Pedosphere 11(3): 199--208, 2001
ISSN 1002-0160/CN 32-1315/P
©2001 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of soil fertility and atmospheric CO2 enrichment on leaf, stem and root dark respiration of Populus tremuloides |
| X. Z. WANG1, P. S. CURTIS2 and C. S. VOGEL3 |
1 Columbia University, Palisades, New York 10964-8000 (USA)
2 The Ohio State University, Columbus, Ohio 43210-1293 (USA)
3 University of Michigan Biological Station, Pellston, Michigan 49769 (USA) |
| ABSTRACT |
| An open-top chamber experiment was conducted at the University of Michigan Biological Station near Pellston, Michigan, USA, to study the effects of soil fertility and CO2 on leaf, stem and root dark respiration (Rd) of Populus tremuloides. Overall, area-based daytime leaf Rd (Rda) was significantly greater at elevated than at ambient CO2 in high-fertility soil, but not in low-fertility soil. Mass-based leaf Rd (Rdm) was overall greater for high- than for low-fertility soil grown trees at elevated, but not at ambient CO2. Nighttime leaf Rda and Rdm were unaffected by soil fertility or CO2, nor was stem Rda, which ranged from 1.0 to 1.4 μmol m-2 s-1 in the spring and 3.5 to 4.5 μmol m-2 s-1 in the summer. Root Rda was significantly higher in high- than in low-fertility soil, but was unaffected by CO2. Since biomass production of P. tremuloides will be significantly greater at elevated CO2 while specific Rd will either increase or remain unchanged, we predict that carbon loss to the atmosphere through respiration from this ecologically important species would increase at higher CO2. Soil fertility would also interact with elevated CO2 in affecting the carbon flow in the plant-soil-air system. |
| Key Words: leaf dark respiration, Populus tremuloides, root respiration, soil fertility, stem respiration |
| Citation: Wang, X. Z., Curtis, P. S. and Vogel, C. S. 2001. Effects of soil fertility and atmospheric CO2 enrichment on leaf, stem and root dark respiration of Populus tremuloides. Pedosphere. 11(3): 199-208. |
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