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26.11.2019

New paper: more frost damage of apple trees

In their latest article, THESys researchers Peter Pfleiderer and Carl-Friedrich Schleussner together with Inga Merke show the increasing risks of apple tree frost damage under climate change.

Unexpected effects of climate change 

Anthropogenic climate change is affecting agriculture and crop production. The responses of horticultural and agricultural systems to changing climatic conditions can be non-linear and at times counter-intuitive. Depending on the characteristics of the system, the actual impact can arise as a result of a combination of climate hazards, or compound events.

In this paper, the authors show that compound events can lead to increased risk of frost damage for apple fruit trees in Germany in a 2°C warmer world of up to 10% relative to present day. Although the absolute number of frost days is declining, warmer winters also lead to earlier blossom of fruit trees, which in turn can lead to regionally dependent increased risks of the occurrence of frost days after apple blossom. In southern Germany, warmer winters may also lead to an increase in years in which apple yield is negatively affected by a lack of sufficient amount of cold days to trigger the seasonal response of the trees.

The authors’ result shows how cropping system responses to seasonal climate can lead to unexpected effects of increased risk of frost damage as a result of warmer winters. An improved understanding of ecosystem responses to changes in climate signals is important to fully assess the impacts of climate change.

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Source   IRI THESys | Humboldt-Universität zu Berlin 2019

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