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Permafrost nitrogen status and its determinants on the Tibetan Plateau

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Item embargoed until 2021-06-07. Restrictions imposed by the publisher
Self archived version
final draft
Date
2020
Author(s)
Mao, Chao
Kou, Dan
Chen, Leiyi
Qin, Shuqi
Zhang, Dianye
Peng, Yunfeng
Yang, Yuanhe
Unique identifier
10.1111/gcb.15205
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Citation
Mao, Chao. Kou, Dan. Chen, Leiyi. Qin, Shuqi. Zhang, Dianye. Peng, Yunfeng. Yang, Yuanhe. (2020). Permafrost nitrogen status and its determinants on the Tibetan Plateau.  Global change biology, 26 (9) , 5290-5302. 10.1111/gcb.15205.
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© 2020 John Wiley & Sons Ltd
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Abstract

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.

Subjects
climate warming   frozen nitrogen   nitrogen availability   nitrogen cycle   nitrogen transformation rates   permafrost thaw   
URI
https://erepo.uef.fi/handle/123456789/8386
Link to the original item
http://dx.doi.org/10.1111/gcb.15205
Publisher
Wiley
Collections
  • Luonnontieteiden ja metsätieteiden tiedekunta [1077]

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