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Photosynthesis, Leaf Conductance, and Specific Leaf Weight in Long and Short Shoots of Populus 'Tristis #1' Grown Under Intensive Culture

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Differences between second-order, midcrown, long and short shoots in photosynthetic rate, leaf conductance, and specific leaf weight were evaluated for a 4-year-old plantation of hybrid clone Populus 'Tristis #1' (P. balsamifera X P. tristis; NC 5260) grown under short rotation intensive culture (SRIC) in northern Wisconsin. Photosynthetic rates (14CO2 method) and abaxial leaf conductance were measured in situ for all leaves on short shoots and for tip, midshoot, and basal leaves on long shoots, at midday in July and August under natural diffuse light, sunflecks excluded (5-21 E m-2 s-1; photosynthetic photon flux density) and at full insolation (800-1,850 E m-2 s-1 photosynthetic photon flux density). Specific leaf weight of the same leaves was determined on the same day. Short-shoot photosynthetic rates per dmĀ² and per g averaged 71 and 82 percent, respectively, of long-shoot rates. Long-shoot leaves also had higher specific leaf weights than short-shoot leaves. Differences in abaxial leaf conductance between long and short shoots were small and not significant. The lower average age of long-shoot leaves is probably an important reason for the greater photosynthetic rates of the long shoots. These results suggest that long and short shoots should be treated as separate populations when modelling net assimilation in SRIC poplars. Forest Sci. 28:737-744.
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Keywords: SRIC; Short rotation; diffusive resistance; net assimilation; stomatal resistance

Document Type: Journal Article

Affiliations: Graduate Research Assistant, Department of Forestry, Michigan State University, East Lansing, MI 48824

Publication date: 1982-12-01

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    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.
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    June 1, 2016 to Feb. 28, 2017

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