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DOI 10.2172/14934
Title Control of Growth Efficiency in Young Plantation Loblolly Pine and Sweetgum through Irrigation and Fertigation Enhancement of Leaf Carbon Gain
Creator/Author L. Samuelson
Publication Date1999 Jul 07
OSTI IdentifierOSTI ID: 14934
Report Number(s)DOE/ID/13528
DOE Contract NumberFC07-97ID13528
DOI10.2172/14934
Other Number(s)TRN: AH200130%%186
Resource TypeTechnical Report
Resource RelationOther Information: PBD: 7 Jul 1999
CoverageFinal
Research OrgUSDOE Idaho Operations Office, Idaho Falls, ID (US); Auburn University, Auburn, AL (US)
Sponsoring OrgUSDOE Office of Energy Efficiency and Renewable Energy (EE) (US)
Subject54 ENVIRONMENTAL SCIENCES; 60 APPLIED LIFE SCIENCES; CARBON; EFFICIENCY; IRRIGATION; PEST CONTROL; PHOTOSYNTHESIS; PINES; VAPOR PRESSURE
Related SubjectFOREST MANAGEMENT; RESOURCE AUGMENTATION; IRRIGATION; FERTIGATION; PEST CONTROL; CROWN DEVELOPMENT; SELF-SHADING; LEAF MASS; WHOLE TREE CARBON; LEAF LEVEL CARBON; GROWTH EFFICIENCY
Description/AbstractThe overall objective of this study was to determine if growth efficiency of young plantation loblolly pine and sweetgum can be maintained by intensive forest management and whether increased carbon gain is the mechanism controlling growth efficiency response to resource augmentation. Key leaf physiological processes were examined over two growing seasons in response to irrigation, fertigation (irrigation with a fertilizer solution), and fertigation plus pest control (pine only). Although irrigation improved leaf net photosynthesis in pine and decreased stomatal sensitivity to vapor pressure deficit in sweetgum, no consistent physiological responses to fertigation were detected in either species. After 4 years of treatment, a 3-fold increase in woody net primary productivity was observed in both species in response to fertigation. Trees supplemented with fertigation and fertigation plus pest control exhibited the largest increases in growth and biomass. Furthermore, growth efficiency was maintained by fertigation and fertigation plus pest control, despite large increases in crown development and self-shading. Greater growth in response to intensive culture was facilitated by significant gains in leaf mass and whole tree carbon gain rather than detectable increases in leaf level processes. Growth efficiency was not maintained by significant increases in leaf level carbon gain but was possibly influenced by changes in carbon allocation to root versus shoot processes.
Country of PublicationUnited States
LanguageEnglish
FormatMedium: P; Size: 18 pages
Availability OSTI as DE00014934
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System Entry Date2008 Feb 04
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