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首页> 外文学位 >Natural history and phytogeography of the Loess Hills and ravines, Lower Mississippi Embayment (Mississippi, Louisiana).
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Natural history and phytogeography of the Loess Hills and ravines, Lower Mississippi Embayment (Mississippi, Louisiana).

机译：黄土丘陵和沟壑的自然历史和植物地理学，下密西西比河下层（路易斯安那州密西西比州）。

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摘要

Although located near the middle of the Southeastern Coastal Plain, the hardwood forests of the Loess Hills of the Lower Mississippi Embayment have never been thoroughly studied or satisfactorily described in the literature.; This dissertation is a case study of the biogeographic variation in the species composition and structure of the mature ravine hardwood forests within the southern section of the Loess Hills, from Warren County, Mississippi, south to East Baton Rouge and Vermilion Parishes, Louisiana, as affected by latitude, physiography, edaphic conditions, and disturbance. A parallel goal is, on the basis of the current biogeographic conditions and successional dynamics, to make a reconstructive assessment of the original forests. The empirical findings of the study suggest that the effects imposed on the vegetation by the combined action of the different biogeographic factors are intricately interrelated, resulting in the complex, synergistic effect.; A very strong impact on the species composition, structure, and even the biogeographic variation is caused by the anthropogenic disturbance. During the Holocene, the forests of the Loess Hills evolved in the conditions of the persistent and growing anthropogenic pressure. This trend culminated during the 19th and 20th centuries when the landscape of the Loess Hills became strongly modified the agricultural exploitation and industrial timbering. The anthropogenic disturbance appears to have influenced selectively different groups of species depending on latitude and depth of the loess mantle. It also seems to have caused an expansion of the understory and subcanopy species which may have played a lesser role in the original forests.; This study may contribute to the better understanding of the biogeographic variation and successional dynamics of the Coastal Plain forests in general and the Loess Hills forests in particular, as well as to the conservation and restoration of the latter.
机译：虽然位于密西西比河下游黄土丘陵地带东南沿海平原的中部，但从未对文献进行过充分的研究或令人满意的描述。本文以黄土丘陵南部（从密西西比州沃伦县，南部到东巴吞鲁日和朱红巴黎）受影响的成熟山沟硬木森林物种组成和结构的生物地理变化为例。受纬度，地貌，地理条件和干扰的影响。一个并行的目标是，根据当前的生物地理条件和演替动态，对原始森林进行重建性评估。研究的实证结果表明，不同生物地理因素的共同作用对植被的影响是错综复杂的相互联系，从而产生复杂的协同作用。人为干扰对物种组成，结构乃至生物地理变异都有非常强烈的影响。全新世期间，在持续不断的人为压力的条件下，黄土山丘的森林不断演变。这种趋势在19世纪和20世纪达到顶峰，当时黄土丘陵的景观被强烈地改变了农业开发和工业用材。人为干扰似乎已根据黄土幔的纬度和深度有选择地影响了不同种类的物种。似乎还引起了林下和冠层下物种的扩张，这些物种在原始森林中的作用可能较小。这项研究可能有助于更好地了解整个沿海平原森林特别是黄土丘陵森林的生物地理变异和演替动态，以及对后者的保护和恢复。

著录项

  • 作者

    Ignatov, Igor Igorevich.;

  • 作者单位

    Louisiana State University and Agricultural & Mechanical College.;

  • 授予单位 Louisiana State University and Agricultural & Mechanical College.;
  • 学科 Physical Geography.; Biology Botany.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 650 p.
  • 总页数 650
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然地理学;植物学;
  • 关键词

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