The microbiology of cryopedogenic soils of the subarctic with particular reference to the Churchill region
Soil materials taken from sampling sites in the Churchill and Inuvik areas were examined in an attempt to determine the role of various micro-organisms contributing to cryopedogenesis. Examination of the samples taken during September 1964 and 1965 included a critical study of the physico-chemical,...
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Language: | English |
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1968
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ftunivmanitoba:oai:mspace.lib.umanitoba.ca:1993/5605 2023-06-18T03:41:28+02:00 The microbiology of cryopedogenic soils of the subarctic with particular reference to the Churchill region Dular, Ram 1968 xix, 261 leaves : application/pdf http://hdl.handle.net/1993/5605 eng eng ocm72765088 http://hdl.handle.net/1993/5605 open access doctoral thesis 1968 ftunivmanitoba 2023-06-04T17:47:31Z Soil materials taken from sampling sites in the Churchill and Inuvik areas were examined in an attempt to determine the role of various micro-organisms contributing to cryopedogenesis. Examination of the samples taken during September 1964 and 1965 included a critical study of the physico-chemical, microbiological and general biological characteristics. The findings suggest that soil development in the area is typical of that proceeding in other cryopedogenic regions in North America. These soils, further, are characterized as harbouring considerable population of bacteria, fungi and actinomycetes which, in general, tend to decrease abruptly (in a numberical sense) with depth. Soils are biologically active and are comparable to temperate soils in terms of their potential biological activity as determined by respiration intensity, mineralization of organic nitrogen and other enzymic activities. Microbial population in the areas consists mainly of cold-adapted native species similar in many respects to those forms prevalent in more temperate regions. Among the actinomycetes and fungi, the total number of genera encountered was low but, where present, these constituted a significant proportion of the total microbial population. A large number of quite different microbial isolates were found to be capable of growing under nitrogen-fixing conditions. Although they were mainly bacterial in type, some nitrogen-fixing species of fungi, yeasts and actinomycetes were noted. Counts of nitrogen-fixers ranged from several tens of thousands to several millions per gram of soil. The significance of these findings in terms of cryopedogenesis is discussed. Doctoral or Postdoctoral Thesis Inuvik Subarctic MSpace at the University of Manitoba Inuvik ENVELOPE(-133.610,-133.610,68.341,68.341) |
institution |
Open Polar |
collection |
MSpace at the University of Manitoba |
op_collection_id |
ftunivmanitoba |
language |
English |
description |
Soil materials taken from sampling sites in the Churchill and Inuvik areas were examined in an attempt to determine the role of various micro-organisms contributing to cryopedogenesis. Examination of the samples taken during September 1964 and 1965 included a critical study of the physico-chemical, microbiological and general biological characteristics. The findings suggest that soil development in the area is typical of that proceeding in other cryopedogenic regions in North America. These soils, further, are characterized as harbouring considerable population of bacteria, fungi and actinomycetes which, in general, tend to decrease abruptly (in a numberical sense) with depth. Soils are biologically active and are comparable to temperate soils in terms of their potential biological activity as determined by respiration intensity, mineralization of organic nitrogen and other enzymic activities. Microbial population in the areas consists mainly of cold-adapted native species similar in many respects to those forms prevalent in more temperate regions. Among the actinomycetes and fungi, the total number of genera encountered was low but, where present, these constituted a significant proportion of the total microbial population. A large number of quite different microbial isolates were found to be capable of growing under nitrogen-fixing conditions. Although they were mainly bacterial in type, some nitrogen-fixing species of fungi, yeasts and actinomycetes were noted. Counts of nitrogen-fixers ranged from several tens of thousands to several millions per gram of soil. The significance of these findings in terms of cryopedogenesis is discussed. |
format |
Doctoral or Postdoctoral Thesis |
author |
Dular, Ram |
spellingShingle |
Dular, Ram The microbiology of cryopedogenic soils of the subarctic with particular reference to the Churchill region |
author_facet |
Dular, Ram |
author_sort |
Dular, Ram |
title |
The microbiology of cryopedogenic soils of the subarctic with particular reference to the Churchill region |
title_short |
The microbiology of cryopedogenic soils of the subarctic with particular reference to the Churchill region |
title_full |
The microbiology of cryopedogenic soils of the subarctic with particular reference to the Churchill region |
title_fullStr |
The microbiology of cryopedogenic soils of the subarctic with particular reference to the Churchill region |
title_full_unstemmed |
The microbiology of cryopedogenic soils of the subarctic with particular reference to the Churchill region |
title_sort |
microbiology of cryopedogenic soils of the subarctic with particular reference to the churchill region |
publishDate |
1968 |
url |
http://hdl.handle.net/1993/5605 |
long_lat |
ENVELOPE(-133.610,-133.610,68.341,68.341) |
geographic |
Inuvik |
geographic_facet |
Inuvik |
genre |
Inuvik Subarctic |
genre_facet |
Inuvik Subarctic |
op_relation |
ocm72765088 http://hdl.handle.net/1993/5605 |
op_rights |
open access |
_version_ |
1769007062612705280 |