Short-term response of soil respiration to nitrogen fertilization in a subtropical evergreen forest
Little is known about the effects of nitrogen (N) additions on soil respiration (Rs) in tropical and subtropical forests. We therefore conducted an N-fertilization experiment in a subtropical evergreen forest in eastern China to better understand the short-term response of Rs to increased N availability. N additions stimulated Rs compared to control plots, yet the magnitude of the increase depended on the amount of N added, with Rs being greater in the low-N treatment (50kgNha-1yr-1) than the high-N treatment (100kgNha-1yr-1). Differences in Rs among treatments correlated with changes in fine root biomass, suggesting increases in Rs reflect those in autotrophic respiration. Our findings challenge the dogma that N fertilization often reduces soil respiration and highlights the need to better understand the effects of low N additions, so as to reliably predict how projected climate change scenarios may affect the cycling of soil carbon (C) in tropical and subtropical forests. © 2014.
Duke Scholars
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- Agronomy & Agriculture
- 4106 Soil sciences
- 07 Agricultural and Veterinary Sciences
- 06 Biological Sciences
- 05 Environmental Sciences
Citation
Published In
DOI
ISSN
Publication Date
Volume
Start / End Page
Related Subject Headings
- Agronomy & Agriculture
- 4106 Soil sciences
- 07 Agricultural and Veterinary Sciences
- 06 Biological Sciences
- 05 Environmental Sciences