The spatial distribution of sedimentary compounds and their environmental implications in surface sediments of Lake Khar Nuur (Mongolian Altai)
Lake sediments are valuable natural archives to reconstruct paleoclimate and paleoenvironmental changes which consist of inorganic and organic sediment compounds of allochthonous origin from the catchment and of autochthonous production in the lake. However, for robust paleo-reconstructions it is im...
Published in: | Earth Surface Processes and Landforms |
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Wiley
2021
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Online Access: | https://doi.org/10.1002/esp.5049 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20210318-141339-003 https://www.db-thueringen.de/receive/dbt_mods_00048026 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00052809/ESP_ESP5049.pdf |
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ftdbthueringen:oai:www.db-thueringen.de:dbt_mods_00048026 2024-04-07T07:51:31+00:00 The spatial distribution of sedimentary compounds and their environmental implications in surface sediments of Lake Khar Nuur (Mongolian Altai) Strobel, P. Struck, J. Zech, R. Bliedtner, M. 2021-01-26 16 Seiten https://doi.org/10.1002/esp.5049 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20210318-141339-003 https://www.db-thueringen.de/receive/dbt_mods_00048026 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00052809/ESP_ESP5049.pdf eng eng Wiley Earth surface processes and landforms -- Earth Surf. Process. Landforms -- 0197-9337 -- 1096-9837 https://doi.org/10.1002/esp.5049 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20210318-141339-003 https://www.db-thueringen.de/receive/dbt_mods_00048026 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00052809/ESP_ESP5049.pdf Open Access related to alliance or national license public info:eu-repo/semantics/openAccess article ScholarlyArticle ddc:910 geochemistry grain size lake sediments n ‐alkanes sediment focussing stable isotopes article Text doc-type:Article 2021 ftdbthueringen https://doi.org/10.1002/esp.5049 2024-03-08T13:28:55Z Lake sediments are valuable natural archives to reconstruct paleoclimate and paleoenvironmental changes which consist of inorganic and organic sediment compounds of allochthonous origin from the catchment and of autochthonous production in the lake. However, for robust paleo-reconstructions it is important to develop a better understanding about sedimentation processes, the origin of inorganic and organic sediment compounds and their distribution within the lake. In this context, modern process studies provide important insights, although environmental and anthropological changes can affect the spatial distribution of sediment compounds through time. Therefore, in this study the spatial distribution of grain size and geochemical proxies in 52 surface sediment samples from Lake Khar Nuur, a small high-altitude lake in the Mongolian Altai with a small and anthropogenically used hydrological catchment, is investigated. The results show a distinct sediment focussing in the two deep basins of the lake, which therefore act as accumulation zones. In those accumulation zones, total organic carbon (TOC), total nitrogen (N) and their isotopic composition (δ13CTOC, δ15N) as well as n-alkanes indicate that organic sediment compounds are a mixture of both allochthonous and autochthonous origin. While the recent catchment vegetation consists of grasses/herbs and the shrub Betula nana (L.) with distinct differences in their n-alkane homologue patterns, those differences are not reflected in the sediment surface samples which rather indicates that grass-derived n-alkanes become preferentially incorporated in the lake. Extensive anthropogenic activity such as grazing and housing in the southern part of the catchment causes soil erosion which is well reflected by high TOC, N and sulphur (S) contents and 15N depleted δ15N values at the central southern shore, i.e. increased allochthonous sediment input by anthropogenicallyinduced soil erosion. Overall, the surface sediments of Lake Khar Nuur origin from allochthonous and ... Article in Journal/Newspaper Betula nana Digital Library Thüringen Earth Surface Processes and Landforms 46 3 611 625 |
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Open Polar |
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Digital Library Thüringen |
op_collection_id |
ftdbthueringen |
language |
English |
topic |
article ScholarlyArticle ddc:910 geochemistry grain size lake sediments n ‐alkanes sediment focussing stable isotopes |
spellingShingle |
article ScholarlyArticle ddc:910 geochemistry grain size lake sediments n ‐alkanes sediment focussing stable isotopes Strobel, P. Struck, J. Zech, R. Bliedtner, M. The spatial distribution of sedimentary compounds and their environmental implications in surface sediments of Lake Khar Nuur (Mongolian Altai) |
topic_facet |
article ScholarlyArticle ddc:910 geochemistry grain size lake sediments n ‐alkanes sediment focussing stable isotopes |
description |
Lake sediments are valuable natural archives to reconstruct paleoclimate and paleoenvironmental changes which consist of inorganic and organic sediment compounds of allochthonous origin from the catchment and of autochthonous production in the lake. However, for robust paleo-reconstructions it is important to develop a better understanding about sedimentation processes, the origin of inorganic and organic sediment compounds and their distribution within the lake. In this context, modern process studies provide important insights, although environmental and anthropological changes can affect the spatial distribution of sediment compounds through time. Therefore, in this study the spatial distribution of grain size and geochemical proxies in 52 surface sediment samples from Lake Khar Nuur, a small high-altitude lake in the Mongolian Altai with a small and anthropogenically used hydrological catchment, is investigated. The results show a distinct sediment focussing in the two deep basins of the lake, which therefore act as accumulation zones. In those accumulation zones, total organic carbon (TOC), total nitrogen (N) and their isotopic composition (δ13CTOC, δ15N) as well as n-alkanes indicate that organic sediment compounds are a mixture of both allochthonous and autochthonous origin. While the recent catchment vegetation consists of grasses/herbs and the shrub Betula nana (L.) with distinct differences in their n-alkane homologue patterns, those differences are not reflected in the sediment surface samples which rather indicates that grass-derived n-alkanes become preferentially incorporated in the lake. Extensive anthropogenic activity such as grazing and housing in the southern part of the catchment causes soil erosion which is well reflected by high TOC, N and sulphur (S) contents and 15N depleted δ15N values at the central southern shore, i.e. increased allochthonous sediment input by anthropogenicallyinduced soil erosion. Overall, the surface sediments of Lake Khar Nuur origin from allochthonous and ... |
format |
Article in Journal/Newspaper |
author |
Strobel, P. Struck, J. Zech, R. Bliedtner, M. |
author_facet |
Strobel, P. Struck, J. Zech, R. Bliedtner, M. |
author_sort |
Strobel, P. |
title |
The spatial distribution of sedimentary compounds and their environmental implications in surface sediments of Lake Khar Nuur (Mongolian Altai) |
title_short |
The spatial distribution of sedimentary compounds and their environmental implications in surface sediments of Lake Khar Nuur (Mongolian Altai) |
title_full |
The spatial distribution of sedimentary compounds and their environmental implications in surface sediments of Lake Khar Nuur (Mongolian Altai) |
title_fullStr |
The spatial distribution of sedimentary compounds and their environmental implications in surface sediments of Lake Khar Nuur (Mongolian Altai) |
title_full_unstemmed |
The spatial distribution of sedimentary compounds and their environmental implications in surface sediments of Lake Khar Nuur (Mongolian Altai) |
title_sort |
spatial distribution of sedimentary compounds and their environmental implications in surface sediments of lake khar nuur (mongolian altai) |
publisher |
Wiley |
publishDate |
2021 |
url |
https://doi.org/10.1002/esp.5049 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20210318-141339-003 https://www.db-thueringen.de/receive/dbt_mods_00048026 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00052809/ESP_ESP5049.pdf |
genre |
Betula nana |
genre_facet |
Betula nana |
op_relation |
Earth surface processes and landforms -- Earth Surf. Process. Landforms -- 0197-9337 -- 1096-9837 https://doi.org/10.1002/esp.5049 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20210318-141339-003 https://www.db-thueringen.de/receive/dbt_mods_00048026 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00052809/ESP_ESP5049.pdf |
op_rights |
Open Access related to alliance or national license public info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/esp.5049 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
46 |
container_issue |
3 |
container_start_page |
611 |
op_container_end_page |
625 |
_version_ |
1795666507974311936 |