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Regional analysis of MODIS satellite greenness trends for ecosystems of interior Alaska

机译：阿拉斯加内部生态系统MODIS卫星绿色趋势的区域分析

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摘要

Trends in the growing season Moderate Resolution Imaging Spectroradiometer (MODIS) Enhanced Vegetation Index (EVI) time-series were analyzed for the time period from 2000 to 2010 to understand landscape-level patterns of vegetation change in ecosystems of interior Alaska. The analysis compared data-sets for Alaska vegetation cover types, wetland cover classes, wildfire boundaries since the 1940s, permafrost type, and elevation to identify the most likely combination of factors driving regional changes in habitat quality and ecosystem productivity. Approximately 48% of all ecosystem areas in interior Alaska were detected with significant (p ＜ 0.05) positive or negative MODIS growing season EVI trends from 2000 to 2010. Three-quarters of these ecosystem areas (nearly 110,000 km~2 ) were detected with significant positive growing season EVI trends. The vast majority of interior Alaska area detected with significant positive growing season EVI trends was classified as upland shrub cover, although non-forested wetlands (marshes, bogs, fens, and floodplains) were colocated on 13% of that total area. Evidence supports the hypothesis that temperature (warming) has markedly enhanced the rates of shrubland and tundra vegetation growth across interior Alaska over recent years.
机译：分析了2000年至2010年这段时间的生长季节中分辨率成像光谱仪（MODIS）增强植被指数（EVI）时间序列的趋势，以了解阿拉斯加内部生态系统中植被变化的景观格局。分析比较了阿拉斯加植被覆盖类型，湿地覆盖类型，自1940年代以来的野火边界，多年冻土类型和海拔高度的数据集，以确定驱动栖息地质量和生态系统生产力区域变化的最可能因素组合。从2000年到2010年，在阿拉斯加内部大约48％的生态系统区域被发现具有显着（p ＜0.05）的MODIS正或负显着EVI趋势。在这些生态系统区域中，有四分之三（近110,000 km〜2）被发现具有显着（p <0.05）生长季EVI趋势良好。尽管非森林湿地（沼泽，沼泽，沼泽和洪泛区）位于该地区总面积的13％，但发现的阿拉斯加内部绝大多数地区都具有明显的生长期EVI趋势，被归类为高地灌木覆盖。有证据支持以下假设：近年来，温度（变暖）显着提高了阿拉斯加内部灌木丛和苔原植被的生长速度。

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