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Ditch plant response to variable flooding: A case study of Leersia oryzoides (rice cutgrass)

Samuel C. Pierce, S. Reza Pezeshki and Matt T. Moore
Journal of Soil and Water Conservation July 2007, 62 (4) 216-225;
Samuel C. Pierce
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S. Reza Pezeshki
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Matt T. Moore
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Abstract:

Vegetated drainages are an effective method for removal of pollutants associated with agricultural runoff. Leersia oryzoides (rice cutgrass), a plant common to agricultural ditches, may be particularly effective in the remediation process; however, responses of L. oryzoides to flooding are undocumented. The objective of this greenhouse study was to characterize responses of L. oryzoides to various soil moisture regimes representative of agricultural ditches, including four treatments ranging from well drained to saturated. Over the eight weeks of the study, plants were subjected to four flooding regimes that included a (1) well-watered, well-drained control; (2) well-watered, well-drained intermittently flooded treatment; (3) partially flooded treatment; and (4) continuously flooded treatment. Decreases in photosynthesis occurred only when soil redox potential (Eh) dropped below +350 mV (all flooded treatments). Although flooding reduced belowground:aboveground bio-mass ratios, overall productivity and root development were unaffected. Results indicated that management practices increasing retention time in agricultural ditches would not reduce productivity in L. oryzoides until soil oxygen is depleted for sufficient duration to induce reduction.

Footnotes

  • Samuel C. Pierce is a PhD candidate and S. Reza Pezeshki is a professor in the Department of Biology at the University of Memphis, Memphis, Tennessee. Matt T. Moore is a research ecologist at the National Sedimentation Laboratory, USDA Agricultural Research Service, Oxford, Mississippi.

  • Copyright 2007 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 62 (4)
Journal of Soil and Water Conservation
Vol. 62, Issue 4
July/August 2007
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Ditch plant response to variable flooding: A case study of Leersia oryzoides (rice cutgrass)
Samuel C. Pierce, S. Reza Pezeshki, Matt T. Moore
Journal of Soil and Water Conservation Jul 2007, 62 (4) 216-225;

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Ditch plant response to variable flooding: A case study of Leersia oryzoides (rice cutgrass)
Samuel C. Pierce, S. Reza Pezeshki, Matt T. Moore
Journal of Soil and Water Conservation Jul 2007, 62 (4) 216-225;
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