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Comparative Growth and Photosynthesis of Black Walnut and Honeylocust Seedlings

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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.

Keywords: Dark respiration; Gleditsia triacanthos L; Juglans nigra L; comparative physiology; photorespiration

Document Type: Journal Article

Affiliations: Professor, Department of Forestry, Michigan State University

Publication date: 1974-12-01

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 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
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