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MacKenzie, Richard A.; Wiegner, Tracy N.; Kinslow, Frances; Cormier, Nicole; Strauch, Ayron M.

Leaf-litter inputs from an invasive nitrogen-fixing tree influence organic-matter dynamics and nitrogen inputs in a Hawaiian river

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  • Medientyp: E-Artikel
  • Titel: Leaf-litter inputs from an invasive nitrogen-fixing tree influence organic-matter dynamics and nitrogen inputs in a Hawaiian river
  • Beteiligte: MacKenzie, Richard A.; Wiegner, Tracy N.; Kinslow, Frances; Cormier, Nicole; Strauch, Ayron M.
  • Erschienen: The University of Chicago Press, 2013
  • Erschienen in: Freshwater Science, 32 (2013) 3, Seite 1036-1052
  • Sprache: Englisch
  • DOI: 10.1899/12-152.1
  • ISSN: 2161-9549; 2161-9565
  • Entstehung:
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  • Beschreibung: Abstract We examined how invasion of tropical riparian forests by an exotic N-fixing tree (Falcataria moluccana) affects organic-matter dynamics in a Hawaiian river by comparing early stages of leaf-litter breakdown between the exoticF. moluccanaand nativeMetrosideros polymorphatrees. We examined early decomposition stages because of low leaf-litter retention rates (<20 d) that result from the flashy nature of tropical Pacific Island streams. Leaf breakdown rates, fungal biomass, and invertebrate abundances were 40, 120, and 30% greater, respectively, forF. moluccanathanM. polymorphaleaves. Leaf-litter breakdown was largely a result of stream flow and to a lesser extent fungal colonization. Invertebrates were not an important factor in leaf-litter breakdown. Initial tannin content, leaf C∶N, and toughness were important intrinsic factors inhibiting leaf breakdown and fungal colonization. Regression analyses between remaining N content (%) and ash-free dry mass of leaf litter revealed that the early stages ofF. moluccanaleaf-litter breakdown are a source of N to streams invaded byF. moluccanaand contribute a conservatively estimated 2.1 to 5.7% to the available total dissolved N pool. Direct input ofF. moluccanaleaf litter influences early stages of leaf-litter breakdown in tropical streams with low leaf-litter retention rates. Direct input of leaf litter also contributes somewhat to N inputs, but subsurface flows through N-rich soils ofF. moluccana-invaded riparian forests probably are a greater source.