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Monitoring the vegetation kinetics after clear cuts due to bark beetle invasion

Abstract : Large areas of the Vosges Mountains (North-East France) are actually submitted to clear cuts due to the invasion of spruce (Picea abies) stands by a bark beetle (Ips typograpus). The clear cuts are organized to save as much timber as possible but leave large soil areas without cover, prone to accelerated erosion in steep slopes. The question of reforestation is still open but lowland vegetation has started to appear (brambles, brooms, heathers, etc.). In some stands, natural regeneration is taking place. An impact of these clear cuts on the surface water quality of the headstreams flowing close to them is possible and should be investigated. To monitor the greening due to the mostly annual development of this new vegetation, satellite images are being used. Sentinel-2 images (ULU and UGP tiles, 10 m spatial resolution, available since 2017) have been retrieved. For earlier data, Landsat images (available on https://glovis.usgs.gov/) can be used but their spatial resolution is lower (30 m). Images with clouds over the areas of interest or snow have been discarded. The areas of interest (i.e. zones of clear cuts) have been defined after land surveys. The images have been used to calculate the Normalized Difference Vegetation Index (NDVI) using QGIS (https://www.qgis.org). To take into account the variation of global illumination during the year, reference zones have been defined in nearby lakes (Gérardmer, Longemer, Kruth). The vegetation kinetics of plots which have been cut over the last two years will be compared. In the case of the Pleinot watershed (Girmont-Val d’Ajol- Vosges Mountains, France), the changes in water quality (minerals and dissolved organic matter) of the headstream crossing one of the clear cuts will be discussed.
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https://hal.univ-lorraine.fr/hal-03398871
Contributor : Marie-Noëlle Pons Connect in order to contact the contributor
Submitted on : Tuesday, October 26, 2021 - 6:06:24 PM
Last modification on : Thursday, October 28, 2021 - 4:09:43 AM

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  • HAL Id : hal-03398871, version 1

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Marie-Noëlle Pons, Anne Poszwa. Monitoring the vegetation kinetics after clear cuts due to bark beetle invasion. 1st OZCAR TERENO International Conference, Oct 2021, Strasbourg, France. ⟨hal-03398871⟩

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