Service Forester's Handbook

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====== Site Index Curves ======
===== Loblolly Pine 25 Year Basis =====
{{::loblolly25yrs.jpg|}}

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      var options = {
        title: 'Loblolly Pine 25 Year Basis',
        containerId: 'chartdiv',
        baseAge: 25,
        bVars: [-2.41737, -273.824, 4227.7, -19758.5],
        ageMin: 0,
        ageMax: 70,
        ageStep: 5,
        siMin: 40,
        siMax: 80,
        siStep: 10
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      siteIndexChart = new SiteIndexChart(options);
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--Site index curves for loblolly pine at index age 25 years in the coastal plain of Virginia,
North Carolina, and South Carolina. (These curves are based stem analysis of 40 dominant trees
in the middle and lower Coastal Plain.)

===Test and Comparison of Site Index Curves===
Seventy-four permanent growth plots in another study were provided independent data for testing our 
new site index curves with those of Schumacher and Coile (1960). We chose the Chumacher-Coile curves
for purposes of comparison because they are widely used in estimating growth and yield of loblolly
pin in the Southeastern Coastal Plain. When the growth plots were established in 1949, they ranged in
age from 16 to 50 years and in site index (age 50) from 63 to 119 feet. Measurements of these 74 plots
at 5-year intervals for 20-year period furnished 364 separate estimates of age and height.
\\
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Reproduced from USDA For. Ser. Res. Paper SE-115, June 1974.
Service Forester's Handbook

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