Microbial nitrogen and phosphorus co-limitation across permafrost region.
alpine permafrost
carbon-nitrogen-phosphorus interaction
ecoenzymatic stoichiometry
microbial nutrient limitation
nutrient addition experiment
Journal
Global change biology
ISSN: 1365-2486
Titre abrégé: Glob Chang Biol
Pays: England
ID NLM: 9888746
Informations de publication
Date de publication:
07 2023
07 2023
Historique:
received:
21
02
2023
accepted:
05
04
2023
medline:
15
6
2023
pubmed:
25
4
2023
entrez:
25
04
2023
Statut:
ppublish
Résumé
The status of plant and microbial nutrient limitation have profound impacts on ecosystem carbon cycle in permafrost areas, which store large amounts of carbon and experience pronounced climatic warming. Despite the long-term standing paradigm assumes that cold ecosystems primarily have nitrogen deficiency, large-scale empirical tests of microbial nutrient limitation are lacking. Here we assessed the potential microbial nutrient limitation across the Tibetan alpine permafrost region, using the combination of enzymatic and elemental stoichiometry, genes abundance and fertilization method. In contrast with the traditional view, the four independent approaches congruently detected widespread microbial nitrogen and phosphorus co-limitation in both the surface soil and deep permafrost deposits, with stronger limitation in the topsoil. Further analysis revealed that soil resources stoichiometry and microbial community composition were the two best predictors of the magnitude of microbial nutrient limitation. High ratio of available soil carbon to nutrient and low fungal/bacterial ratio corresponded to strong microbial nutrient limitation. These findings suggest that warming-induced enhancement in soil nutrient availability could stimulate microbial activity, and probably amplify soil carbon losses from permafrost areas.
Substances chimiques
Nitrogen
N762921K75
Phosphorus
27YLU75U4W
Soil
0
Carbon
7440-44-0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
3910-3923Subventions
Organisme : National Key Research and Development Program of China
ID : 2022YFF0801901
Organisme : National Natural Science Foundation of China
ID : 31988102
Organisme : National Natural Science Foundation of China
ID : 31825006
Organisme : National Natural Science Foundation of China
ID : 32101341
Organisme : The Second Tibetan Plateau Scientific Expedition and Research (STEP) Program
ID : 2019QZKK0106
Informations de copyright
© 2023 John Wiley & Sons Ltd.
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