Differing Diffusive Resistance and Leaf Development May Cause Differing Transpiration Among Hardwoods in Spring
Abstract:Buds of several Betula and Prunus species and of Populus tremuloides broke before those of other species in spring, exposing green leaves having diffusive resistances as low as 5 s/cm. Leaves of Acer saccharum and Fagus grandifolia unfolded 10 days later and initially had resistances around 7 s/cm. Quercus rubra and Q. coccinea leaves developed still later, were initially chlorotic, and had resistances over 10 s/cm. This initially high resistance may help to reduce transpiration in these ring-porous species until the conducting system of the new annual ring is well developed. Resistance decreased during and after leaf expansion to final values of 3 to 5 s/cm in all species. Resistances of adaxial surfaces of all species were nearly always greater than 30 s/cm. Apparently in newly unfolded leaves, cuticular resistance is high, but in some species, stomata are open. Both leaf area and diffusive resistance can limit transpiration in spring. The product of diffusive conductance and leaf length squared indicated that transpiration begins several weeks earlier in Betula and P. tremuloides than in Quercus; Prunus, A. saccharum, and F. grandifolia are intermediate. Forest Sci. 22:359-364.
Document Type: Journal Article
Affiliations: Principal Meteorologist, Northeastern Forest Experiment Station, Forestry Sciences Laboratory, USDA Forest Service, Durham, N.H. 03824
Publication date: 1976-09-01
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