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首页> 外文学位 >The effects of salinity and soil drying on Spartina alterniflora in a simulated tidal system.
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The effects of salinity and soil drying on Spartina alterniflora in a simulated tidal system.

机译：在潮汐系统中，盐分和土壤干燥对互花米草的影响。

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摘要

A series of studies quantifying the role of the interactive effects of salinity and soil drying on the survival, growth, nutrient uptake, and physiology of Spartina alterniflora were conducted in a climate controlled greenhouse. The experiments consisted of multiple levels of salinity (3-5 ppt, L; 15-20 ppt, M; and 35-38 ppt, H) as well as several dynamic water levels: drought (water level maintained at 20 cm below the soil surface at high tide, D), intermediate soil drying (water level maintained between 20 cm below the soil surface at low tide and 10 cm below the soil surface at high tide, I), and flooding (water level maintained 3-5 cm above the soil surface at high tide and 10 cm below the soil surface at low tide, F). Plant survival, gas exchange, growth responses, and nutrient uptake were measured along with soil conditions of redox potential and water potential. Contrary to expectations, the interactive effects of salinity and soil drying were not strictly additive on plant survival, growth, and physiology. Significant decreases were noted in plant gas exchange and growth in response to increases in salinity and soil drying. In addition, significant decreases were seen in all nutrients in response to increases in salinity and/or soil drying. Survival was 100% for all flooded treatments while increased salinity combined with soil drying decreased survival in medium salt/drought plants (MD) and high salt/intermediate soil drying (HI) treatments. The lowest survival rate was seen in the high salt/drought treatment (HD) at 29%. Therefore, it appears that drought may magnify the adverse effects of salinity on plant function. Consequently, these studies demonstrate that combined effects of high salinity and drought proved to be detrimental to S. alterniflora. It also appears that the critical time for recovery from the combined effects of increased salinity and soil drying may greatly diminish after two weeks from the onset of stress conditions. Therefore, if salinity continues to increase along the Mississippi River Deltaic Plain, marshes dominated by S. alterniflora may be more susceptible to short-term drought and likewise large-scale marsh browning.
机译：在气候控制的温室中进行了一系列研究，这些研究量化了盐分和土壤干燥的交互作用对互花米草的存活，生长，养分吸收和生理的作用。实验包括多个盐度水平（L 3-5 ppt； M 15-20 ppt； H 35-38 ppt）和几个动态水位：干旱（水位保持在土壤下方20 cm高潮D），中等土壤干燥（低潮时水位保持在土壤表层以下20厘米，高潮时水位保持在土壤表层以下10厘米）和洪水（水位保持在3-5厘米以上）之间高潮时土壤表面，低潮时土壤表面以下10厘米，F）。测量了植物的存活，气体交换，生长反应和养分吸收以及氧化还原电位和水电位的土壤条件。与预期相反，盐分和土壤干燥的相互作用对植物的存活，生长和生理没有严格的加和作用。注意到随着盐分和土壤干燥的增加，植物气体交换和生长显着减少。此外，随着盐分和/或土壤干燥的增加，所有养分均明显减少。所有淹水处理的存活率均为100％，而盐分增加和土壤干燥会降低中盐/干旱植物（MD）和高盐/中层土壤干燥（HI）处理的存活率。在高盐/干旱处理（HD）中，存活率最低，为29％。因此，干旱似乎加剧了盐度对植物功能的不利影响。因此，这些研究表明高盐度和干旱的综合影响被证明对互花米链球菌有害。似乎从盐度增加和土壤干燥的综合作用中恢复的关键时间也可能在应激条件发生两周后大大减少。因此，如果沿密西西比河三角洲平原的盐度持续增加，则以互花米草为主的沼泽可能更容易遭受短期干旱和大规模沼泽褐变的影响。

著录项

  • 作者

    Brown, Christopher E.;

  • 作者单位

    The University of Memphis.;

  • 授予单位 The University of Memphis.;
  • 学科 Biology Plant Physiology.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 152 p.
  • 总页数 152
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物学;
  • 关键词

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