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Biology and Fertility of Soils

, Volume 42, Issue 3, pp 215–223 | Cite as

The major features of an infestation by the invasive weed legume gorse (Ulex europaeus) on volcanic soils in Hawaii

  • J. K. Leary
  • N. V. Hue
  • P. W. Singleton
  • D. BorthakurEmail author
Original Paper

Abstract

Gorse (Ulex europaeus) infestation occupies over 4,000 ha of agriculture and conservation lands on the southeastern slope of Mauna Kea on the Island of Hawaii. The aim of this investigation is to identify ecological features associated with this weed invasion by comparing the gorse-infested areas to the surrounding uninfested areas of this landscape. The soils within the gorse infestation are more acidic, resulting in higher levels of KCl-extractable Al and lower levels of Mehlich III-extractable Ca, Mg, Mn, and Zn. Yet, gorse accumulates higher concentrations of Ca, Zn and, Cu than the kikuyu grass (Pennesitum clandestinum), which is ubiquitous throughout the site. The Ca:Al and Mg:Al molar charge ratios of the soils are lowest within the epicenter of the gorse infestation, while the molar ratios are highest in the gorse apical stem tissues. All gorse plants are nodulated and have higher nitrogen contents than the surrounding kikuyu grass. Furthermore, the δ15N of the gorse stem tissues approaches 0‰, suggesting that nitrogen is being symbiotically fixed from the atmosphere. Characterization of the Bradyrhizobium isolated from gorse nodules shows similarities and distinctions to Bradyrhizobium isolated from the endemic legume koa (Acacia koa) within the same location. Population densities of the indigenous Bradyrhizobium are higher within the gorse rhizosphere than the kikuyu grass. Soil acidification, nutrient depletion, and symbiotic nitrogen fixation distinguish gorse-infested areas from the surrounding uninfested areas. These observations suggest that gorse has a competitive advantage over kikuyu grass under conditions of soil nutrient deficiency.

Keywords

Ulex europaeus Pennesitum clandestinum Acacia koa Bradyrhizobium Invasive weed 

Notes

Acknowledgements

This research was supported by USDA-TSTAR grant award 2004-34135-15174. The authors wish to thank Nick Dudley of the Hawaii Agriculture Research Center, Mike Robinson of the Hawaii State Department of Hawaiian Home Lands, and Dick Wass of the U.S. Fish and Wildlife Service for logistical support and also to Halina Zalenski and Tomoaki Miura for technical advice in presentation.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • J. K. Leary
    • 1
  • N. V. Hue
    • 2
  • P. W. Singleton
    • 2
  • D. Borthakur
    • 1
    Email author
  1. 1.Department of Molecular Biosciences and BioengineeringUniversity of Hawaii at ManoaHonoluluUSA
  2. 2.Department of Tropical Plant and Soil SciencesUniversity of Hawaii at ManoaHonoluluUSA

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