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首页> 外文学位 >The development of a coupled ecosystem exchange plant hydraulic model to explore drought related plant mortality.
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The development of a coupled ecosystem exchange plant hydraulic model to explore drought related plant mortality.

机译：开发耦合生态系统交换植物水力模型以探索与干旱相关的植物死亡率。

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摘要

A goal of global climate change modeling is to predict the impact of climate change on the distribution of global vegetative cover. The primary objective of this research is to study one factor influencing the distribution of vegetative cover, that factor being plant hydraulics. To determine how plant hydraulics might impact vegetative cover, an ecosystem exchange model was coupled with a model of plant hydraulics to explore the hydraulic limitations on plant growth under varying climatic and environmental conditions. The coupled model was tested by comparing simulated transpiration from the coupled model to simulated transpiration from the uncoupled model. A sensitivity analysis was conducted due to the large number of uncertain parameters used in the plant hydraulic component of the model. Upon model validation, simulations were run to determine the impact of soil water potential on transpiration. The model was also used to explore the impact of future IPCC projections of temperature and precipitation on the survivability of two subspecies (ssp. Vaseyana and ssp. Wyomingensis) of Artemesia Tridentata, a semi-arid desert species. This was done by shifting the timing of spring snow-melt. The coupled model predicted that ssp. Wyomingensis would be more likely to survive than ssp. Vaseyana. This result was expected as ssp. Wyomingensis is found in a dryer and warmer climate than ssp. Vaseyana owing to ssp. Wyomingensis having less vulnerability to cavitation than ssp. Vaseyana.
机译：全球气候变化建模的目标是预测气候变化对全球植物覆盖率分布的影响。这项研究的主要目的是研究影响植物植被分布的一个因素，即植物水力。为了确定植物水力学如何影响植物覆盖，将生态系统交换模型与植物水力学模型相结合，以探索在不同气候和环境条件下植物生长的水力限制。通过比较耦合模型的模拟蒸腾和非耦合模型的模拟蒸腾来测试耦合模型。由于模型的工厂液压组件中使用了大量不确定参数，因此进行了灵敏度分析。在模型验证后，进行模拟以确定土壤水势对蒸腾作用的影响。该模型还用于探讨未来IPCC的温度和降水预测对半干旱荒漠物种蒿蒿（Artemesia Tridentata）的两个亚种（Vaseyana和Wyomingensis）生存能力的影响。这是通过改变春季融雪的时间来完成的。耦合模型预测该ssp。怀俄明州比小号更可能生存。 Vaseyana。预期此结果为ssp。与怀俄明州相比，怀俄明州的气候更为干燥和温暖。 Vaseyana由于ssp。怀俄明州的空化脆弱性低于小孢子。 Vaseyana。

著录项

  • 作者

    Roberts, David Edward.;

  • 作者单位

    State University of New York at Buffalo.;

  • 授予单位 State University of New York at Buffalo.;
  • 学科 Geography.;Geobiology.;Climate Change.
  • 学位 M.S.
  • 年度 2012
  • 页码 74 p.
  • 总页数 74
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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