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首页> 外文学位 >Using remote sensing to monitor herbicide injury and biomass of waterhyacinth [Eichhornia crassipes (Mart.) Solms].
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Using remote sensing to monitor herbicide injury and biomass of waterhyacinth [Eichhornia crassipes (Mart.) Solms].

机译：利用遥感监测除草剂的危害和凤眼兰的生物量[凤眼莲（Sichms）。

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摘要

Aquatic vegetation plays an important role in the ecological interactions and processes within a water body. However, the presence of the invasive exotic aquatic plant species, waterhyacinth [Eichhornia crassipes (Mart.) Solms], negatively affects those interactions as well as interfering with water use for recreation and navigation. An implemented management plan for waterhyacinth control relies on the use of herbicides. Efficacy is commonly assessed using visual injury and control ratings as well as estimating biomass. The problem is that those approaches are labor intensive only assessing single points throughout the entire water body. Therefore, technology like remote sensing, which is the focus of this research, is recommended as an additional tool to assess implemented management plans.;Studies were conducted in a mesocosm research facility to evaluate the relationship between simulated spectral bands 3, 4, 5, and 7 Landsat 5 TM and waterhyacinth treated with the herbicides imazapyr and glyphosate. Results indicate that injury is better detected and predicted with band 4 and that relationship is negative when either herbicide was used. However, prediction is better when plants have developed sufficient injury to influence the spectral response of band 4.;In the second study, the biomass of waterhyacinth was estimated using the Normalized Difference Vegetation Index (NDVI) using simulated data from Landsat 5 TM. This study was conducted over natural populations of waterhyacinth in Lakes Columbus and Aberdeen, MS over two growing seasons. Results indicate that the use of NDVI alone is a weak predictor of biomass; however, its combination with morphometric parameters like leaf area index enhanced predictive capabilities.;In order to assess field herbicide treatments for waterhyacinth control and its consequent impact on native aquatic vegetation, lake-wide surveys were performed in Lake Columbus, MS using a point-intercept method. The herbicide assessed was 2,4-D which was applied aerially and by boats. Point-intercept surveys in a 400 by 400 grid of points aided with global positioning system (GPS) were performed before and after herbicide treatments. Obtained results indicate that the frequency of occurrence of waterhyacinth significantly decreased after herbicide treatments which consequently led to the reestablishment of native aquatic vegetation on the system.
机译：水生植被在水体内的生态相互作用和过程中起着重要作用。但是，外来入侵水生植物物种水葫芦[Eichhornia crassipes（Mart。）Solms]的存在会对这些相互作用产生负面影响，并干扰娱乐和航行用水。实施的水葫芦控制管理计划依赖于除草剂的使用。通常使用视觉损伤和控制等级以及评估生物量来评估功效。问题在于这些方法劳动强度大，仅评估整个水体中的单个点。因此，建议将遥感技术作为本研究的重点，作为评估已实施管理计划的附加工具。;在中观研究机构中进行了研究，以评估模拟光谱带3、4、5之间的关系。和7 Landsat 5 TM和凤眼兰，用除草剂依马西平和草甘膦处理。结果表明，使用波段4可以更好地检测和预测伤害，并且当使用任何一种除草剂时，这种关系都是负的。但是，当植物受到足够的伤害以影响4带的光谱响应时，预测会更好。在第二项研究中，使用Landsat 5 TM的模拟数据，使用归一化植被指数（NDVI）估算了风信子的生物量。这项研究是在两个生长季节对哥伦布湖和密西西比州阿伯丁的凤眼兰自然种群进行的。结果表明，单独使用NDVI不能预测生物量。然而，将其与叶面积指数之类的形态计量学参数相结合，增强了预测能力。为了评估田间除草剂对水葫芦的控制作用及其对原生水生植物的影响，在密苏里州哥伦布湖进行了全湖调查，方法是：拦截方法。所评估的除草剂为2,4-D，可通过空中和乘船施用。在除草剂处理之前和之后，在400 x 400的点数辅助下进行点截取调查，这些点数借助全球定位系统（GPS）进行了处理。获得的结果表明，除草剂处理后，风信子的发生频率显着降低，从而导致系统上天然水生植被的重建。

著录项

  • 作者

    Robles, Wilfredo.;

  • 作者单位

    Mississippi State University.;

  • 授予单位 Mississippi State University.;
  • 学科 Biology Botany.;Biology Ecology.;Remote Sensing.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 100 p.
  • 总页数 100
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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