Permafrost nitrogen status and its determinants on the Tibetan Plateau
It had been suggested that permafrost thaw could promote frozen nitrogen (N) release and modify microbial N transformation rates, which might alter soil N availability and then regulate ecosystem functions. However, the current understanding of this issue is confined to limited observations in the A...
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ftuniveasternfin:oai:erepo.uef.fi:123456789/8386 2023-05-15T15:13:28+02:00 Permafrost nitrogen status and its determinants on the Tibetan Plateau Mao, Chao Kou, Dan Chen, Leiyi Qin, Shuqi Zhang, Dianye Peng, Yunfeng Yang, Yuanhe Ympäristö- ja biotieteiden laitos / Toiminta 2020-10-21T11:24:21Z 5290-5302 https://erepo.uef.fi/handle/123456789/8386 englanti unknown Wiley Global change biology http://dx.doi.org/10.1111/gcb.15205 10.1111/gcb.15205 1354-1013 9 26 https://erepo.uef.fi/handle/123456789/8386 In copyright 1.0 openAccess © 2020 John Wiley & Sons Ltd https://rightsstatements.org/page/InC/1.0/ climate warming frozen nitrogen nitrogen availability nitrogen cycle nitrogen transformation rates permafrost thaw Tieteelliset aikakauslehtiartikkelit A1 article artikkeli 2020 ftuniveasternfin https://doi.org/10.1111/gcb.15205 2022-12-11T06:50:43Z It had been suggested that permafrost thaw could promote frozen nitrogen (N) release and modify microbial N transformation rates, which might alter soil N availability and then regulate ecosystem functions. However, the current understanding of this issue is confined to limited observations in the Arctic permafrost region, without any systematic measurements in other permafrost regions. Based on a large‐scale field investigation along a 1,000 km transect and a laboratory incubation experiment with a 15N pool dilution approach, this study provides the comprehensive evaluation of the permafrost N status, including the available N content and related N transformation rates, across the Tibetan alpine permafrost region. In contrast to the prevailing view, our results showed that the Tibetan alpine permafrost had lower available N content and net N mineralization rate than the active layer. Moreover, the permafrost had lower gross rates of N mineralization, microbial immobilization and nitrification than the active layer. Our results also revealed that the dominant drivers of the gross N mineralization and microbial immobilization rates differed between the permafrost and the active layer, with these rates being determined by microbial properties in the permafrost while regulated by soil moisture in the active layer. In contrast, soil gross nitrification rate was consistently modulated by the soil urn:x-wiley:13541013:media:gcb15205:gcb15205-math-0001 content in both the permafrost and the active layer. Overall, patterns and drivers of permafrost N pools and transformation rates observed in this study offer new insights into the potential N release upon permafrost thaw and provide important clues for Earth system models to better predict permafrost biogeochemical cycles under a warming climate. final draft peerReviewed Article in Journal/Newspaper Arctic permafrost UEF eRepository (University of Eastern Finland) Arctic Global Change Biology 26 9 5290 5302 |
institution |
Open Polar |
collection |
UEF eRepository (University of Eastern Finland) |
op_collection_id |
ftuniveasternfin |
language |
unknown |
topic |
climate warming frozen nitrogen nitrogen availability nitrogen cycle nitrogen transformation rates permafrost thaw |
spellingShingle |
climate warming frozen nitrogen nitrogen availability nitrogen cycle nitrogen transformation rates permafrost thaw Mao, Chao Kou, Dan Chen, Leiyi Qin, Shuqi Zhang, Dianye Peng, Yunfeng Yang, Yuanhe Permafrost nitrogen status and its determinants on the Tibetan Plateau |
topic_facet |
climate warming frozen nitrogen nitrogen availability nitrogen cycle nitrogen transformation rates permafrost thaw |
description |
It had been suggested that permafrost thaw could promote frozen nitrogen (N) release and modify microbial N transformation rates, which might alter soil N availability and then regulate ecosystem functions. However, the current understanding of this issue is confined to limited observations in the Arctic permafrost region, without any systematic measurements in other permafrost regions. Based on a large‐scale field investigation along a 1,000 km transect and a laboratory incubation experiment with a 15N pool dilution approach, this study provides the comprehensive evaluation of the permafrost N status, including the available N content and related N transformation rates, across the Tibetan alpine permafrost region. In contrast to the prevailing view, our results showed that the Tibetan alpine permafrost had lower available N content and net N mineralization rate than the active layer. Moreover, the permafrost had lower gross rates of N mineralization, microbial immobilization and nitrification than the active layer. Our results also revealed that the dominant drivers of the gross N mineralization and microbial immobilization rates differed between the permafrost and the active layer, with these rates being determined by microbial properties in the permafrost while regulated by soil moisture in the active layer. In contrast, soil gross nitrification rate was consistently modulated by the soil urn:x-wiley:13541013:media:gcb15205:gcb15205-math-0001 content in both the permafrost and the active layer. Overall, patterns and drivers of permafrost N pools and transformation rates observed in this study offer new insights into the potential N release upon permafrost thaw and provide important clues for Earth system models to better predict permafrost biogeochemical cycles under a warming climate. final draft peerReviewed |
author2 |
Ympäristö- ja biotieteiden laitos / Toiminta |
format |
Article in Journal/Newspaper |
author |
Mao, Chao Kou, Dan Chen, Leiyi Qin, Shuqi Zhang, Dianye Peng, Yunfeng Yang, Yuanhe |
author_facet |
Mao, Chao Kou, Dan Chen, Leiyi Qin, Shuqi Zhang, Dianye Peng, Yunfeng Yang, Yuanhe |
author_sort |
Mao, Chao |
title |
Permafrost nitrogen status and its determinants on the Tibetan Plateau |
title_short |
Permafrost nitrogen status and its determinants on the Tibetan Plateau |
title_full |
Permafrost nitrogen status and its determinants on the Tibetan Plateau |
title_fullStr |
Permafrost nitrogen status and its determinants on the Tibetan Plateau |
title_full_unstemmed |
Permafrost nitrogen status and its determinants on the Tibetan Plateau |
title_sort |
permafrost nitrogen status and its determinants on the tibetan plateau |
publisher |
Wiley |
publishDate |
2020 |
url |
https://erepo.uef.fi/handle/123456789/8386 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_relation |
Global change biology http://dx.doi.org/10.1111/gcb.15205 10.1111/gcb.15205 1354-1013 9 26 https://erepo.uef.fi/handle/123456789/8386 |
op_rights |
In copyright 1.0 openAccess © 2020 John Wiley & Sons Ltd https://rightsstatements.org/page/InC/1.0/ |
op_doi |
https://doi.org/10.1111/gcb.15205 |
container_title |
Global Change Biology |
container_volume |
26 |
container_issue |
9 |
container_start_page |
5290 |
op_container_end_page |
5302 |
_version_ |
1766344021005828096 |