; Caesium-137; Calcium; Calculated; Calendar age, maximum/old; Calendar age, minimum/young; Carbon, organic, total; Carbon/Nitrogen ratio; Density, wet bulk; DEPTH, sediment/rock; Element analyser Euro EA 3000; Element analyser isotope ratio mass spectrometer (EA-IRMS); Gamma spectroscopy; Iron; KULC; KULLENBERG corer; Lake Murten; Lead; Lead-210 excess; LM13KB2; Magnetic susceptibility; Manganese; Multi-Sensor Core Logger (MSCL), GEOTEK; Nitrogen, total; Potassium; Sedimentation rate per year; Stratigraphy; Time in years; Titanium; X-ray fluorescence core scanner (XRF), Avaatech; δ13C, organic carbon; δ15N, bulk sediment Land cover transformations have accompanied the rise and fall of civilizations for thousands of years, exerting strong influence on the surrounding environment. Soil erosion and the associated outwash of nutrients are a main cause of eutrophication of aquatic ecosystems. Despite the great challenges of water protection in the face of climate change, large uncertainties remain concerning the timescales for recovery of aquatic ecosystems impacted by hypoxia. This study seeks to address this issue by investigating the sedimentary record of Lake Murten (Switzerland), which witnessed several phases of intensive human land-use over the past 2000 years. Application of geophysical and geochemical methods to a 10 m-long sediment core revealed that soil erosion increased drastically with the rise of the Roman City of Aventicum (30 CE). During this period, the radiocarbon age of the bulk sedimentary organic carbon (OC) increasingly deviated from the modeled deposition age, indicating rapid flushing of old soil OC from the surrounding catchment driven by intensive land-use. Enhanced nutrient delivery resulted in an episode of cultural eutrophication, as shown by the deposition of varved sediments. Human activity drastically decreased towards the end of the Roman period (3rd century CE), resulting in land abandonment and renaturation. Recovery of the lake ecosystem from bottom-water hypoxia after the peak in human activity took around 50 years, while approximately 300 years passed until sediment accumulation reached steady state conditions on the surrounding landscape. These findings suggest that the legacy of anthropogenic perturbation to watersheds may persist for centuries. |
| title | Geophysical and geochemical parameters determined in a sediment core LM13KB2 from Lake Murten, Switzerland |
| topic | Accumulation rate, sediment, mean per year; Age; AGE; Age, 14C calibrated, IntCal13 (Reimer et al., 2013); Biogenic silica; Caesium-137; Calcium; Calculated; Calendar age, maximum/old; Calendar age, minimum/young; Carbon, organic, total; Carbon/Nitrogen ratio; Density, wet bulk; DEPTH, sediment/rock; Element analyser Euro EA 3000; Element analyser isotope ratio mass spectrometer (EA-IRMS); Gamma spectroscopy; Iron; KULC; KULLENBERG corer; Lake Murten; Lead; Lead-210 excess; LM13KB2; Magnetic susceptibility; Manganese; Multi-Sensor Core Logger (MSCL), GEOTEK; Nitrogen, total; Potassium; Sedimentation rate per year; Stratigraphy; Time in years; Titanium; X-ray fluorescence core scanner (XRF), Avaatech; δ13C, organic carbon; δ15N, bulk sediment |
| url | https://doi.org/10.1594/PANGAEA.895676 |