Genetic and Nutritional Effects on Stem Sinuosity in Loblolly Pine.

Show simple item record

dc.contributor.advisor J. S. King, Committee Member en_US
dc.contributor.advisor S. E. McKeand, Committee Co-Chair en_US
dc.contributor.advisor H. L. Allen, Committee Co-Chair en_US
dc.contributor.advisor I. M. Peszlen, Committee Member en_US
dc.contributor.advisor P. M. Dougherty, Committee Member en_US Espinoza, Jesus Alberto en_US 2010-04-02T18:50:59Z 2010-04-02T18:50:59Z 2009-01-22 en_US
dc.identifier.other etd-01172009-084805 en_US
dc.description.abstract Genetically improved loblolly pine (Pinus taeda L.) trees under intensive silviculture have demonstrated dramatic increases in wood production. However, increased input intensity has been associated with a higher propensity for certain genotypes to increase stem and branch deformities, as well as reduced disease resistance. The responses of several genotypes of loblolly pine to nutrient additions on stem sinuosity were assessed at three and twelve years of age in two different tests located in South Carolina and North Carolina, respectively. The objectives of the studies were to assess the effect of nutrient additions and genetics on stem form, particularly stem sinuosity, in loblolly pine. Tissue samples from of each newly expanding shoots at the beginning of growing season were taken and analyzed to assess the association between the nutrient concentrations on the tissues and stem sinuosity in five families from two provenances (Atlantic Coastal Plain “ACP†and Lost Pine Texas “LPT†). The second study was established at the ArborGen research facility near Summerville, South Carolina, with six different genotypes of loblolly pine to determine whether high N and low Ca availability caused sinuous growth. In early spring, eight blocks were fertilized with N as (NH4)2SO4 and Ca as CaSO4. Nutrient concentrations from flushing shoot tissue were examined and then correlated with measures of stem sinuosity. Results from the study of repeated nutrient additions in North Carolina showed that the addition of nutrients increased stem sinuosity, branch sinuosity, height, and the levels of N, P, K, Mg, Zn, B and S in the woody tissue of newly expanding shoot and decreased the levels of Mn and Cu. Calcium levels were the same in both treatments. Stem sinuosity was positively correlated with tissue nitrogen (N) concentration, while negatively correlated with manganese (Mn) levels. Negative family-mean correlations between N and Mn were found in both treatments (control and fertilized). There was a negative family-mean correlation between Mn and the height of the trees in the control and fertilized treatments. Differences in stem sinuosity and nutrient uptake were found among families within provenance, indicating a potential to reduce sinuosity by using genetic selection and appropriate nutrient additions. The study where only N and Ca were added showed that nitrogen additions caused significant increases in both stem sinuosity and N concentrations. Calcium additions reduced stem sinuosity only when N was added, and did not significantly change in Ca concentrations in the flushing shoot tissue. Manganese (Mn), Ca, N and phosphorus (P) concentrations were all positive correlated with stem sinuosity. The study from North Carolina showed also that in contrast with sweep, stem straightness, forking, and ramicorn branching were all negatively impacted (become worse) by the nutrient addition, especially in the LPT provenance. The ACP provenance showed 34% more susceptibility to fusiform rust than the LPT provenance. Based on our findings, nutrient additions, especially N, increased not only stem and branch sinuosity but also increased the deformations in other stem traits such on stem traits such straightness, forking, and ramicorn branching and it also increased the proportion of the trees infected with fusiform rust. However, Ca addition reduced the negative impact of N addition on stem sinuosity. Provenance and family differences were also found. Therefore, stem form traits are clearly affected by environmental differences and by genetics. This highlights the importance of matching appropriate site and cultural treatments with suitable genotypes. The choice of these three components has a large impact on the productivity and quality of the plantation. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject stem form traits. en_US
dc.subject Loblolly pine en_US
dc.subject provenance en_US
dc.subject fertilization en_US
dc.subject nutrition en_US
dc.subject nutrients en_US
dc.title Genetic and Nutritional Effects on Stem Sinuosity in Loblolly Pine. en_US PhD en_US dissertation en_US Forestry en_US

Files in this item

Files Size Format View
etd.pdf 486.3Kb PDF View/Open

This item appears in the following Collection(s)

Show simple item record