Phosphorus rather than nitrogen regulates ecosystem carbon dynamics after permafrost thaw

Ecosystem carbon (C) dynamics after permafrost thaw depends on more than just climate change since soil nutrient status may also impact ecosystem C balance. It has been advocated that nitrogen (N) release upon permafrost thaw could promote plant growth and thus offset soil C loss. However, compared...

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Bibliographic Details
Published in:Global Change Biology
Main Authors: Yang, Guibiao, Peng, Yunfeng, Abbott, Benjamin W., Biasi, Christina, Wei, Bin, Zhang, Dianye, Wang, Jun, Yu, Jianchun, Li, Fei, Wang, Guanqin, Kou, Dan, Liu, Futing, Yang, Yuanhe
Format: Article in Journal/Newspaper
Language:English
Published: WILEY 2021
Subjects:
carbon cycle
carbon fluxes
carbon-climate feedback
climate warming
nutrient availability
thermokarst
Biodiversity Conservation
Ecology
Environmental Sciences
CO2 FLUX
SOIL
TUNDRA
AVAILABILITY
PRODUCTIVITY
DEGRADATION
LIMITATION
PLATEAU
ALASKA
Science Citation Index Expanded (SCI-EXPANDED)
permafrost
Thermokarst
Tundra
Alaska
Online Access:http://ir.ibcas.ac.cn/handle/2S10CLM1/26473
https://doi.org/10.1111/gcb.15845
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Summary:Ecosystem carbon (C) dynamics after permafrost thaw depends on more than just climate change since soil nutrient status may also impact ecosystem C balance. It has been advocated that nitrogen (N) release upon permafrost thaw could promote plant growth and thus offset soil C loss. However, compared with the widely accepted C-N interactions, little is known about the potential role of soil phosphorus (P) availability. We combined 3-year field observations along a thaw sequence (constituted by four thaw stages, i.e., non-collapse and 5, 14, and 22 years since collapse) with an in-situ fertilization experiment (included N and P additions at the level of 10 g N m(-2) year(-1) and 10 g P m(-2) year(-1)) to evaluate ecosystem C-nutrient interactions upon permafrost thaw. We found that changes in soil P availability rather than N availability played an important role in regulating gross primary productivity and net ecosystem productivity along the thaw sequence. The fertilization experiment confirmed that P addition had stronger effects on plant growth than N addition in this permafrost ecosystem. These two lines of evidence highlight the crucial role of soil P availability in altering the trajectory of permafrost C cycle under climate warming.

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