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{{Multiple issues|{{more citations needed|date=March 2024}}
{{cleanup|date=March 2024|reason=long unreferenced bibliography section}}}}{{Short description|Danish plant ecologist and plant physiologist}}
{{Infobox scientist
|name = Carsten Olsen
|image = Olsen-Carsten.jpg
|birth_date = {{birth date|1891|03|01|df=y}}
|birth_place = [[Copenhagen]], [[Denmark]]
|nationality = [[Denmark|Danish]]
|death_date = {{death date and age|1974|08|19|1891|03|01|df=y}}
|death_place = [[Copenhagen]]
|field = Plant [[ecology]], [[Plant physiology]]
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}}
 
'''Carsten Erik Olsen''' (1 March 1, 1891 – 19 August 19, 1974) was a Danish plant ecologist and plant physiologist, who pioneered the study of [[plant nutrition]] in soils of different [[pH]]. He was born in [[Copenhagen]] and began studies of [[botany]] at the [[University of Copenhagen]] in 1910, at first with professor [[Eugenius Warming]], then with professor [[Christen Raunkiær]]. His doctoral dissertation (1921) was on the influence of soil pH on the natural distribution of plants. He was then employed by the [[Carlsberg Laboratory]] as an assistant to the chemist [[S. P. L. Sørensen]], later in his own lab. There, he worked on plant uptake of ions, especially [[iron]], [[nitrogen fixation]] and [[calcicolous plants]].
 
==Biography==
[[Image:Olsen1921.jpg|thumb|135px|right|Olsen's soil pH series with four plant species: [[Deschampsia flexuosa]], [[Senecio sylvaticus]], [[Sanguisorba minor]], [[Tussilago farfara]]]]▼
 
He was born in [[Copenhagen]] and began studies of [[botany]] at the [[University of Copenhagen]] in 1910, at first with professor [[Eugenius Warming]], then with professor [[Christen Raunkiær]]. His doctoral dissertation (1921) was on the influence of soil pH on the natural distribution of plants. He was then employed by the [[Carlsberg Laboratory]] as an assistant to the chemist [[S. P. L. Sørensen]], later in his own lab. There, he worked on plant uptake of ions, especially [[iron]], [[nitrogen fixation]] and [[Calcicole|calcicolous plants]].
Scientific works by Carsten Olsen:▼
<ref>{{cite web|url= https://runeberg.org/salmonsen/2/18/0507.html|title = Olsen, Carsten Erik |website=Salmonsens konversationsleksikon
|access-date=May 1, 2020}}</ref>
 
▲[[Image:Olsen1921.jpg|thumb|135px|right|Olsen's soil pH series with four plant species: [[Deschampsia flexuosa]], [[Senecio sylvaticus]], [[Sanguisorba minor]], [[Tussilago farfara]]]]
 
▲==Scientific works by Carsten Olsen:==
* Olsen, C. (1914) Vegetationen i nordsjællandske Sphagnummoser. [[Botanisk Tidsskrift]] 34, 1-44.
* Olsen, C. (1914) The structure and biology of Arctic flowering plants. 9. Cornaceae. [[Meddelelser om Grønland]] 37, 127-150.
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* Olsen, C. (1970) On biological nitrogen fixation in nature, particularly in blue-green algae. Comptes Rendus des Travaux du Laboratoire Carlsberg. Série Chimique, 37 (12), 269-283.
 
==References==
Works on Carsten Olsen:
{{reflist}}
 
==Other sources==
* Obituary in [[Botanisk Tidsskrift]] 70 (1): 98-100 (1973) by E. Bille Hansen.
 
==External links==
*[https://www.researchgate.net/scientific-contributions/2163579219_Carl_Erik_Olsen Carl Erik Olsen research while affiliated with University of Copenhagen]
{{authority control}}
 
{{DEFAULTSORT:Olsen, Carsten}}
[[Category:1891 births]]
[[Category:1974 deaths]]
[[Category:20th-century Danish scientistsbotanists]]
[[Category:Danish biologists]]
[[Category:Danish botanists]]
[[Category:Danish ecologists]]
[[Category:University of Copenhagen alumni]]
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