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000894127 1001_ $$0P:(DE-Juel1)129506$$aMontzka, Carsten$$b0$$eCorresponding author
000894127 245__ $$aSentinel-2 Analysis of Spruce Crown Transparency Levels and their Environmental Drivers after Summer Drought in the Northern Eifel (Germany)
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000894127 520__ $$aDroughts in recent years weaken the forest stands in Central Europe, where especially the spruce suffers from an increase in defoliation and mortality. Forest surveys monitor this trend based on sample trees at the local scale, whereas earth observation is able to provide area-wide information. With freely available cloud computing infrastructures such as Google Earth Engine, access to satellite data and high-performance computing resources has become straightforward. In this study, a simple approach for supporting the spruce monitoring by Sentinel-2 satellite data is developed. Based on forest statistics and the spruce NDVI cumulative distribution function of a reference year, a training data set is obtained to classify the satellite data of a target year. This provides insights into the changes in tree crown transparency levels. For the Northern Eifel region, Germany, the evaluation shows an increase in damaged trees from 2018 to 2020, which is in line with the forest inventory of North Rhine-Westphalia. An analysis of tree damages according to precipitation, land surface temperature, elevation, aspect, and slope provides insights into vulnerable spruce habitats of the region and enables to identify locations where the forest management may focus on a transformation from spruce monocultures to mixed forests with higher biodiversity and resilience to further changes in the climate system.
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000894127 7001_ $$0P:(DE-Juel1)177038$$aBayat, B.$$b1
000894127 7001_ $$0P:(DE-Juel1)180165$$aTewes, A.$$b2
000894127 7001_ $$0P:(DE-Juel1)164844$$aMengen, D.$$b3
000894127 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b4
000894127 773__ $$0PERI:(DE-600)2968523-0$$a10.3389/ffgc.2021.667151$$p667151$$tFrontiers in forests and global change$$v4$$x2624-893X$$y2021
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