Ecophysiology of Seedlings of Oaks and Red Maple Across a Topographic Gradient in Eastern Kentucky
Throughout much of the eastern United States, oaks (Quercus spp.) are being replaced through natural succession by more shade-tolerant species. In Robinson Forest in eastern Kentucky, A. rubrum is numerically dominant in the understory and appears to be successionally replacing five oaks that occur at different topographic positions in upland forests. To help predict future succession, we compared A. rubrum and the five oaks in terms of patterns of gas exchange and water relations in understory seedlings subjected to artificial, saturating light levels. Physiological responses exhibited clear diurnal patterns, but were not strongly related to topography (mesic versus xeric aspects). Despite their different topographic distributions, oaks differed only minimally in responses. The lack of oak species and topographic effects on physiology may have stemmed from nonlimiting moisture conditions during the study. In contrast, A. rubrum exhibited very low A and gww and very high leaf compared to the oaks. Furthermore, in the oaks, A was controlled mainly by gwv, whereas in A. rubrum, leaf and Tleaf were more strongly correlated with A than was gwv probably reflecting relatively low dehydration tolerance in A. rubrum leaves. Future light regimes should be enhanced by gap-phase dynamics. Under these conditions, the higher photosynthetic capacity of oaks compared to A. rubrum may contribute to higher leaf carbon gain. On the other hand, abundant tall understory A. rubrum may continue preempting light from smaller oak juveniles, promoting eventual replacement of oaks by A. rubrum at Robinson Forest. For. Sci. 42(3):335-342.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
Document Type: Journal Article
Affiliations: Associate Professor in the Center for Ecology, Evolution, and Behavior and the T H. Morgan School of Biological Sciences at the University of Kentucky, Lexington, KY 40506
Publication date: 1996-08-01
More about this publication?
- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
Forest Science is published bimonthly in February, April, June, August, October, and December.
2016 Impact Factor: 1.782 (Rank 17/64 in forestry)
Average time from submission to first decision: 62.5 days*
June 1, 2016 to Feb. 28, 2017
Also published by SAF:
Journal of Forestry
Other SAF Publications
- Submit a Paper
- Membership Information
- Author Guidelines
- Ingenta Connect is not responsible for the content or availability of external websites