Comparative Growth and Photosynthesis of Black Walnut and Honeylocust Seedlings
Abstract:Growth and photosynthetic efficiency were measured periodically during the first year of growth of black walnut (Juglans nigra L.) and honeylocust (Gleditsia triacanthos L.) seedlings. The species distinctly differed in developmental changes including cumulative height growth, leaf area accretion, and dry matter accumulation in leaves, stem and roots. Both species had similar net assimilation rates during the log phase of growth. Honeylocust was superior to black walnut in rate of net photosynthesis per unit of leaf area. Black walnut had a higher rate of net photosynthesis per seedling because of its greater total leaf surface area. Net photosynthesis increased gradually in honeylocust seedlings and reached a peak incorporation of 15.5 mg CO2 dm-2 hr-1 on August 10 and remained at a high level through September 21 as leaf abscission began. Net photosynthesis in black walnut reached a peak level of incorporation of 7.8 mg CO2 dm-2 hr-1 on July 27 and then declined sharply to a low level of 1.3 mg CO2 dm-2 hr-1 on September 7. Rates of net photosynthesis, dark respiration, and photorespiration varied greatly among individual seedlings of both species. Rates of CO2 evolution for dark respiration were as high as 10 mg CO2 dm-2 hr-1 for black walnut and 13 mg CO2 dm-2 hr-1 for honeylocust. Photorespiration rates ranged as high as 9 mg CO2 dm-2 hr-1 in black walnut and 22 mg CO2 dm-2 hr-1 for honeylocust. Forest Sci. 20:317-324.
Document Type: Journal Article
Affiliations: Professor, Department of Forestry, Michigan State University
Publication date: 1974-12-01
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