Abstract
The Everglades is a low-nutrient ecosystem occupied by marsh plant species adapted to low availability of phosphorus. Recently, however, tree islands that are scattered throughout the marsh have been recognized as biogeochemical hotspots. The goal of this study was to determine the general patterns of response by common tree species when conditions limiting to optimal growth were improved by fertilization in an experimentally constructed and managed Everglades wetland. Thirty-six trees of two species, Annona glabra and Chrysobalanus icaco, were randomly selected on two peat- and two limestone-based islands. Each tree was treated with one of three nutrient regimes: Nitrogen (N), Phosphorus (P), or Control (no addition of nutrients). Positive highly significant P-treatment effects on leaf total P and leaf N:P were observed in both species in comparison to Control trees, but neither species exhibited a similar response to N-fertilization. However, among the two species, only A. glabra responded to P-fertilization with increased growth. Both fertilized and unfertilized trees of each species exhibited a highly significant growth response to hydrological condition, with growth enhanced on less persistently flooded sites. Our experimental results identify a clear difference in species growth responses to substrate type in the two species, but do not support the idea that a single critical N:P ratio can be used to indicate nutrient limitation for all wetland trees.
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Acknowledgments
We would like to thank to Jay Sah, Pablo Ruiz, Steve Oberbauer, Eric Cline, Sharon Ewe, Jim Fourquerean, and Leo Sternberg for providing us with much constructive advice during experimental design and data interpretation, and other individuals who assisted in the field and/or laboratory: Nate Colbert, Lawrence Lopez, Diana Johnson, Carey Rebenack, Robert Schroeder, Susana Stoffella, Eric Cline, Michael Kline, Diana Rodriguez, and Danielle Ogurcak. This study was supported by a grant from the Everglades Division, South Florida Water Management District. Many thanks to the South Florida water management District for Research Assistantship under LILA project. We would like to thank Dr. Scinto’s and Dr. Anderson’s labs at FIU provided us with all manner of laboratory instruments, and the instruction to use them. This paper is contribution # 571 of the Southeast Environmental Research Center (SERC).
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Subedi, S.C., Ross, M.S. & Scinto, L.J. Nutrient Limitation in Two Everglades Tree Species Planted on Constructed Tree Islands. Wetlands 32, 1163–1173 (2012). https://doi.org/10.1007/s13157-012-0346-0
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DOI: https://doi.org/10.1007/s13157-012-0346-0