Hasselquist, Niles
- Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
Sammanfattning
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.
Nyckelord
Autotrophic respiration; Nitrogen fertilization; Soil CO2 efflux; Subtropical forest; Soil carbon
Publicerad i
Soil Biology and Biochemistry
2014, volym: 76, sidor: 297-300
Utgivare: PERGAMON-ELSEVIER SCIENCE LTD
SLU författare
Palmroth, Sari
- Duke University
Globala målen (SDG)
SDG13 Bekämpa klimatförändringarna
UKÄ forskningsämne
Skogsvetenskap
Publikationens identifierare
- DOI: https://doi.org/10.1016/j.soilbio.2014.04.020
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/60414