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首页> 外文期刊>International journal of remote sensing >Effect of the current major insect outbreaks on decadal phenological and LAI trends in southern Rocky Mountain forests
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Effect of the current major insect outbreaks on decadal phenological and LAI trends in southern Rocky Mountain forests

机译：当前主要昆虫暴发对落基山南部森林年代际物候和LAI趋势的影响

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摘要

Remote sensing is a valuable tool for monitoring the impact of landscape-scale disturbances on ecosystem structure and function. We explore the impact of the ongoing insect outbreaks (Dendroctonus ponderosae, D. rufipennis, and Ips spp.) on southern Rocky Mountain forests, with the goal of assessing the sensitivity of leaf area index (LAI) and phenology metrics to different disturbance severities. Specifically, we investigate the influence of the outbreaks on two important ecosystem metrics, LAI, and phenology (e.g. green-up date, green-up speed, amplitude, etc.). Both were assessed via MODIS: 1000 m LAI (MOD15A2) and 250 m NDVI (MYD13Q1) for the phenology assessment. Trends (2002-2010) in phenology metrics and LAI were compared to different cumulative severities and timing of tree mortality, as determined from aerial surveys. Trends in phenology were significantly correlated with disturbance severity but with very low predictive power. This seems likely due to yearly variations in the onset of snow-fall and snow-melt, which dominate the phenologic signal at the regional scale of this study. Trends in LAI were associated more strongly with both disturbance severity and timing, with landscapes disturbed early in the observation period showing recovery (e.g. a positive trend) in LAI. The LAI, which is related to various vital ecosystem properties like water use and gas exchange, seems to be fairly resilient to even heavy mortality. Further work determining the relative contribution of the various functional groups (trees, shrubs, and grasses) to the LAI recovery is needed to better understand the implications of this large-scale, pervasive disturbance on forest structure and function.
机译：遥感是监测景观尺度干扰对生态系统结构和功能的影响的宝贵工具。我们探讨了正在进行的昆虫暴发（Dendroctonus积果，D。rufipennis和Ips spp。）对落基山南部森林的影响，目的是评估叶面积指数（LAI）和物候指标对不同干扰强度的敏感性。具体来说，我们调查了暴发对两个重要的生态系统指标（LAI）和物候学（例如绿化日期，绿化速度，幅度等）的影响。两者均通过MODIS进行了评估：1000 m LAI（MOD15A2）和250 m NDVI（MYD13Q1）用于物候评估。根据航测，将物候指标和LAI的趋势（2002-2010年）与不同的累积严重程度和树木死亡的时间进行了比较。物候趋势与干扰严重程度显着相关，但预测能力很低。这似乎可能是由于降雪和融雪开始的年度变化所致，在本研究的区域范围内，这主要是物候信号。 LAI的趋势与干扰的严重程度和时机更密切相关，在观察期早期受干扰的景观显示LAI的恢复（例如正趋势）。与各种重要的生态系统特性（如用水和气体交换）有关的LAI似乎对严重的死亡具有相当的抵抗力。需要进一步的工作来确定各种功能组（树木，灌木和草）对LAI恢复的相对贡献，以便更好地了解这种大规模，普遍性干扰对森林结构和功能的影响。

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  • 来源
    《International journal of remote sensing》 |2013年第20期|7249-7274|共26页
  • 作者

    Brian Buma; Evan T. Pugh; Carol A. Wessman;

  • 作者单位

    Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309, USA,Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309 USA;

    Department of Geological Sciences, University of Colorado, Boulder, CO 80309, USA;

    Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309, USA,Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309 USA;

  • 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
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