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Pine Straw Harvesting, Fire, and Fertilization Affect Understory Vegetation within a Louisiana Longleaf Pine Stand

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Pine straw harvesting can provide an economic benefit to landowners, but the practice may also change the composition of plant communities. This research was initiated in a 34-year-old stand of longleaf pine (Pinus palustris Mill.) established in 1956 to study how pine straw management practices (fertilization, prescribed fire, and straw harvesting) affected plant communities, and herein, effects on understory vegetation are reported. A randomized complete block split-plot design was installed with two main plots: (1) no fertilization and (2) fertilization three times with different combinations of N, P, and K. There were four subplot treatments: (1) control, (2) prescribed fire, (3) prescribed fire and 2 harvests of pine straw, and (4) 13 annual harvests of pine straw. Fertilization significantly increased grass cover as a percentage of surface area. However, there was a general lack of understory plant response to nutrient amendments, partly because pine straw harvesting and burning were confounding fertilization effects. Prescribed fire and mechanical harvesting activities created similar understories on subplot treatments 2, 3, and 4 by significantly reducing understory woody plant stature and removing litter. Increases in understory tree and shrub stature, number of woody vines per acre, and percentage of woody plant cover significantly decreased herbaceous plant yields and percentage of cover.
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Keywords: Pinus palustris Mill; diammonium phosphate; potash; triple superphosphate; understory plant community

Document Type: Research Article

Publication date: 2012-08-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Southern Journal of Applied Forestry covers an area from Virginia and Kentucky south to as far west as Oklahoma and east Texas.
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