A First Assessment of Canopy Cover Loss in Germany’s Forests after the 2018–2020 Drought Years

Central Europe was hit by several unusually strong periods of drought and heat between 2018 and 2020. These droughts affected forest ecosystems. Cascading effects with bark beetle infestations in spruce stands were fatal to vast forest areas in Germany. We present the first assessment of canopy cove...

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Published in:Remote sensing (Basel, Switzerland) Switzerland), 2022-02, Vol.14 (3), p.562
Main Authors: Thonfeld, Frank, Gessner, Ursula, Holzwarth, Stefanie, Kriese, Jennifer, da Ponte, Emmanuel, Huth, Juliane, Kuenzer, Claudia
Format: Article
Language:English
Subjects:
Anomalies
Bark
Canopies
canopy cover loss
Coniferous forests
Datasets
disturbance index
Drought
forest
Forest ecosystems
Forests
Landsat
Landsat-8
Mathematical analysis
Quantiles
Remote sensing
Satellites
Sentinel-2
Terrestrial ecosystems
Time series
Trees
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Gessner, Ursula
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description Central Europe was hit by several unusually strong periods of drought and heat between 2018 and 2020. These droughts affected forest ecosystems. Cascading effects with bark beetle infestations in spruce stands were fatal to vast forest areas in Germany. We present the first assessment of canopy cover loss in Germany for the period of January 2018–April 2021. Our approach makes use of dense Sentinel-2 and Landsat-8 time-series data. We computed the disturbance index (DI) from the tasseled cap components brightness, greenness, and wetness. Using quantiles, we generated monthly DI composites and calculated anomalies in a reference period (2017). From the resulting map, we calculated the canopy cover loss statistics for administrative entities. Our results show a canopy cover loss of 501,000 ha for Germany, with large regional differences. The losses were largest in central Germany and reached up to two-thirds of coniferous forest loss in some districts. Our map has high spatial (10 m) and temporal (monthly) resolution and can be updated at any time.
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subjects Anomalies
Bark
Canopies
canopy cover loss
Coniferous forests
Datasets
disturbance index
Drought
forest
Forest ecosystems
Forests
Landsat
Landsat-8
Mathematical analysis
Quantiles
Remote sensing
Satellites
Sentinel-2
Terrestrial ecosystems
Time series
Trees
title A First Assessment of Canopy Cover Loss in Germany’s Forests after the 2018–2020 Drought Years
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