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Intensified plant N and C pool with more available nitrogen under experimental warming in an alpine meadow ecosystem.


ABSTRACT: Nitrogen (N) availability is projected to increase in a warming climate. But whether the more available N is immobilized by microbes (thus stimulates soil carbon (C) decomposition), or is absorbed by plants (thus intensifies C uptake) remains unknown in the alpine meadow ecosystem. Infrared heaters were used to simulate climate warming with a paired experimental design. Soil ammonification, nitrification, and net mineralization were obtained by in situ incubation in a permafrost region of the Qinghai-Tibet Plateau (QTP). Available N significantly increased due to the stimulation of net nitrification and mineralization in 0-30 cm soil layer. Microbes immobilized N in the end of growing season in both warming and control plots. The magnitude of immobilized N was lower in the warming plots. The root N concentration significantly reduced, but root N pool intensified due to the significant increase in root biomass in the warming treatment. Our results suggest that a warming-induced increase in biomass is the major N sink and will continue to stimulate plant growth until plant N saturation, which could sustain the positive warming effect on ecosystem productivity.

SUBMITTER: Peng F 

PROVIDER: S-EPMC5167058 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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Intensified plant N and C pool with more available nitrogen under experimental warming in an alpine meadow ecosystem.

Peng Fei F   Xue Xian X   You Quangang Q   Xu Manhou M   Chen Xiang X   Guo Jian J   Wang Tao T  

Ecology and evolution 20161106 23


Nitrogen (N) availability is projected to increase in a warming climate. But whether the more available N is immobilized by microbes (thus stimulates soil carbon (C) decomposition), or is absorbed by plants (thus intensifies C uptake) remains unknown in the alpine meadow ecosystem. Infrared heaters were used to simulate climate warming with a paired experimental design. Soil ammonification, nitrification, and net mineralization were obtained by in situ incubation in a permafrost region of the Qi  ...[more]

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