Natural abundance of 13C in CO2 respired from forest soils reveals speed of link between tree photosynthesis and root respiration

@article{Ekblad2001NaturalAO,
  title={Natural abundance of 13C in CO2 respired from forest soils reveals speed of link between tree photosynthesis and root respiration},
  author={Alf Ekblad and Peter H{\"o}gberg},
  journal={Oecologia},
  year={2001},
  volume={127},
  pages={305-308}
}
Soil respiration from a boreal mixed coniferous forest showed large seasonal variation in natural abundance of 13C, ranging from –21.6‰ to –26.5‰. We tested if weather conditions could explain this variation in δ13C of respired CO2, and found that the air relative humidity 1–4 days before the days of CO2 sampling best explained the variation. This suggested that high δ13C values were caused by effects of air humidity on isotope fractionation during photosynthesis and that it took 1–4 days for… CONTINUE READING