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Growth of Pteris Vittata as a Function of Light Levels, Nutrients, and Soil PH.

Growth of Pteris Vittata as a Function of Light Levels, Nutrients, and Soil PH.


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Pteris vittata, also known as the Chinese brake fern or the ladder brake fern, is a plant that naturally occurs in Asia and has been introduced into parts of the United States. Pteris vittata has the ability to hyperaccumulate arsenic. Research indicates that when the plant is grown in pot experiments with added arsenic, over 2.3% of the plants biomass could potentially be composed of arsenic. This plant could potentially be used for phytoremediation of arsenic, or possibly other metal contaminated soils. Phytoremediation is the biological removal of trace metals from the soil through the use of plants. There has been much research on how P. vittata hyperaccumulates arsenic from soil, but few studies have been done to show P. vittata's light, nutrient, and soil pH requirements. Experiments were carried out at various light levels, nutrient levels, and soil pH levels to delineate the best conditions required for growth of Pteris vittata, and to better evaluate where it could be used in phytoremediation. In the first experiment P. vittata plants were grown in four light treatments; full greenhouse light (100%), 75% light, 50% light and 25% light. For aboveground dry mass, greatest dry mass was in the 75% light treatment. There was no significant difference between the 75% treatment and full light treatment, but it was significantly different from all the others. For belowground dry mass, greatest dry mass was in the full light treatment. There was no significant difference between the 75% treatment and full light treatment, but it was significantly different from all the others. For total dry mass, greatest dry mass was in the full light treatment. There was no significant difference between the 75% treatment and full light treatment, but it was significantly different from all the others. In the second experiment, P. vittata plants were grown in sand at four nutrient levels; 200%, 100%, 50%, and no added nutrients (0%). For aboveground dry mass, greatest dry mass was in the 100% nutrient treatment. There was no significant difference between the 200%, 100% and 50% nutrient treatments, but they were significantly higher from the no added (0%) nutrient treatment. For belowground dry mass, greatest dry mass was in the 100% nutrient treatment. There was no significant difference between the 200%, 100%, 50%, and no added nutrients (0%) treatments. For total dry mass, greatest dry mass was in the 100% nutrient treatment. There was no significant difference between the 200%, 100%, 50%, and no added (0%) nutrient treatment. In the third experiment, P. vittata plants were grown at three different pH levels; 6, 7, and 9. For aboveground dry mass, below ground dry mass, and total dry mass the greatest dry mass was in the pH 9 treatment. There was no significant difference between pH treatments for aboveground, belowground, and total dry mass. Pteris vittata appears to be a candidate for use in phytoremediation. The plant seems to have a broad niche, capable of growing various light levels, at various nutrient levels, and it appears to tolerate a wide range of soil pH levels. When grown in the correct conditions, high biomass can be achieved for possible bioremediation.


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Product Details
  • ISBN-13: 9781243018366
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 254 mm
  • Weight: 222 gr
  • ISBN-10: 1243018364
  • Publisher Date: 29 Aug 2011
  • Binding: Paperback
  • Spine Width: 5 mm
  • Width: 203 mm


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