Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic
Climate change is exposing high-latitude systems to warming and a shift towards more shrub-dominated plant communities, resulting in increased leaf-litter inputs at the soil surface, and more labile root-derived organic matter (OM) input in the soil profile. Labile OM can stimulate the mineralizatio...
Published in: | Ecology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Ecological Society of America
2020
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Online Access: | https://lup.lub.lu.se/record/42908c64-1464-4115-b36e-b72764e92376 https://doi.org/10.1002/ecy.3094 |
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ftulundlup:oai:lup.lub.lu.se:42908c64-1464-4115-b36e-b72764e92376 2024-04-21T08:12:25+00:00 Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic Hicks, Lettice C. Leizeaga, Ainara Rousk, Kathrin Michelsen, Anders Rousk, Johannes 2020-09 https://lup.lub.lu.se/record/42908c64-1464-4115-b36e-b72764e92376 https://doi.org/10.1002/ecy.3094 eng eng Ecological Society of America https://lup.lub.lu.se/record/42908c64-1464-4115-b36e-b72764e92376 http://dx.doi.org/10.1002/ecy.3094 scopus:85086109570 pmid:32379897 Ecology; 101(9), no e03094 (2020) ISSN: 0012-9658 Soil Science Environmental Sciences related to Agriculture and Land-use carbon and nitrogen mineralization climate change microbial carbon use efficiency nitrogen limitation nitrogen-mining rhizosphere biogeochemistry soil priming effect subarctic tundra contributiontojournal/article info:eu-repo/semantics/article text 2020 ftulundlup https://doi.org/10.1002/ecy.3094 2024-03-27T15:04:42Z Climate change is exposing high-latitude systems to warming and a shift towards more shrub-dominated plant communities, resulting in increased leaf-litter inputs at the soil surface, and more labile root-derived organic matter (OM) input in the soil profile. Labile OM can stimulate the mineralization of soil organic matter (SOM); a phenomenon termed “priming.” In N-poor subarctic soils, it is hypothesized that microorganisms may “prime” SOM in order to acquire N (microbial N-mining). Increased leaf-litter inputs with a high C/N ratio might further exacerbate microbial N demand, and increase the susceptibility of N-poor soils to N-mining. We investigated the N-control of SOM mineralization by amending soils from climate change–simulation treatments in the subarctic (+1.1°C warming, birch litter addition, willow litter addition, and fungal sporocarp addition) with labile OM either in the form of glucose (labile C; equivalent to 400 µg C/g fresh [fwt] soil) or alanine (labile C + N; equivalent to 400 µg C and 157 µg N/g fwt soil), to simulate rhizosphere inputs. Surprisingly, we found that despite 5 yr of simulated climate change treatments, there were no significant effects of the field-treatments on microbial process rates, community structure or responses to labile OM. Glucose primed the mineralization of both C and N from SOM, but gross mineralization of N was stimulated more than that of C, suggesting that microbial SOM use increased in magnitude and shifted to components richer in N (i.e., selective microbial N-mining). The addition of alanine also resulted in priming of both C and N mineralization, but the N mineralization stimulated by alanine was greater than that stimulated by glucose, indicating strong N-mining even when a source of labile OM including N was supplied. Microbial carbon use efficiency was reduced in response to both labile OM inputs. Overall, these findings suggest that shrub expansion could fundamentally alter biogeochemical cycling in the subarctic, yielding more N available for plant ... Article in Journal/Newspaper Subarctic Tundra Lund University Publications (LUP) Ecology 101 9 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Soil Science Environmental Sciences related to Agriculture and Land-use carbon and nitrogen mineralization climate change microbial carbon use efficiency nitrogen limitation nitrogen-mining rhizosphere biogeochemistry soil priming effect subarctic tundra |
spellingShingle |
Soil Science Environmental Sciences related to Agriculture and Land-use carbon and nitrogen mineralization climate change microbial carbon use efficiency nitrogen limitation nitrogen-mining rhizosphere biogeochemistry soil priming effect subarctic tundra Hicks, Lettice C. Leizeaga, Ainara Rousk, Kathrin Michelsen, Anders Rousk, Johannes Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic |
topic_facet |
Soil Science Environmental Sciences related to Agriculture and Land-use carbon and nitrogen mineralization climate change microbial carbon use efficiency nitrogen limitation nitrogen-mining rhizosphere biogeochemistry soil priming effect subarctic tundra |
description |
Climate change is exposing high-latitude systems to warming and a shift towards more shrub-dominated plant communities, resulting in increased leaf-litter inputs at the soil surface, and more labile root-derived organic matter (OM) input in the soil profile. Labile OM can stimulate the mineralization of soil organic matter (SOM); a phenomenon termed “priming.” In N-poor subarctic soils, it is hypothesized that microorganisms may “prime” SOM in order to acquire N (microbial N-mining). Increased leaf-litter inputs with a high C/N ratio might further exacerbate microbial N demand, and increase the susceptibility of N-poor soils to N-mining. We investigated the N-control of SOM mineralization by amending soils from climate change–simulation treatments in the subarctic (+1.1°C warming, birch litter addition, willow litter addition, and fungal sporocarp addition) with labile OM either in the form of glucose (labile C; equivalent to 400 µg C/g fresh [fwt] soil) or alanine (labile C + N; equivalent to 400 µg C and 157 µg N/g fwt soil), to simulate rhizosphere inputs. Surprisingly, we found that despite 5 yr of simulated climate change treatments, there were no significant effects of the field-treatments on microbial process rates, community structure or responses to labile OM. Glucose primed the mineralization of both C and N from SOM, but gross mineralization of N was stimulated more than that of C, suggesting that microbial SOM use increased in magnitude and shifted to components richer in N (i.e., selective microbial N-mining). The addition of alanine also resulted in priming of both C and N mineralization, but the N mineralization stimulated by alanine was greater than that stimulated by glucose, indicating strong N-mining even when a source of labile OM including N was supplied. Microbial carbon use efficiency was reduced in response to both labile OM inputs. Overall, these findings suggest that shrub expansion could fundamentally alter biogeochemical cycling in the subarctic, yielding more N available for plant ... |
format |
Article in Journal/Newspaper |
author |
Hicks, Lettice C. Leizeaga, Ainara Rousk, Kathrin Michelsen, Anders Rousk, Johannes |
author_facet |
Hicks, Lettice C. Leizeaga, Ainara Rousk, Kathrin Michelsen, Anders Rousk, Johannes |
author_sort |
Hicks, Lettice C. |
title |
Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic |
title_short |
Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic |
title_full |
Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic |
title_fullStr |
Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic |
title_full_unstemmed |
Simulated rhizosphere deposits induce microbial N-mining that may accelerate shrubification in the subarctic |
title_sort |
simulated rhizosphere deposits induce microbial n-mining that may accelerate shrubification in the subarctic |
publisher |
Ecological Society of America |
publishDate |
2020 |
url |
https://lup.lub.lu.se/record/42908c64-1464-4115-b36e-b72764e92376 https://doi.org/10.1002/ecy.3094 |
genre |
Subarctic Tundra |
genre_facet |
Subarctic Tundra |
op_source |
Ecology; 101(9), no e03094 (2020) ISSN: 0012-9658 |
op_relation |
https://lup.lub.lu.se/record/42908c64-1464-4115-b36e-b72764e92376 http://dx.doi.org/10.1002/ecy.3094 scopus:85086109570 pmid:32379897 |
op_doi |
https://doi.org/10.1002/ecy.3094 |
container_title |
Ecology |
container_volume |
101 |
container_issue |
9 |
_version_ |
1796932458063593472 |