Collaborative Research: Restricted Plasticity of Canopy Stomatal Conductance: A Conceptual Basis for Simpler Spatial Models of Forest Transpiration

合作研究:冠层气孔导度的限制可塑性:更简单的森林蒸腾空间模型的概念基础

基本信息

  • 批准号:
    0405381
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2004
  • 资助国家:
    美国
  • 起止时间:
    2004-04-01 至 2008-03-31
  • 项目状态:
    已结题

项目摘要

0405381EwersIt is clear from recent reports by the water and carbon groups associated with the United States Global Change Research Program that accurate predictions of canopy stomatal conductance in forested systems are critical for the understanding of land surface - atmosphere fluxes and how they are affected by climate and land use changes. Indeed, land use changes are producing more fragmented landscapes and these are not readily represented in current land surface models. Current forest flux models were developed under the paradigm of research in which uniform forest stands are identified, flux measurements are made in the centers of these stands, and then what is learned here is extrapolated to the entire stand and beyond. This approach is neither necessary nor justified given the spatial complexity of vegetative communities. This projectseeks to develop a conceptual model of forest transpiration that embraces the inherent spatial variability of stomatal control while retaining a tractable measure of generalizability that is the hallmark of empirical models of stomatal conductance. Our conceptual model is based on the idea that canopy stomatal conductance is regulated primarily by water potential when water fluxes are high and of significant hydrologic import. We propose that species plasticity in canopy stomatal conductance, which determines its spatial variability and challenge for quantifying, follows a linear relationship that is keyed off of an easily quantifiable reference conductance0405381EwersIt is clear from recent reports by the water and carbon groups associated with the United States Global Change Research Program that accurate predictions of canopy stomatal conductance in forested systems are critical for the understanding of land surface - atmosphere fluxes and how they are affected by climate and land use changes. Indeed, land use changes are producing more fragmented landscapes and these are not readily represented in current land surface models. Current forest flux models were developed under the paradigm of research in which uniform forest stands are identified, flux measurements are made in the centers of these stands, and then what is learned here is extrapolated to the entire stand and beyond. This approach is neither necessary nor justified given the spatial complexity of vegetative communities. This projectseeks to develop a conceptual model of forest transpiration that embraces the inherent spatial variability of stomatal control while retaining a tractable measure of generalizability that is the hallmark of empirical models of stomatal conductance. Our conceptual model is based on the idea that canopy stomatal conductance is regulated primarily by water potential when water fluxes are high and of significant hydrologic import. We propose that species plasticity in canopy stomatal conductance, which determines its spatial variability and challenge for quantifying, follows a linear relationship that is keyed off of an easily quantifiable reference conductance
0405381 Ewers从与美国全球变化研究计划有关的水和碳小组最近的报告中可以清楚地看到,森林系统中冠层气孔导度的准确预测对于了解地表-大气通量以及它们如何受到气候和土地利用变化的影响至关重要。事实上,土地利用的变化正在产生更破碎的景观,而这些景观在目前的地表模型中并不容易表示。目前的森林通量模型是在研究范式下开发的,在研究范式中,确定了均匀的林分,在这些林分的中心进行通量测量,然后将在这里学到的知识外推到整个林分及更远的地方。鉴于植物群落的空间复杂性,这种方法既没有必要,也没有道理。该项目旨在开发一个森林蒸腾的概念模型,该模型包含气孔控制的固有空间变异性,同时保留气孔导度经验模型的标志--易于处理的概括性措施。我们的概念模型是基于这样的想法,即冠层气孔导度主要是由水势调节时,水通量高,重要的水文进口。我们认为,物种的可塑性冠层气孔导度,这决定了其空间变异性和量化的挑战,遵循一个线性关系,该关系与一个容易量化的参考导度无关。从与美国全球变化研究计划有关的水和碳小组最近的报告中可以清楚地看出,准确预测森林系统中冠层气孔导度是至关重要的了解地表-大气通量及其如何受到气候和土地利用变化的影响。事实上,土地利用的变化正在产生更破碎的景观,而这些景观在目前的地表模型中并不容易表示。目前的森林通量模型是在研究范式下开发的,在研究范式中,确定了均匀的林分,在这些林分的中心进行通量测量,然后将在这里学到的知识外推到整个林分及更远的地方。鉴于植物群落的空间复杂性,这种方法既没有必要,也没有道理。该项目旨在开发一个森林蒸腾的概念模型,该模型包含气孔控制的固有空间变异性,同时保留气孔导度经验模型的标志--易于处理的概括性措施。我们的概念模型是基于这样的想法,即冠层气孔导度主要是由水势调节时,水通量高,重要的水文进口。我们认为,物种的可塑性冠层气孔导度,这决定了其空间变异性和量化的挑战,遵循线性关系,这是一个容易量化的参考电导关闭

项目成果

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Brent Ewers其他文献

Brent Ewers的其他文献

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{{ truncateString('Brent Ewers', 18)}}的其他基金

RII Track-1: Anticipating the Climate-Water Transition and Cascading Challenges to Socio-Environmental Systems in America's Headwaters
RII Track-1:预测气候-水转变以及美国源头社会环境系统面临的级联挑战
  • 批准号:
    2149105
  • 财政年份:
    2022
  • 资助金额:
    --
  • 项目类别:
    Cooperative Agreement
RII Track-1: Linking Microbial Life to Ecosystem Services Across Wyoming's Dynamic Landscape
RII Track-1:将怀俄明州动态景观中的微生物生命与生态系统服务联系起来
  • 批准号:
    1655726
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Cooperative Agreement
RESEARCH: Predicting Genotypic Variation in Growth and Yield under Abiotic Stress through Biophysical Process Modeling
研究:通过生物物理过程建模预测非生物胁迫下生长和产量的基因型变异
  • 批准号:
    1547796
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Water in a Changing West: The Wyoming Center for Environmental Hydrology and Geophysics
不断变化的西部地区的水:怀俄明州环境水文学和地球物理学中心
  • 批准号:
    1208909
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Cooperative Agreement
ETBC: Collaborative Research: Quantifying the Effects of Large-Scale Vegetation Change on Coupled Water, Carbon, and Nutrient Cycles: Beetle Kill in Western Montane Forests
ETBC:合作研究:量化大规模植被变化对耦合水、碳和养分循环的影响:西部山地森林中的甲虫死亡
  • 批准号:
    0910731
  • 财政年份:
    2009
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Effects of Wildfire Disturbance on Water Budgets of Boreal Black Spruce Forests
野火干扰对北方黑云杉林水分收支的影响
  • 批准号:
    0515957
  • 财政年份:
    2005
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant

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