Plant organic matter mobilization and export in fluvial systems
The global carbon cycle is closely linked to Earth’s climate. In the context of continuously unchecked anthropogenic CO₂ emissions, the importance of natural CO₂ bond and carbon storage is increasing. An important biogenic mechanism of natural atmospheric CO₂ drawdown is the photosynthetic carbon fi...
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:9933 2023-07-02T03:33:53+02:00 Plant organic matter mobilization and export in fluvial systems Mobilisierung und Export pflanzlicher Biomasse in Flusssystemen Hoffmann, Bernd 2016 application/pdf https://publishup.uni-potsdam.de/frontdoor/index/index/docId/9933 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-99336 https://publishup.uni-potsdam.de/files/9933/hoffmann_diss.pdf eng eng https://publishup.uni-potsdam.de/frontdoor/index/index/docId/9933 urn:nbn:de:kobv:517-opus4-99336 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-99336 https://publishup.uni-potsdam.de/files/9933/hoffmann_diss.pdf https://rightsstatements.org/vocab/InC/1.0/ info:eu-repo/semantics/openAccess ddc:550 Institut für Geowissenschaften doctoralthesis doc-type:doctoralThesis 2016 ftubpotsdam 2023-06-11T22:36:06Z The global carbon cycle is closely linked to Earth’s climate. In the context of continuously unchecked anthropogenic CO₂ emissions, the importance of natural CO₂ bond and carbon storage is increasing. An important biogenic mechanism of natural atmospheric CO₂ drawdown is the photosynthetic carbon fixation in plants and the subsequent longterm deposition of plant detritus in sediments. The main objective of this thesis is to identify factors that control mobilization and transport of plant organic matter (pOM) through rivers towards sedimentation basins. I investigated this aspect in the eastern Nepalese Arun Valley. The trans-Himalayan Arun River is characterized by a strong elevation gradient (205 − 8848 m asl) that is accompanied by strong changes in ecology and climate ranging from wet tropical conditions in the Himalayan forelad to high alpine tundra on the Tibetan Plateau. Therefore, the Arun is an excellent natural laboratory, allowing the investigation of the effect of vegetation cover, climate, and topography on plant organic matter mobilization and export in tributaries along the gradient. Based on hydrogen isotope measurements of plant waxes sampled along the Arun River and its tributaries, I first developed a model that allows for an indirect quantification of pOM contributed to the mainsetm by the Arun’s tributaries. In order to determine the role of climatic and topographic parameters of sampled tributary catchments, I looked for significant statistical relations between the amount of tributary pOM export and tributary characteristics (e.g. catchment size, plant cover, annual precipitation or runoff, topographic measures). On one hand, I demonstrated that pOMsourced from the Arun is not uniformly derived from its entire catchment area. On the other, I showed that dense vegetation is a necessary, but not sufficient, criterion for high tributary pOM export. Instead, I identified erosion and rainfall and runoff as key factors controlling pOM sourcing in the Arun Valley. This finding is supported by ... Doctoral or Postdoctoral Thesis Tundra University of Potsdam: publish.UP |
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University of Potsdam: publish.UP |
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English |
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ddc:550 Institut für Geowissenschaften |
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ddc:550 Institut für Geowissenschaften Hoffmann, Bernd Plant organic matter mobilization and export in fluvial systems |
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ddc:550 Institut für Geowissenschaften |
description |
The global carbon cycle is closely linked to Earth’s climate. In the context of continuously unchecked anthropogenic CO₂ emissions, the importance of natural CO₂ bond and carbon storage is increasing. An important biogenic mechanism of natural atmospheric CO₂ drawdown is the photosynthetic carbon fixation in plants and the subsequent longterm deposition of plant detritus in sediments. The main objective of this thesis is to identify factors that control mobilization and transport of plant organic matter (pOM) through rivers towards sedimentation basins. I investigated this aspect in the eastern Nepalese Arun Valley. The trans-Himalayan Arun River is characterized by a strong elevation gradient (205 − 8848 m asl) that is accompanied by strong changes in ecology and climate ranging from wet tropical conditions in the Himalayan forelad to high alpine tundra on the Tibetan Plateau. Therefore, the Arun is an excellent natural laboratory, allowing the investigation of the effect of vegetation cover, climate, and topography on plant organic matter mobilization and export in tributaries along the gradient. Based on hydrogen isotope measurements of plant waxes sampled along the Arun River and its tributaries, I first developed a model that allows for an indirect quantification of pOM contributed to the mainsetm by the Arun’s tributaries. In order to determine the role of climatic and topographic parameters of sampled tributary catchments, I looked for significant statistical relations between the amount of tributary pOM export and tributary characteristics (e.g. catchment size, plant cover, annual precipitation or runoff, topographic measures). On one hand, I demonstrated that pOMsourced from the Arun is not uniformly derived from its entire catchment area. On the other, I showed that dense vegetation is a necessary, but not sufficient, criterion for high tributary pOM export. Instead, I identified erosion and rainfall and runoff as key factors controlling pOM sourcing in the Arun Valley. This finding is supported by ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Hoffmann, Bernd |
author_facet |
Hoffmann, Bernd |
author_sort |
Hoffmann, Bernd |
title |
Plant organic matter mobilization and export in fluvial systems |
title_short |
Plant organic matter mobilization and export in fluvial systems |
title_full |
Plant organic matter mobilization and export in fluvial systems |
title_fullStr |
Plant organic matter mobilization and export in fluvial systems |
title_full_unstemmed |
Plant organic matter mobilization and export in fluvial systems |
title_sort |
plant organic matter mobilization and export in fluvial systems |
publishDate |
2016 |
url |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/9933 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-99336 https://publishup.uni-potsdam.de/files/9933/hoffmann_diss.pdf |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/9933 urn:nbn:de:kobv:517-opus4-99336 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-99336 https://publishup.uni-potsdam.de/files/9933/hoffmann_diss.pdf |
op_rights |
https://rightsstatements.org/vocab/InC/1.0/ info:eu-repo/semantics/openAccess |
_version_ |
1770274035660226560 |