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Tim Martin   Dr.  University Educator/Researcher 
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Tim Martin published an article in January 2015.
Top co-authors See all
Wendell P. Cropper

24 shared publications

Wendell P. Cropper Jr. (), University of Florida

Dudley A. Huber

22 shared publications

University of Florida

Salvador A. Gezan

21 shared publications

Salvador A. Gezan (), University of Florida

Lois Wright Morton

20 shared publications

John M. Davis

15 shared publications

University of Florida

Publication Record
Distribution of Articles published per year 
(2004 - 2015)
Total number of journals
published in
Article 1 Read 2 Citations Architectures of adaptive integration in large collaborative projects Lois Wright Morton, Sanford D. Eigenbrode, Timothy A. Martin Published: 01 January 2015
Ecology and Society, doi: 10.5751/es-07788-200405
DOI See at publisher website
Article 2 Reads 0 Citations Individual Tree Diameter, Height, and Volume Functions for Longleaf Pine Carlos A. Gonzalez-Benecke, Daniel J. Leduc, Salvador A. Gez... Published: 28 February 2014
Forest Science, doi: 10.5849/forsci.12-074
DOI See at publisher website
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Currently, little information is available to estimate individual tree attributes for longleaf pine (Pinus palustris Mill.), an important tree species of the southeastern United States. The majority of available models are local, relying on stem diameter outside bark at breast height (dbh, cm) and not including stand-level parameters. We developed a set of individual tree equations to predict tree height (H, m), stem diameter inside bark at 1.37 m height (dbhIB, cm), stem volume outside bark (VOB, m3), and stem volume inside bark (VIB, m3), as well as functions to determine merchantable stem volume ratio (both outside and inside bark) from the stump to any top diameter. Local and general models are presented for each tree attribute. General models included stand-level parameters such as age, site index, dominant height, basal area, and tree density. The user should decide which model type to use, depending on data availability and level of accuracy desired. To our knowledge, this is the first comprehensive individual tree-level set of equations reported for longleaf pine trees, including local and general models, which can be applied to longleaf pine trees over a large geographical area and across a wide range of ages and stand characteristics. The system presented here provides important new tools for supporting future longleaf pine management decisions.
Article 0 Reads 0 Citations Relative contributions of crown and phenological traits to growth of a pseudo-backcross pine family ((slash × loblolly) ... Patricio R. Muñoz Valle, Dudley A. Huber, Timothy A. Martin,... Published: 30 May 2012
Tree Genetics & Genomes, doi: 10.1007/s11295-012-0514-7
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One pseudo-backcross [(slash × loblolly) × slash] (BC1) and open-pollinated families of the pure species progenitors were established in a single test in North Central Florida. Multivariate analysis was used to estimate the intra-trait correlation among the taxa, and path analyses were used to determine the relative contributions of crown architectural and phenological traits to first-year height growth. The multivariate analysis indicated that BC1, slash, and loblolly pine have different relationships among the traits studied, suggesting that a separate path analysis was required for each taxon. Path analysis coefficients of determination of the final models were 0.69, 0.73, and 0.65 for the pseudo-backcross, loblolly, and slash pine families, respectively. The ranking of traits by relative magnitude of effect on total growth was, for the pseudo-backcross crown projected area (CPA), fascicle length (FL), number of nodes (NN), number of branches (NB), number of needles per fascicle (NF), and fascicle diameter. For loblolly, this was CPA, NB, FL, NN, NF, initiation, and specific leaf area. For slash, this was CPA, NN, FL, NF, and NB. The study indicated that all crown traits considered in the path analysis had moderate effects on first-year height growth, with the exceptions of the consistently large effect of CPA and the minimal effect of the phenological traits.
Article 1 Read 6 Citations Inheritance of foliar stable carbon isotope discrimination and third-year height in Pinus taeda clones on contrasting si... Brian S. Baltunis, Timothy A. Martin, Dudley A. Huber, John ... Published: 22 April 2008
Tree Genetics & Genomes, doi: 10.1007/s11295-008-0152-2
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Quantifying foliar stable carbon isotope discrimination (Δ) is a powerful approach for understanding genetic variation in gas exchange traits in large populations. The genetic architecture of Δ and third-year height is described for more than 1,000 clones of Pinus taeda tested on two contrasting sites. \(\hat h^2 \) for Δ was 0.14 (±0.03), 0.20 (±0.07), and 0.09 (±0.04) at Florida, Georgia, and across sites, respectively. \(\hat H^2 \) for stable carbon isotope discrimination ranged from 0.25 (±0.03) at the Florida site to 0.33 (±0.03) at the Georgia site, while the across-site estimate of \(\hat H^2 \) was 0.19 (±0.02). For third-year height, \(\hat h^2 \) ranged from 0.13 (±0.05) at the Georgia site to 0.20 (±0.06) at the Florida site with an across-site estimate of 0.09 (±0.05). Broad-sense heritability estimates for third-year height were 0.23 (±0.03), 0.28 (±0.03), and 0.13 (±0.02) at the Florida site, Georgia site, and across sites, respectively. Type B total genetic correlation for Δ was 0.70 ± 0.06, indicating that clonal rankings were relatively stable across sites, while for third-year height, rankings of clones were more unstable across the two trials \(\left( {\hat r_{B_{TG} } = 0.55 \pm 0.08} \right)\) . Third-year height and Δ were negatively correlated at the parental \(\left( {\hat r_{ADD} = - 0.42 \pm 0.33} \right)\) , full-sib family \(\left( {\hat r_{FS} = - 0.54 \pm 0.25} \right)\) , and clonal \(\left( {\hat r_{TG} = - 0.30 \pm 0.11} \right)\) levels, suggesting that genetic variation for Δ in P. taeda may be a result of differences in photosynthetic capacity. We conclude that Δ may be a useful selection trait to improve water-use efficiency and for guiding deployment decisions in P. taeda.
Article 1 Read 14 Citations Integrating within-crown variation in net photosynthesis in loblolly and slash pine families Robert C. McGarvey, Timothy A. Martin, Timothy L. White Published: 01 November 2004
Tree Physiology, doi: 10.1093/treephys/24.11.1209
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We examined photosynthetic characteristics of two fast- and two slow-growing half-sib families of both loblolly pine (Pinus taeda L.) and slash pine (Pinus elliottii var. elliottii Engelm.) on two sites in northern Florida to: (1) quantify variation in light-saturated net photosynthesis (Amax) associated with vertical crown position and foliage age; (2) quantify the amount and distribution of leaf area by foliage age class; and (3) determine whether photosynthetic indices, ranging from leaf-level through whole-crown Amax, were related to growth differences among species and families. In both species, leaf-level Amax was higher in more recently formed foliage both within the same year (where Amax in the third flush averaged 10 to 30% higher than Amax in the first flush) and between years (where Amax in current-year foliage averaged 20 to 40% higher than Amax in 1-year-old foliage). When expressed on a leaf area basis, Amax of current-year foliage was higher in slash pine than in loblolly pine, but Amax expressed on a mass basis did not differ between species. Loblolly pine had higher whole-tree leaf area than slash pine, whereas whole-tree Amax did not differ between species. When the mean values for fast-growing families were compared with the mean values for slow-growing families, there were no differences in leaf-level characteristics, whereas at the whole-tree level, fast-growing families had higher leaf area and whole-tree Amax than slow-growing families in both species. When comparisons were made among the individual fast- and slow-growing families, however, results were more variable. In both species, stem volume growth was strongly correlated with whole-tree Amax, with most of the strength of the correlation deriving from the relationship between volume growth and tree leaf area.