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dc.contributor.authorMao, Chao
dc.contributor.authorKou, Dan
dc.contributor.authorChen, Leiyi
dc.contributor.authorQin, Shuqi
dc.contributor.authorZhang, Dianye
dc.contributor.authorPeng, Yunfeng
dc.contributor.authorYang, Yuanhe
dc.date.accessioned2020-10-21T11:24:21Z
dc.date.available2020-10-21T11:24:21Z
dc.date.issued2020
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/8386
dc.description.abstractIt 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.
dc.language.isoenglanti
dc.publisherWiley
dc.relation.ispartofseriesGlobal change biology
dc.relation.urihttp://dx.doi.org/10.1111/gcb.15205
dc.rightsAll rights reserved
dc.subjectclimate warming
dc.subjectfrozen nitrogen
dc.subjectnitrogen availability
dc.subjectnitrogen cycle
dc.subjectnitrogen transformation rates
dc.subjectpermafrost thaw
dc.titlePermafrost nitrogen status and its determinants on the Tibetan Plateau
dc.description.versionfinal draft
dc.contributor.departmentYmpäristö- ja biotieteiden laitos / Toiminta
uef.solecris.id71397873en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© 2020 John Wiley & Sons Ltd
dc.relation.doi10.1111/gcb.15205
dc.description.reviewstatuspeerReviewed
dc.format.pagerange5290-5302
dc.relation.issn1354-1013
dc.relation.issue9
dc.relation.volume26
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessEi


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