Gender-specific responses of Populus tremuloides to atmospheric CO2 enrichment
Article first published online: 21 DEC 2001
Volume 150, Issue 3, pages 675–684, June 2001
How to Cite
Wang, X. and Curtis, P. S. (2001), Gender-specific responses of Populus tremuloides to atmospheric CO2 enrichment. New Phytologist, 150: 675–684. doi: 10.1046/j.1469-8137.2001.00138.x
- Issue published online: 21 DEC 2001
- Article first published online: 21 DEC 2001
- Received: 30 October 2000 Accepted: 29 January 2001
- elevated CO2;
- gender-specific variation;
- leaf dark respiration;
- Populus tremuloides;
- soil nitrogen availability
- •Dioecious species represent an important component of terrestrial ecosystems, but little is known about gender-specific responses to elevated atmospheric CO2.
- •In an open-top chamber experiment carried out in Michigan, USA, the physiological and growth responses were studied of male and female Populus tremuloides to elevated CO2 and soil nitrogen concentrations.
- •Male trees had a higher net photosynthetic rate than female trees, but the difference was greater at elevated (25%) than at ambient (13%) CO2. Leaf dark respiration, averaged across the growing season, tended to be higher in males than in females, and increased significantly in male and female trees with CO2 enrichment. Female trees had higher total biomass than male trees grown in low-nitrogen soil and at ambient CO2, but not in other treatments. Elevated CO2 increased the total biomass of males by 58–66% and of females by 22–70%.
- •Differing physiological and growth responses to CO2 enrichment by male and female trees should be taken into consideration when predicting the effects of global environmental changes on forest ecosystem structure and functioning.