阿拉斯加内陆育空河流域植被覆盖变化:2000 - 2018年MODIS绿度趋势估算

IF 0.5 4区 环境科学与生态学 Q4 ECOLOGY
C. Potter
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引用次数: 1

摘要

为了解阿拉斯加内陆育空河流域生态系统植被变化的近期格局,分析了2000 - 2018年250 m分辨率MODIS植被指数(NDVI)时间序列的生长季趋势和变化。对NDVI时间序列的变化进行了统计分析,采用了“累加季节和趋势的中断”方法(BFAST)。该结构变化分析表明,自2000年以来,NDVI断点和植被绿度的负18年趋势在很大程度上可以由严重野火的影响来解释,这些野火通常影响相对低海拔(< 300 m)的灌木和森林生态系统。育空河流域研究区内29%的MODIS像元至少检测到一个NDVI断点。研究发现,研究期间最温暖和最潮湿的年份与相当一部分(30%)的NDVI断点有关。在未检测到NDVI断点的像元中,森林和灌木的趋势都向正趋势值强烈倾斜。逐步NDVI趋势分析的结果支持了这样的假设,即在过去20年里,阿拉斯加内陆的灌木丛和林地(未燃烧的)植被生长速度加快了。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Changes in Vegetation Cover of Yukon River Drainages in Interior Alaska: Estimated from MODIS Greenness Trends, 2000 to 2018
Abstract Trends and transitions in the growing season MODerate resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) time series at 250-m resolution were analyzed for the period from 2000 to 2018 to understand recent patterns of vegetation change in ecosystems of the Yukon River basin in interior Alaska. Statistical analysis of changes in the NDVI time series was conducted using the “Breaks for Additive Seasonal and Trend” method (BFAST). This structural change analysis indicated that NDVI breakpoints and negative 18-yr trends in vegetation greenness over the years since 2000 could be explained in large part by the impacts of severe wildfires, commonly affecting shrubland and forested ecosystems at relatively low elevations (< 300 m). At least one NDVI breakpoint was detected at 29% of the MODIS pixels within the Yukon River basin study area. The warmest and wettest years in the study time period were found to be associated with a sizeable fraction (30%) of NDVI breakpoints. Among pixels with no NDVI breakpoints detected, both forest and shrubland trends were strongly skewed toward positive trend values. Results from gradual NDVI trend analysis supported the hypothesis that air temperature warming has enhanced the rates of (unburned) vegetation growth in shrubland and woodlands across interior Alaska over the past two decades.
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来源期刊
Northwest Science
Northwest Science 环境科学-生态学
CiteScore
1.30
自引率
0.00%
发文量
23
审稿时长
>36 weeks
期刊介绍: The pages of Northwest Science are open to original and fundamental research in the basic, applied, and social sciences. All submissions are refereed by at least two qualified peer reviewers. Papers are welcome from authors outside of the Pacific Northwest if the topic is suitable to our regional audience.
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