NDLI: Productivity differences among loblolly pine genotypes are independent of individual-tree biomass partitioning and growth efficiency

Content Provider	Springer Nature Link
Author	Aspinwall, Michael J. King, John S. McKeand, Steven E.
Copyright Year	2012
Abstract	Genetic differences in individual-tree biomass partitioning, growth efficiency, and stem relative growth rate (RGR) could confer intraspecific productivity differences and might strongly influence forest ecosystem carbon storage. We examined the relationship between genotype productivity (stem volume), whole-tree biomass partitioning, growth efficiency (stem wood production per unit leaf area), and stem RGR among nine different loblolly pine (Pinus taeda L.) genotypes from three different genetic groups of contrasting inherent genetic homogeneity: three open-pollinated (half-sib) families, three mass-control pollinated (full-sib) families, and three clonal varieties. We hypothesized that genotype productivity would be positively associated with increased partitioning to stem wood relative to other plant parts, higher stem RGR, and enhanced growth efficiency. After 3 years under plantation conditions, genotypes showed significant differences in stem volume, percent stem wood, percent branch wood, and partitioning to fine roots, yet no differences in stem RGR or growth efficiency. Furthermore, genotypic differences in stem volume were independent of genotypic differences in biomass partitioning, and overall, we found no evidence to support the hypothesized relationships. Even so, the observed variation in biomass partitioning has implications for forest C sequestration as genotypes which partition more biomass to long-lived biomass pools such as stems, may sequester more C. Moreover, the lack of a genetic relationship between stem volume and belowground partitioning suggests that highly productive genotypes may be planted without compromising belowground C storage.
Starting Page	533
Ending Page	545
Page Count	13
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	27
Issue Number	3
e-ISSN	14322285
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Allometry Clone Growth efficiency Loblolly pine Productivity Forestry Plant Sciences Agriculture Plant Anatomy/Development Plant Pathology Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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