Fine root production of astringent phenolics |
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Authors: | Robert N Muller Paul J Kalisz James O Luken |
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Institution: | (1) Department of Forestry, University of Kentucky, 40546-0073 Lexington, KY, USA;(2) Department of Biological Sciences, Northern Kentucky University, 41076 Highland Heights, KY, USA |
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Abstract: | Summary Chemical quality of fine roots (<1 mm diameter) was determined over a gradient of species composition in the Mixed Mesophytic Forest Region. Ash-free nitrogen, calcium, and phosphorus concentrations of roots declined by 49, 41, and 72%, respectively, over a gradient of increasing soil acidity (pH 5.3 to 4.7). Lignin concentration was unrelated to either the vegetation gradient or any of the soil changes it encompassed; however, astringent phenolics increased by 275% over the same gradient. Trends in the chemical constituency of fine roots suggest that the production of phenolics in below-ground plant parts is increased on nutrient-poor sites. This response is best related to changes in species composition, especially increasing importancy of Quercus spp.This investigation (No. 88-8-36) is connected with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director |
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Keywords: | Phenolics Fine roots Stress gradient Vegetation |
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