Journal
PLANT AND SOIL
Volume 372, Issue 1-2, Pages 597-608Publisher
SPRINGER
DOI: 10.1007/s11104-013-1758-1
Keywords
Temperature sensitivity; Nitrogen deposition; Land use type; Carbon mineralization; Nitrogen mineralization
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Funding
- China Scholarship Council
- China Opportunity Fund of the University of Alberta
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- National Research Council of China (NSFC)
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Climate warming, nitrogen (N) deposition and land use change are some of the drivers affecting ecosystem processes such as soil carbon (C) and N dynamics, yet the interactive effects of those drivers on ecosystem processes are poorly understood. This study aimed to understand mechanisms of interactive effects of temperature, form of N deposition and land use type on soil C and N mineralization. We studied, in a laboratory incubation experiment, the effects of temperature (15 vs. 25 A degrees C) and species of N deposition (NH4 (+)-N vs. NO3 (-)-N) on soil CO2 efflux, dissolved organic C (DOC) and N (DON), NH4 (+)-N, and NO3 (-)-N concentrations using intact soil columns collected from adjacent forest and grassland ecosystems in north-central Alberta. Temperature and land use type interacted to affect soil CO2 efflux, concentrations of DON, NH4 (+)-N and NO3 (-)-N in most measurement times, with the higher incubation temperature resulted in the higher CO2 efflux and NH4 (+)-N concentrations in forest soils and higher DON and NO3 (-)-N concentrations in grassland soils. Temperature and land use type affected the cumulative soil CO2 efflux, and DOC, DON, NH4 (+)-N and NO3 (-)-N concentrations. The form of N added or its interaction with the other two factors did not affect any of the C and N cycling parameters. Temperature and land use type were dominant factors affecting soil C loss, with the soil C in grassland soils more stable and resistant to temperature changes. The lack of short-term effects of the deposition of different N species on soil C and N mineralization suggest that maybe there was a threshold for the N effect to kick in and long-term experiments should be conducted to further elucidate the species of N deposition effects on soil C and N cycling in the studied systems.
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