A review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils—changing the paradigm
The paradigm that permafrost-affected soils show restricted mineral nitrogen (N) cycling in favor of organic N compounds is based on the observation that net N mineralization rates in these cold climates are negligible. However, we find here that this perception is wrong. By synthesizing published d...
Published in: | Environmental Research Letters |
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2022
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Online Access: | https://doi.org/10.1088/1748-9326/ac417e https://doaj.org/article/260f0ab89038450986f38e3b0b96e970 |
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ftdoajarticles:oai:doaj.org/article:260f0ab89038450986f38e3b0b96e970 2023-09-05T13:17:50+02:00 A review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils—changing the paradigm Elisabeth Ramm Chunyan Liu Per Ambus Klaus Butterbach-Bahl Bin Hu Pertti J Martikainen Maija E Marushchak Carsten W Mueller Heinz Rennenberg Michael Schloter Henri M P Siljanen Carolina Voigt Christian Werner Christina Biasi Michael Dannenmann 2022-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/ac417e https://doaj.org/article/260f0ab89038450986f38e3b0b96e970 EN eng IOP Publishing https://doi.org/10.1088/1748-9326/ac417e https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/ac417e 1748-9326 https://doaj.org/article/260f0ab89038450986f38e3b0b96e970 Environmental Research Letters, Vol 17, Iss 1, p 013004 (2022) permafrost nitrogen gross N turnover mineralization meta-analysis plant-soil-microbe system Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2022 ftdoajarticles https://doi.org/10.1088/1748-9326/ac417e 2023-08-13T00:36:45Z The paradigm that permafrost-affected soils show restricted mineral nitrogen (N) cycling in favor of organic N compounds is based on the observation that net N mineralization rates in these cold climates are negligible. However, we find here that this perception is wrong. By synthesizing published data on N cycling in the plant-soil-microbe system of permafrost ecosystems we show that gross ammonification and nitrification rates in active layers were of similar magnitude and showed a similar dependence on soil organic carbon (C) and total N concentrations as observed in temperate and tropical systems. Moreover, high protein depolymerization rates and only marginal effects of C:N stoichiometry on gross N turnover provided little evidence for N limitation. Instead, the rather short period when soils are not frozen is the single main factor limiting N turnover. High gross rates of mineral N cycling are thus facilitated by released protection of organic matter in active layers with nitrification gaining particular importance in N-rich soils, such as organic soils without vegetation. Our finding that permafrost-affected soils show vigorous N cycling activity is confirmed by the rich functional microbial community which can be found both in active and permafrost layers. The high rates of N cycling and soil N availability are supported by biological N fixation, while atmospheric N deposition in the Arctic still is marginal except for fire-affected areas. In line with high soil mineral N production, recent plant physiological research indicates a higher importance of mineral plant N nutrition than previously thought. Our synthesis shows that mineral N production and turnover rates in active layers of permafrost-affected soils do not generally differ from those observed in temperate or tropical soils. We therefore suggest to adjust the permafrost N cycle paradigm, assigning a generally important role to mineral N cycling. This new paradigm suggests larger permafrost N climate feedbacks than assumed previously. Article in Journal/Newspaper Arctic permafrost Directory of Open Access Journals: DOAJ Articles Arctic Environmental Research Letters 17 1 013004 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
permafrost nitrogen gross N turnover mineralization meta-analysis plant-soil-microbe system Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
permafrost nitrogen gross N turnover mineralization meta-analysis plant-soil-microbe system Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Elisabeth Ramm Chunyan Liu Per Ambus Klaus Butterbach-Bahl Bin Hu Pertti J Martikainen Maija E Marushchak Carsten W Mueller Heinz Rennenberg Michael Schloter Henri M P Siljanen Carolina Voigt Christian Werner Christina Biasi Michael Dannenmann A review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils—changing the paradigm |
topic_facet |
permafrost nitrogen gross N turnover mineralization meta-analysis plant-soil-microbe system Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
The paradigm that permafrost-affected soils show restricted mineral nitrogen (N) cycling in favor of organic N compounds is based on the observation that net N mineralization rates in these cold climates are negligible. However, we find here that this perception is wrong. By synthesizing published data on N cycling in the plant-soil-microbe system of permafrost ecosystems we show that gross ammonification and nitrification rates in active layers were of similar magnitude and showed a similar dependence on soil organic carbon (C) and total N concentrations as observed in temperate and tropical systems. Moreover, high protein depolymerization rates and only marginal effects of C:N stoichiometry on gross N turnover provided little evidence for N limitation. Instead, the rather short period when soils are not frozen is the single main factor limiting N turnover. High gross rates of mineral N cycling are thus facilitated by released protection of organic matter in active layers with nitrification gaining particular importance in N-rich soils, such as organic soils without vegetation. Our finding that permafrost-affected soils show vigorous N cycling activity is confirmed by the rich functional microbial community which can be found both in active and permafrost layers. The high rates of N cycling and soil N availability are supported by biological N fixation, while atmospheric N deposition in the Arctic still is marginal except for fire-affected areas. In line with high soil mineral N production, recent plant physiological research indicates a higher importance of mineral plant N nutrition than previously thought. Our synthesis shows that mineral N production and turnover rates in active layers of permafrost-affected soils do not generally differ from those observed in temperate or tropical soils. We therefore suggest to adjust the permafrost N cycle paradigm, assigning a generally important role to mineral N cycling. This new paradigm suggests larger permafrost N climate feedbacks than assumed previously. |
format |
Article in Journal/Newspaper |
author |
Elisabeth Ramm Chunyan Liu Per Ambus Klaus Butterbach-Bahl Bin Hu Pertti J Martikainen Maija E Marushchak Carsten W Mueller Heinz Rennenberg Michael Schloter Henri M P Siljanen Carolina Voigt Christian Werner Christina Biasi Michael Dannenmann |
author_facet |
Elisabeth Ramm Chunyan Liu Per Ambus Klaus Butterbach-Bahl Bin Hu Pertti J Martikainen Maija E Marushchak Carsten W Mueller Heinz Rennenberg Michael Schloter Henri M P Siljanen Carolina Voigt Christian Werner Christina Biasi Michael Dannenmann |
author_sort |
Elisabeth Ramm |
title |
A review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils—changing the paradigm |
title_short |
A review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils—changing the paradigm |
title_full |
A review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils—changing the paradigm |
title_fullStr |
A review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils—changing the paradigm |
title_full_unstemmed |
A review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils—changing the paradigm |
title_sort |
review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils—changing the paradigm |
publisher |
IOP Publishing |
publishDate |
2022 |
url |
https://doi.org/10.1088/1748-9326/ac417e https://doaj.org/article/260f0ab89038450986f38e3b0b96e970 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_source |
Environmental Research Letters, Vol 17, Iss 1, p 013004 (2022) |
op_relation |
https://doi.org/10.1088/1748-9326/ac417e https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/ac417e 1748-9326 https://doaj.org/article/260f0ab89038450986f38e3b0b96e970 |
op_doi |
https://doi.org/10.1088/1748-9326/ac417e |
container_title |
Environmental Research Letters |
container_volume |
17 |
container_issue |
1 |
container_start_page |
013004 |
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1776198851751837696 |