Plant-induced changes in soil nutrient dynamics by native and invasive grass species

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• 作者：Lora B. Perkins (1) lperkins@cabnr.unr.edu
  Dale W. Johnson (1)
  Robert S. Nowak (1)
• 关键词：Plant invasion – ; nutrient dynamics – ; Bromus tectorum – ; Taeniatherum caput ; medsae – ; Nitrogen budget
• 刊名：Plant and Soil
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：345
• 期：1-2
• 页码：365-374
• 全文大小：482.2 KB
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• 作者单位：1. Department of Natural Resources and Environmental Science, University of Nevada, Reno, Reno, NV 89557, USA
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

Alteration of soil nutrient dynamics has recently garnered more attention as both a cause and an effect of plant invasion. This project examines how nutrient dynamics are affected by native (Elymus elymoides, Pseudoroegneria spicata, and Vulpia microstachys) and invasive (Aegilops triuncialis, Agropyron cristatum, Bromus tectorum, and Taeniatherum caput-medusae) grass species. This research questions whether natives and invasives differ in their effects on nutrient dynamics. A greenhouse study was conducted using two field-collected soils. Effects on nutrient dynamics were compared using an integrated index that evaluates the total nutrients in soil and in plant tissue compared to an unplanted control. With this index, we evaluated whether soil nutrients increased or decreased as a result of plant growth, controlling for plant uptake. We found no consistent support for our hypothesis that invasive grass species as a group influence nutrient dynamics differently than native grass species as a group. Our results indicate species-specific effects on nutrient dynamics. Alteration of nutrient dynamics is not a trait shared by all of the invasive grass species in our study. However, alteration of nutrient dynamics may be a mechanism by which some individual species increase their invasive potential.