TY - JOUR

T1 - Does fragmentation contribute to the forest crisis in Germany?

AU - Mann, Deepika

AU - Gohr, Charlotte

AU - Blumröder, Jeanette S.

AU - Ibisch, Pierre L.

N1 - Publisher Copyright: Copyright © 2023 Mann, Gohr, Blumröder and Ibisch.

PY - 2023/1/20

Y1 - 2023/1/20

N2 - Intact forests contribute to the ecosystem functionality of landscapes by storing and sequestering carbon, buffering and cooling the microclimate, and providing a range of related ecosystem functions. Forest fragmentation not only poses a threat to many organisms but also reduces the resistance and resilience of the ecosystem, which is especially relevant to the ongoing climate crisis. The effects of recent extreme heat years on forests in Germany have not been studied in detail for the influence of fragmentation. We investigate the relation of forest fragmentation with temperature and vitality in Germany per ecoregion at the canopy level using satellite imagery at 1-km and 30-m resolution. We compiled and correlated forest maps for connectivity based on Thiessen polygons, canopy temperatures on the hottest days based on land surface temperature, and forest vitality based on the maximum normalized difference vegetation index per growing season. We differentiated between ecoregions and main forest types. In 2022, larger intact tree-covered areas that are less fragmented have relatively low temperatures on hot days and higher overall vitality. Nearly 98% of the almost 1.95 million forest fragments at 30-m resolution in Germany are smaller than 1 km2, which cover nearly 30% of the total forest area. To counteract the forest crisis, forest and landscape management should aim to reduce fragmentation and maintain tree biomass and forest cover in the landscape. Increasing the size of continuous forest fragments contributes to ecosystem-based adaptation to climate change.

AB - Intact forests contribute to the ecosystem functionality of landscapes by storing and sequestering carbon, buffering and cooling the microclimate, and providing a range of related ecosystem functions. Forest fragmentation not only poses a threat to many organisms but also reduces the resistance and resilience of the ecosystem, which is especially relevant to the ongoing climate crisis. The effects of recent extreme heat years on forests in Germany have not been studied in detail for the influence of fragmentation. We investigate the relation of forest fragmentation with temperature and vitality in Germany per ecoregion at the canopy level using satellite imagery at 1-km and 30-m resolution. We compiled and correlated forest maps for connectivity based on Thiessen polygons, canopy temperatures on the hottest days based on land surface temperature, and forest vitality based on the maximum normalized difference vegetation index per growing season. We differentiated between ecoregions and main forest types. In 2022, larger intact tree-covered areas that are less fragmented have relatively low temperatures on hot days and higher overall vitality. Nearly 98% of the almost 1.95 million forest fragments at 30-m resolution in Germany are smaller than 1 km2, which cover nearly 30% of the total forest area. To counteract the forest crisis, forest and landscape management should aim to reduce fragmentation and maintain tree biomass and forest cover in the landscape. Increasing the size of continuous forest fragments contributes to ecosystem-based adaptation to climate change.

KW - forest cover

KW - forest fragmentation

KW - land surface temperature (LST)

KW - normalized difference vegetation index (NDVI)

KW - Thiessen connectivity

UR - http://www.scopus.com/inward/record.url?scp=85147386386&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/f0025fa9-df16-3f11-be6a-20f9bd7b8d57/

U2 - 10.3389/ffgc.2023.1099460

DO - 10.3389/ffgc.2023.1099460

M3 - Journal articles

AN - SCOPUS:85147386386

VL - 6

JO - Frontiers in Forests and Global Change

JF - Frontiers in Forests and Global Change

SN - 2624-893X

M1 - 1099460

ER -