Phosphorus Fertilization Increases the Abundance and Nitrogenase Activity of the Cyanolichen Pseudocyphellaria crocata in Hawaiian Montane Forests

By J. Benner, S. Conroy, C. Lunch, Noriko Toyoda, P. Vitousek. 2007

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The Nitrogen Paradox in Tropical Forest Ecosystems (2009, background): “Fixation by canopy N fixers—epiphytic cyanolichens, cyanobacteria in bryophytes, and freeliving bacteria on epiphylls—can also contribute significant external N inputs to tropical forests (up to ∼5 kg ha−1 year−1; Benner et al. 2007, Freiberg 1998, Matzek & Vitousek 2003, Reed et al. 2008).”
Relationships among phosphorus, molybdenum and free-living nitrogen fixation in tropical rain forests: results from observational and experimental analyses (2013, background): “…experimental work suggests the importance of phosphorus (P) and/or molybdenum (Mo) availability in regulating the process (Eisele et al. 1989; Silvester 1989; Pearson and Vitousek 2002; Hungate and 2004; Reed et al. 2007a, b; Benner et al. 2007; Barron et al. 2009; Wurzburger et al. 2012).”
Epiphyte diversity and biomass loads of canopy emergent trees in Chilean temperate rain forests: A neglected functional component (2010, background): “Preliminary assays in Pseudocyphellaria, a well-known, N-fixing lichen in the upper branches of coastal rainforest trees, showed high nitrogenase activity (Galloway, 1996; Benner et al., 2007; Dı́az, 2009).”