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首页> 外文学位 >Land use and disturbance interactions in dynamic arid systems: Multiscale remote sensing approaches for monitoring and analyzing riparian vegetation change.
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Land use and disturbance interactions in dynamic arid systems: Multiscale remote sensing approaches for monitoring and analyzing riparian vegetation change.

机译：动态干旱系统中的土地利用和干扰相互作用：用于监测和分析河岸植被变化的多尺度遥感方法。

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Riparian systems are comprised of interacting aquatic and terrestrial elements that contribute distinctively to the natural capital of arid landscapes. Riparian vegetation is a major component of riparian systems, providing the ecosystem services required to support watershed health. The spatial and temporal distributions of riparian vegetation are influenced by hydrologic and disturbance processes operating at scales from local to regional. I believe both these processes are well suited to monitoring using synoptic and multitemporal approaches.;The research in this dissertation is presented as 3 related studies. The first study focused on historical riparian dynamics related to natural disturbance and land use. Using current and historical riparian vegetation maps, we examined vegetation change within catchments of varying land use intensity. Results suggest that land use activities and wastewater subsidy affect the rate of development and diversity of riparian community types.;The second study used moderate resolution satellite imagery to monitor changes in riparian structure and pattern within a land cover change framework. We classified Landsat Thematic Mapper satellite imagery of the Upper Santa Cruz River watershed using Classification and Regression Tree (CART) models. We tested the ability of our models to capture change at landscape, floodplain, and catchment scales, centering our change detection efforts on a riparian tree die-off episode and found they can be used to describe both general landscape dynamics and disturbance-related riparian change.;The third study examined historical and environmental factors contributing to spatial patterns of vegetation following two riparian tree die-offs. We used high resolution aerial imagery to map locations of individual live and dead trees and collected a suite of environmental variables and historical variables related directly and indirectly to land use and disturbance history. We tested for differences between groups of live and dead trees using Multi-response Permutation Procedures and found strong relationships between historical factors and mortality incidence.;The results from these studies demonstrate the importance of examining historical information and spatial linkages across scales when monitoring riparian vegetation. From a land management perspective, the results identify the need for landscape-level, ecosystem-based management programs to maintain functioning and spatially connected riparian systems.
机译：河岸系统由相互作用的水生和陆地元素组成，它们对干旱景观的自然资本具有独特的贡献。河岸植被是河岸系统的主要组成部分，提供支持流域健康所需的生态系统服务。河岸植被的时空分布受从地方到区域尺度的水文和扰动过程的影响。我相信这两个过程都非常适合使用天气和多时相方法进行监视。;本论文的研究被介绍为3个相关研究。第一项研究关注与自然干扰和土地利用相关的历史河岸动力学。利用当前和历史的河岸植被图，我们研究了不同土地利用强度的流域内的植被变化。结果表明土地利用活动和废水补贴会影响河岸社区类型的发展和多样性。第二项研究使用中等分辨率的卫星图像来监测土地覆盖变化框架内河岸结构和格局的变化。我们使用分类和回归树（CART）模型对圣塔克鲁兹河上游流域的Landsat Thematic Mapper卫星影像进行了分类。我们测试了模型在景观，洪泛区和集水区尺度上捕获变化的能力，将我们的变化检测工作集中在河岸树木死亡事件上，发现它们可用于描述一般的景观动态和与干扰有关的河岸变化。;第三项研究考察了两次河岸树木死亡后造成植被空间格局的历史和环境因素。我们使用高分辨率的航空影像来绘制各个活树和枯树的位置，并收集了一系列与土地利用和干扰历史直接或间接相关的环境变量和历史变量。我们使用多响应置换程序测试了活树和枯树之间的差异，并发现了历史因素和死亡率之间的密切关系。;这些研究的结果表明，在监测河岸植被时，研究跨尺度的历史信息和空间联系非常重要。从土地管理的角度来看，结果表明需要基于景观的，基于生态系统的管理计划来维持功能性和空间相连的河岸系统。

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