Elevated, but highly variable, acetylene reduction in soils associated with the invasive shrub Rhamnus cathartica in a Midwestern oak forest

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• 作者：Patrick M. Ewing ; Domokos Lauko ; Mike Anderson
• 关键词：Rhamnus cathartica ; Acetylene reduction assay ; Frankia ; Nitrogen fixation ; Invasive species ; Invasion mechanism
• 刊名：Biological Invasions
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：17
• 期：8
• 页码：2229-2234
• 全文大小：346 KB
• 参考文献：Anderson MD, Ruess RW, Uliassi DD, Mitchell JS (2004) Estimating N2 fixation in two species of Alnus in interior Alaska using acetylene reduction and 15N2 uptake. Ecoscience 11:102-12
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• 作者单位：Patrick M. Ewing (1)
  Domokos Lauko (2)
  Mike Anderson (3)
  
  1. Department of Agronomy and Plant Genetics, University of Minnesota, 1991 Upper Buford Circle, Saint Paul, MN, 55108, USA
  2. Department of Plant and Microbial Biology, University of California, Berkeley, 111 Koshland Hall, Berkeley, CA, 94720, USA
  3. Biology Department, Macalester College, 1600 Grand Avenue, Saint Paul, MN, 55105, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Ecology
  Hydrobiology
  Zoology
  Forestry
  
• 出版者：Springer Netherlands
• ISSN：1573-1464

文摘

Common buckthorn (Rhamnus cathartica) is an important invasive shrub in North American forests, where it is thought that the plant’s retention of green leaves during autumn canopy senescence helps it succeed in deciduous understory habitat. This trait results in loss of nitrogen (N) in N-rich leaf litter, which has led some workers to suggest buckthorn may foster associative N-fixation in soil. We examined this possibility in an oak woodland understory in eastern Minnesota using the acetylene reduction assay to compare apparent nitrogenase activity in soils collected from beneath buckthorn individuals with soils collected from a canopy species (Quercus spp.), an important understory shrub (Prunus serotina), and non-vegetated areas. Buckthorn and non-buckthorn soils differed in variability of acetylene reduction (AR) rates, with buckthorn values covering a range 10× the range of non-buckthorn soils. Mean AR also differed between buckthorn and non-buckthorn soils, but the direction and magnitude of the difference varied with sampling location. Estimates of N inputs calculated from our data suggest that AR values at the high end of the buckthorn-associated range are biologically significant. Our results represent the first measurement of AR activity associated with common buckthorn, and are consistent with the hypothesis that this plant supports associative N fixation under some conditions. Suggestions for follow-up studies are provided.