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Correlation between the dynamics and spatial configuration of the circumarctic latitudinal forest-tundra ecotone
International Journal of Remote Sensing ( IF 3.4 ) Pub Date : 2020-12-07 , DOI: 10.1080/01431161.2020.1826062
Wenkai Guo 1 , Gareth Rees 1
Affiliation  

ABSTRACT This study uses the MOderate Resolution Image Spectroradiometer (MODIS) Vegetation Continuous Fields (VCF) data to investigate the relationship between the dynamics of the circumarctic latitudinal forest-tundra ecotones (FTEs) and its spatial configuration. This study also explores the extent to which the Google Earth Engine (GEE) can enable efficient, large-scale and multi-temporal examination of the circumarctic FTE. FTE dynamics is represented by latitudinal interface movement over the 2000 to 2015 period. To represent spatial configuration of the latitudinal FTEs, we propose a continuous measurement of fragmentation derived from window spectral analysis, which builds on the theory of FTE ‘forms’ – a discrete categorization of altitudinal FTEs primarily based on vegetation fragmentation. Additionally, continentality of the FTEs is calculated to investigate the impact of water variability. Statistical relationship between these variables are analysed in evenly divided longitudinal bands in the circumarctic region containing FTEs. More fragmented latitudinal FTEs are found to be more likely to shift northward in the study period, and FTEs in more continental areas are mostly more fragmented. These empirical results show that similar linkages exist between circumarctic latitudinal FTE fragmentation and dynamics to those found in altitudinal FTEs. This can potentially contribute to the optimization of future climate modelling as well as modelling of vegetation reactions to climate change. The GEE platform enables the examination of latitudinal FTEs through efficient circumarctic-scale vegetation data assimilation and processing, and the methodological framework allows for future incorporation of additional variables of interest into the analysis.

中文翻译:

环北极纬向森林-苔原交错带动态与空间构型的相关性

摘要 本研究使用中分辨率影像光谱仪 (MODIS) 植被连续场 (VCF) 数据来研究环北极纬度森林-苔原交错带 (FTE) 动态与其空间配置之间的关系。本研究还探讨了 Google 地球引擎 (GEE) 能够在多大程度上实现对环北极 FTE 的高效、大规模和多时间检查。FTE 动态以 2000 年至 2015 年期间的纬度界面运动为代表。为了表示纬度 FTE 的空间配置,我们提出了从窗口光谱分析得出的连续破碎测量,该分析建立在 FTE“形式”的理论之上——主要基于植被破碎的海拔 FTE 的离散分类。此外,计算 FTE 的大陆性以研究水变率的影响。在包含 FTE 的环北极地区均匀划分的纵向带中分析这些变量之间的统计关系。在研究期间,发现更分散的纬度 FTE 更有可能向北移动,而更多大陆地区的 FTE 大多更加分散。这些实证结果表明,环北极纬度 FTE 碎片化和动力学与海拔 FTE 中发现的那些之间存在类似的联系。这可能有助于优化未来的气候建模以及植被对气候变化的反应建模。GEE 平台能够通过高效的环北极植被数据同化和处理来检查纬度 FTE,
更新日期:2020-12-07
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