Influence of Stand Density and Species Proportion on the Productivity of Planted Forests
Mon, 12/03/2012 - 13:24
Abstract: This study examines the influence of stand density and species proportion in mixed species forest plantations through the Forest Vegetation Simulator (FVS), forest growth modeling software. It is hypothesized that a mixed-species stand will be more productive than any monoculture of the same density due to some compatibility between the two chosen species. Trees were “planted” in 5 different densities; 460, 540, 660, 860, and 1100 trees per acre. The ratios of eastern white pine (Pinus strobus) and eastern hemlock (Tsuga canadensis) were then altered using substitutive plot designs and grown for 100 years. The most productive stand was established as a mixed-species plantation with a white pine:eastern hemlock ratio of 60:40. This stand was established with 1100 trees per acre; 660 white pine and 440 eastern hemlock. This translates to 39.6 square feet per tree, or a grid size of about 6.29’x6.29’. This stand, after 100 years of simulated growth, was 1.0038 times more productive than highest producing monoculture of the same density. Although the hypothesis was accepted, the most productive mixed-species stand developed into a white pine monoculture after 100 years of simulation.
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