Premium
Responses of terrestrial nitrogen pools and dynamics to different patterns of freeze‐thaw cycle: A meta‐analysis
Author(s) -
Gao Decai,
Zhang Lei,
Liu Jun,
Peng Bo,
Fan Zhenzhen,
Dai Weiwei,
Jiang Ping,
Bai Edith
Publication year - 2018
Publication title -
global change biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.146
H-Index - 255
eISSN - 1365-2486
pISSN - 1354-1013
DOI - 10.1111/gcb.14010
Subject(s) - cycling , tundra , ecosystem , environmental science , nitrogen cycle , terrestrial ecosystem , nitrification , mineralization (soil science) , biogeochemical cycle , nutrient cycle , nutrient , leaching (pedology) , temperate climate , ecology , climate change , nitrogen , environmental chemistry , soil water , chemistry , biology , soil science , forestry , organic chemistry , geography
Altered freeze‐thaw cycle ( FTC ) patterns due to global climate change may affect nitrogen (N) cycling in terrestrial ecosystems. However, the general responses of soil N pools and fluxes to different FTC patterns are still poorly understood. Here, we compiled data of 1519 observations from 63 studies and conducted a meta‐analysis of the responses of 17 variables involved in terrestrial N pools and fluxes to FTC . Results showed that under FTC treatment, soil NH 4 + , NO 3 − , NO 3 − leaching, and N 2 O emission significantly increased by 18.5%, 18.3%, 66.9%, and 144.9%, respectively; and soil total N ( TN ) and microbial biomass N ( MBN ) significantly decreased by 26.2% and 4.7%, respectively; while net N mineralization or nitrification rates did not change. Temperate and cropland ecosystems with relatively high soil nutrient contents were more responsive to FTC than alpine and arctic tundra ecosystems with rapid microbial acclimation. Therefore, altered FTC patterns (such as increased duration of FTC , temperature of freeze, amplitude of freeze, and frequency of FTC ) due to global climate warming would enhance the release of inorganic N and the losses of N via leaching and N 2 O emissions. Results of this meta‐analysis help better understand the responses of N cycling to FTC and the relationships between FTC patterns and N pools and N fluxes.