期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 76, 期 -, 页码 297-300出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2014.04.020
关键词
Autotrophic respiration; Nitrogen fertilization; Soil CO2 efflux; Subtropical forest; Soil carbon
类别
资金
- National Natural Science Foundation of China [31000231]
- Open Foundation of Tiantong National Forest Ecosystem Research Station [TT201001]
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 (50 kg N ha(-1) yr(-1)) than the high-N treatment (100 kg N ha(-1) yr(-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. (C) 2014 Published by Elsevier Ltd.
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