Net Assimilation Rate and Growth in Loblolly Pine Seedlings
Abstract:Loblolly pine (Pinus taeda L.) progenies from controlled crosses showed genetic variation in the seasonal pattern of net assimilation and dry weight growth. The rank of progenies in net assimilation rate (NAR) changed during the first growing season. A progeny group characterized by a high NAR shortly after germination may subsequently have a low rate in comparison with other progeny groups; i.e. the curves of NAR over time intersect. Dry matter production at 21 weeks is related to the area under the seasonal curve of NAR with a linear correlation of 0.80. This correlation relates assimilation rate and growth and indicates that both intensity anti intensity-duration aspects of photosynthesis and respiration are important to dry matter production.
Document Type: Journal Article
Affiliations: Assoc. Professor of Forest Genetics, N. C. State Univ., Raleigh
Publication date: 1969-12-01
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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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