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Below-ground carbon allocation in mature beech and spruce trees following long-term, experimentally enhanced O 3 exposure in Southern Germany

Environmental Pollution, ISSN: 0269-7491, Vol: 158, Issue: 8, Page: 2604-2609
2010
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Article Description

Canopies of adult European beech ( Fagus sylvatica ) and Norway spruce ( Picea abies ) were labeled with CO 2 depleted in 13 C to evaluate carbon allocation belowground. One-half the trees were exposed to elevated O 3 for 6 yrs prior to and during the experiment. Soil-gas sampling wells were placed at 8 and 15 cm and soil CO 2 was sampled during labeling in mid-late August, 2006. In beech, δ 13 CO 2 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 δ 13 CO 2. 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 O 3 exposure was not observed.

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