Abstract
Canopies of adult European beech (Fagus sylvatica) and Norway spruce (Picea abies) were labeled with CO2 depleted in 13C to evaluate carbon allocation belowground. One-half the trees were exposed to elevated O3 for 6 yrs prior to and during the experiment. Soil-gas sampling wells were placed at 8 and 15 cm and soil CO2 was sampled during labeling in mid-late August, 2006. In beech, δ13CO2 at both depths decreased approximately 50 h after labeling, reflecting rapid translocation of fixed C to roots and release through respiration. In spruce, label was detected in fine-root tissue, but there was no evidence of label in δ13CO2. The results show that C fixed in the canopy rapidly reaches respiratory pools in beech roots, and suggest that spruce may allocate very little of recently-fixed carbon into root respiration during late summer. A change in carbon allocation belowground due to long-term O3 exposure was not observed.
Original language | English |
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Pages (from-to) | 2604-2609 |
Number of pages | 6 |
Journal | Environmental Pollution |
Volume | 158 |
Issue number | 8 |
DOIs | |
State | Published - Aug 2010 |
Keywords
- Carbon allocation
- Fagus sylvatica
- Ozone
- Picea abies
- Soil-respired CO
- δ CO