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GIS-Based Modeling of Pinyon-Juniper Woodland Structure in the Great Basin

机译:基于GIS的大盆地Pinyon-Juniper林地结构建模。

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摘要

Pinyon-juniper woodlands are a dominant vegetation type across the Intermountain West, covering an estimated 30 million ha. Increases in density, cover, and aerial extent over recent decades have been associated with altered fire regimes, tree mortality, and reduced understory productivity. In our study we sought to determine how environmental factors influence woodland structure and to exploit such abiotic influences to improve our ability to model woodland structure from digital aerial photography. We developed and applied a methodology for automated tree canopy cover mapping using an object-oriented classifier. The resulting classification was used to scale up stand inventory measurements (0.1 ha) across 11 mountain ranges to a 3,250 km^sup 2^ area. Predictive models were compared with field-measured values from a validation sample for tree canopy cover, basal area, height, and stand density index. Linear mixed-effects regression models demonstrated consistent relationships between woodland structure attributes and environmental variables. More productive sites supported greater tree densities, whereas less productive sites supported fewer, larger trees. Relatively weak relationships for certain variables (e.g., tree height) suggest that woodland structure-environment relationships are partially obscured by natural disturbances and land use history. [PUBLICATION ABSTRACT]
机译:Pinyon-Juniper林地是整个Intermountain West地区的主要植被类型,估计覆盖3000万公顷。近几十年来,密度,覆盖率和空中范围的增加与火势的改变,树木的死亡率以及林下生产力的下降有关。在我们的研究中,我们试图确定环境因素如何影响林地结构,并利用这种非生物因素来提高我们通过数字航空摄影对林地结构建模的能力。我们使用面向对象的分类器开发并应用了用于自动树冠覆盖图映射的方法。所得到的分类用于将11个山脉的林分存量测量(0.1公顷)扩大到3,250 km ^ sup 2 ^的面积。将预测模型与来自验证样本的实地测量值进行比较,以得出树冠覆盖率,基础面积,高度和林分密度指数。线性混合效应回归模型表明林地结构属性与环境变量之间具有一致的关系。高产站点支持更高的树木密度,而低产站点支持更少,更大的树木。某些变量(例如树高)的相对较弱的关系表明,林地结构与环境之间的关系部分被自然干扰和土地使用历史所掩盖。 [出版物摘要]

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  • 来源
    《Forest Science》 |2009年第1期|p.1-12|共12页
  • 作者单位

    David Greenwood, Department of Natural Resources and Environmental Science, University of Nevada, Reno, NV - dlgreenwood4@yahoo.com. Peter Weisberg, University of Nevada, Department of Natural Resources and Environmental Science, 1000 Valley Road, Mail Stop 186, Reno, NV 89557 - Phone: (775) 784-7573, pweisberg@cabnr.unr.edu.Acknowledgments: The US Bureau of Land Management (Battle Mountain Field Station) provided funding through the Great Basin Cooperative Ecosystem Studies Unit (Cooperative Agreement FAA010017). We thank J. Ratliff for inspiration, ideas, and logistical support and J. Propp and L. Potvin for assistance with field data collection.Manuscript received April 8, 2007, accepted August 19, 2008 Copyright © 2009 by the Society of American Foresters,;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 13:45:59

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