Journal Article

FZJ-2021-03054

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Sentinel-2 Analysis of Spruce Crown Transparency Levels and their Environmental Drivers after Summer Drought in the Northern Eifel (Germany)

Montzka, C. (Corresponding author)FZJ* ; Bayat, B.FZJ* ; Tewes, A.FZJ* ; Mengen, D.FZJ* ; Vereecken, H.FZJ*

2021
Frontiers Media Lausanne

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Please use a persistent id in citations: http://hdl.handle.net/2128/28322  doi:10.3389/ffgc.2021.667151

Abstract: Droughts 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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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. 2173 - Agro-biogeosystems: controls, feedbacks and impact (POF4-217) (POF4-217)

Appears in the scientific report 2021

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Database coverage:
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