Effects of nitrogen on leaf physiology and growth of different families of loblolly and slash pine |
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| Authors: | Samuelson LJ |
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| Institution: | (1) School of Forestry, Auburn University, 224 M. White Smith Hall, AL, 36849-5418 |
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| Abstract: | Leaf physiology and fractional dry weight allocation were examined in four open-pollinated families of loblolly pine (Pinus taeda L.) and slash pine (Pinus elliottii Englm. var. elliottii) in response to growth under low and high N supply for six months. Nitrogen greatly influenced dry weight allocation, total mass, leaf net photosynthesis and leaf conductance in seedlings of both species. Family variation in fine root allocation was observed under low but not high N treatment, but for the majority of physiological and growth traits, family variation was stable under varying N treatment. Family rankings based on juvenile height, diameter and biomass accretion were similar to rankings based on field performance at 22 years in slash pine but not loblolly pine. Lower leaf maintenance respiration rates were associated with families exhibiting the most rapid juvenile growth. |
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| Keywords: | dark respiration dry weight allocation net photosynthesis Pinus taeda Pinus elliottii |
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