An Ecophysiological Approach to Quantifying Nitrogen Fixation by Lobaria oregana

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Phosphorus Fertilization Increases the Abundance and Nitrogenase Activity of the Cyanolichen Pseudocyphellaria crocata in Hawaiian Montane Forests (2007, background): “Where they are abundant, cyanolichens may contribute a significant amount of N to forests (Forman 1975, Sollins et al. 1980, Antoine 2004), but we lack a good understanding of the factors controlling cyanolichen abundance in tropical forests.”
Biological Nitrogen Fixation in Two Tropical Forests: Ecosystem-Level Patterns and Effects of Nitrogen Fertilization (2009, methodology): “Rates of and controls on BNF are not well understood for tropical forests, where mass-balance budgets for N cycles often have outputs that exceed measured inputs. In a review of tropical watershed N budgets, Bruijnzeel (1991) showed large discrepancies between measured N inputs and outputs (from 4 t”
15 The Symbiotic Phenotype of Lichen-Forming Ascomycetes and Their Endo- and Epibionts (2012, background): “provide a significant input of new N to forest ecosystems (Millbank and Kershaw 1970; Antoine 2004).”