Distribution and ratios of Cs and K in control and K-treated coconut trees at Bikini Island where nuclear test fallout occurred: effects and implications |
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Authors: | William L Robison Patrick H Brown Earl L Stone Terry F Hamilton Cynthia L Conrado Steven Kehl |
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Institution: | 1. Lawrence Livermore National Laboratory, 7000 East Avenue, L-642, Livermore, CA 94550-9234, USA;2. University of California, Department of Plant Sciences, Davis, CA 95819, USA;3. University of Florida, USA |
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Abstract: | Coconut trees growing on atolls of the Bikini Islands are on the margin of K deficiency because the concentration of exchangeable K in coral soil is very low, ranging from only 20 to 80 mg kg−1. When provided with additional K, coconut trees absorb large quantities of K and this uptake of K significantly alters the patterns of distribution of 137Cs within the plant. Following a single K fertilization event, mean total K in trunks of K-treated trees is 5.6 times greater than in trunks of control trees. In contrast, 137Cs concentration in trunks of K-treated and control trees is statistically the same while 137Cs is significantly lower in edible fruits of K-treated trees. Within one year after fertilization (one rainy season), K concentration in soil is back to naturally low concentrations. However, the tissue concentrations of K in treated trees stays very high internally in the trees for years while 137Cs concentration in treated trees remains very low in all tree compartments except for the trunk. Potassium fertilization did not change soil Cs availability. |
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Keywords: | Trees Potassium transport 137Cs transport Uptake Compartment-distribution Internal K control K channel K transporters |
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