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The role of biocrusts in coastal dune plant communities

机译：生物结皮在沿海沙丘植物群落中的作用

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摘要

Biocrusts have been shown to affect the ecological conditions in a variety of habitats, involving abiotic mechanisms such as soil moisture retention, nitrogen-rich biomass additions, changing soil physical properties, as well as direct biotic mechanisms such as impeding seedling growth. In coastal dunes, low-lying interdune habitats experience occasional flooding, which promotes the formation of microbial biocrusts. While storm patterns are known to be effective drivers of coastal dune plant community composition, the interaction between microbial communities and vegetation in the context of storm patterns is not well understood. I investigated the role of biocrusts on native coastal dune community, how environmental conditions, particularly storm patterns, affect interactions between crusts and vegetation, as well as how the presence of crusts affects plant-plant interactions.;To explore correlative patterns between biocrusts, plants and abiotic factors in the field, I analyzed a long term dataset of a coastal dune plant community on St George Island, FL. The presence of several plant species was correlated with crust, and included both negative and positive associations. Additionally, I found correlative relationships with crusts and total plant cover, as well as soil moisture; the latter supports previous research in other systems on the effects of crusts on soil characteristics.;To test the effect of crusts on plant species, I conducted a greenhouse experiment that simulated various environmental conditions, including several water and salt treatments, with and without biocrust in a factorial design. Crusts did have an effect on the growth and survival of some of these species, and this effect varied from negative to positive depending on the species. Additionally, I found trends in the data which suggest that crusts may interact with rain and salt, and this interaction may change the effect of crust on plant species in various environmental conditions.;Lastly, I performed a target-neighbor competition experiment using four dominant coastal dune plant species in a full factorial design to test the effect of crusts on plant-plant interactions. I found that the selected species often strongly compete, and these competition interactions vary among species. I also found a significant effect of crust on one species, Schizachyrium maritimum.
机译：研究表明，生物结皮会影响多种生境的生态条件，涉及非生物机制，例如土壤水分保持，富含氮的生物量添加，改变土壤物​​理特性，以及直接生物机制，例如阻碍幼苗生长。在沿海沙丘中，地势低洼的栖息地偶尔会遭受洪水泛滥，从而促进了微生物生物结皮的形成。虽然已知风暴模式是沿海沙丘植物群落组成的有效驱动因素，但人们对风暴模式中微生物群落与植被之间的相互作用还知之甚少。我研究了生物结皮在沿海沿海沙丘群落中的作用，环境条件（特别是暴风模式）如何影响结皮与植被之间的相互作用以及结皮的存在如何影响植物与植物的相互作用。探讨生物结皮与植物之间的相关模式和非生物因素，我分析了佛罗里达州圣乔治岛沿海沙丘植物群落的长期数据。几种植物的存在与地壳相关，包括负向和正向联系。另外，我发现与地壳，植物总覆盖率以及土壤水分之间存在相关关系。后者支持了以前在其他系统中研究结皮对土壤特性的影响。为了测试结皮对植物物种的影响，我进行了温室实验，模拟了各种环境条件，包括有无生物结皮的几种水和盐处理方法在析因设计中。结壳确实对其中一些物种的生长和存活产生了影响，并且根据物种的不同，这种影响从负到正不等。此外，我发现了数据趋势，表明结壳可能与雨水和盐分相互作用，并且这种相互作用可能会改变结壳在各种环境条件下的影响。最后，我使用四个优势进行了目标-邻居竞争实验采用全因子设计来研究沿海沙丘植物物种，以测试地壳对植物与植物相互作用的影响。我发现选定的物种通常会激烈竞争，并且这些竞争相互作用在物种之间有所不同。我还发现地壳对一种物种海藻Schizachyrium maritimum有显着影响。

著录项

  • 作者

    Lauck, Marina.;

  • 作者单位

    The Florida State University.;

  • 授予单位 The Florida State University.;
  • 学科 Ecology.
  • 学位 M.S.
  • 年度 2016
  • 页码 72 p.
  • 总页数 72
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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