Effects of nutrient amendments on fine root biomass in a primary successional forest in Hawai'i |
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Authors: | Stith T Gower Peter M Vitousek |
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Institution: | (1) Environmental Sciences Division, Oak Ridge National Laboratory, 37831-6034 Oak Ridge, TN, USA |
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Abstract: | Summary Thalli of Lobaria pulmonaria (L.) Hoffm., a nitrogen-fixing epiphyte common in mesic temperate forests, were collected in a Douglas-fir (Pseudotsuga menziesii Franco) forest near Corvallis, Oregon, and maintained for 20 to 40 days in controlled-environment chambers with atmospheric CO2 concentrations of 374 and 700 ll-1. Nitrogenase activity, which was assayed by the acetylene reduction method, was approximately doubled in the lichen maintained in elevated CO2. Increases in nitrogen fixation by lichens may be an important part of the integrated ecosystem response to rising CO2. |
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Keywords: | Carbon dioxide Lichen Lobaria Nitrogen fixation |
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