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首页> 外文学位 >Assessing quaking Aspen (Populus tremuloides) decline on Cedar Mountain in Southern Utah using remote sensing and geographic information systems.
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Assessing quaking Aspen (Populus tremuloides) decline on Cedar Mountain in Southern Utah using remote sensing and geographic information systems.

机译：使用遥感和地理信息系统评估犹他州南部雪松山的地震白杨（Populus tremuloides）下降。

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摘要

Quaking aspen (Populus tremuloides Michx.) is the most widespread deciduous tree species in North America and aspen ecosystems are highly valued for multiple use, being noted for forage production, understory diversity, wildlife habitat, timber, hydrological assets, and aesthetics. However, aspen communities in the Intermountain Region of the western United States are in evident decline, with certain areas experiencing rapid mortality over the past decade. One location of special interest is the quaking aspen on Cedar Mountain in Southern Utah, USA, an isolated population in the southwestern portion of aspen's geographic range.Lacking critical information on the location, extent, and magnitude of declining stands, land managers could utilize detailed spatial information to manage aspen on Cedar Mountain. To inform land managers of Cedar Mountain and develop methodologies applicable for aspen landscapes across the Intermountain West, a spatially explicit aspen stand type classification using multi-spectral imagery, digital elevation models, and ancillary data was produced for the 27,216-ha pilot study area. In addition, a statistical analysis was performed to assess the relationships between landscape parameters derived from the geospatial information (i.e. slope, aspect, elevation) and aspen on the Cedar Mountain landscape.A supervised classification composed of three aspen stand types (1-healthy, 2-damaged, 3-seral) was produced using Classification and Regression Tree (CART) analysis and validated using National Agriculture Imagery Program (NAIP) imagery. Within Cedar Mountain aspen cover, classification estimates were 49%, 35%, and 16% for healthy, damaged, and seral aspen stand types, respectively. Validation measures yielded an overall accuracy measure of 81.3%, (KHAT=.69, n = 446).Important landscape metrics for the three health classes were found to be significantly different. Damaged stands were found primarily at lower elevations on south-to-west (drier) aspects. Within the aspen elevation range, the mean elevation of damaged stands (2,708 m) was significantly lower than that of the mean elevation of healthy stands (2,754 m). Aspect (moisture index) was also significantly different, with damaged stands primarily on southerly (drier) aspects and healthy stands generally on northerly (wetter) aspects. Slope, however, was not found to be significantly different among aspen types.
机译：枯萎的白杨（Populus tremuloides Michx。）是北美最广泛的落叶乔木树种，白杨生态系统具有很高的价值，具有多种用途，在牧草生产，林下多样性，野生动植物栖息地，木材，水文资产和美学上广为人知。但是，美国西部山间地区的白杨群落明显减少，在过去十年中某些地区的死亡率迅速上升。特别令人感兴趣的地点是美国犹他州南部雪松山上的地震白杨，这是白杨地理范围西南部的一个孤立人群。由于缺乏有关下降林地的位置，范围和大小的重要信息，土地管理人员可以利用详细的信息空间信息来管理雪松山上的白杨。为了向Cedar Mountain的土地管理人员提供信息并开发适用于整个Intermountain West的白杨景观的方法，使用了多光谱图像，数字高程模型和辅助数据，为27,216公顷的试验研究区域提供了空间明确的白杨林类型分类。此外，还进行了统计分析，以评估从地理空间信息（即坡度，高程，高程）和雪松山景观中的白杨获得的景观参数之间的关系。监督分类包括三种白杨林类型（1-健康，使用分类和回归树（CART）分析生成了2损坏，3评分），并使用了国家农业影像计划（NAIP）影像进行了验证。在Cedar Mountain的白杨林覆盖范围内，健康，受损和串行白杨林分类型的分类估计分别为49％，35％和16％。验证量度得出的总体准确性量度为81.3％（KHAT = .69，n = 446）。发现三种健康等级的重要景观量度显着不同。受损林分主要在西南（干燥）地区的较低海拔上发现。在白杨海拔范围内，受损林分的平均海拔（2,708 m）明显低于健康林分的平均海拔（2,754 m）。纵横比（湿度指数）也有显着差异，受损林分主要在偏南（干燥）方面，而健康林分通常在偏北（较湿）方面。然而，在白杨类型之间没有发现坡度有显着差异。

著录项

  • 作者

    Oukrop, Chad M.;

  • 作者单位

    Utah State University.;

  • 授予单位 Utah State University.;
  • 学科 Biology Ecology.
  • 学位 M.S.
  • 年度 2010
  • 页码 140 p.
  • 总页数 140
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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