NUTRIENT AND GROWTH RESPONSES OF LEERSIA ORYZOIDES,RICE CUTGRASS,TO VARYING DEGREES OF SOIL SATURATION AND WATER NITROGEN CONCENTRATION |
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| Authors: | Melissa B Koontz Joshua M Koontz S R Pezeshki Matthew Moore |
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| Institution: | 1. Biological Sciences , The University of Memphis , Memphis , Tennessee , USA;2. U.S. Army Corps of Engineers, Environmental Division , Memphis , Tennessee , USA;3. USDA-ARS, National Sedimentation Laboratory, Water Quality and Ecology Research Unit , Oxford , Mississippi , USA |
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| Abstract: | Leersia oryzoides (rice cutgrass) is an obligate wetland plant common to agricultural drainage ditches. The objective of this greenhouse study was to expose plants to various flooding and aqueous nitrogen (N) concentrations and then to quantify the allocation of nutrients and biomass to plant components. Plants in the continuously flooded treatment (CF) had the highest tissue concentrations of copper (Cu), sulfur (S), zinc (Zn), potassium (K), sodium (Na), and manganese (Mn) in one or more plant components. Plants in the partially flooded treatment (PF) had the highest concentrations of magnesium (Mg) in leaves. The N input affected phosphorus (P) and S concentrations in roots. Leaf, stem, and root biomass were highest in PF plants. Rhizome biomass was the lowest in CF plants. These results indicate that L. oryzoides may significantly affect elemental concentrations in surface waters by its ability to uptake various elements and subsequent sequestration in various biomass components. |
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| Keywords: | agricultural runoff elemental concentrations drainage ditch N pollution variable flooding wetland plants vegetated buffer buffer strip |
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