Are Scots pine forest edges particularly prone to drought-induced mortality?


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Are Scots pine forest edges particularly prone to drought-induced mortality?
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Buras, Allan
Schunk, Christian
Zeiträg, Claudia
Herrmann, Corinna
Kaiser, Laura
Lemme, Hannes
Straub, Christoph
Taeger, Steffen
Gößwein, Sebastian
Klemmt, Hans-Joachim
Menzel, Annette
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Institute of Physics (IOP)
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Climate change is expected to exacerbate the frequency of drought-induced tree mortality world-wide. To better predict the associated change of species composition and forest dynamics on various scales and develop adequate adaptation strategies, more information on the mechanisms driving the often observed patchiness of tree die-back is needed. Although forest-edge effects may play an important role within the given context, only few corresponding studies exist. Here, we investigate the regional die-back of Scots pine in Franconia, Germany, after a hot and dry summer in 2015, thereby emphasizing possible differences in mortality between forest edge and interior. By means of dendroecological investigations and close-range remote sensing, we assess long-term growth performance and current tree vitality along five different forest-edge distance gradients. Our results clearly indicate a differing growth performance between edge and interior trees, associated with a higher vulnerability to drought, increased mortality rates, and lower tree vitality at the forest edge. Prior long-lasting growth decline of dead trees compared to live trees suggests depletion of carbon reserves in course of a long-term drought persisting since the 1990s to be the cause of regional Scots pine die-back. These findings highlight the forest edge as a potential focal point of forest management adaptation strategies in the context of drought-induced mortality.

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hello everybody my name is I lasted ecologists working on Denver ecology remote sensing and climate change and today I want to give you a brief introduction into our environment research center where addressed the question to ask us think forests edges just particularly prone to drought mortality the reason for asking this
question was the hot and dry summer 2015 in Central Europe after which a pronounced Scots pine died at was observed we got a visual impression that forest edges were particularly affected as can be seen in this image many of the Scots pine canopies have a brown color indicating a low tree vitality in our
investigation we follow a dual approach combining data ecological means with remote sensing techniques we investigated 5 different Scots pine stands in for a whole new Germany particularly emphasizing on the difference between forest edge and interior for the dendrochronological so we analyzed 152 Scots Pine specimens for Ringwood's properties individual growth patterns and climate growth relationships with regard to remote sensing we used a drone to obtain any BI the normalized difference vegetation index for 6 thousand 649 Scots pine canopies to analyze their vitality along a forest edge distance gradient the
subsequent Analyses indicated that the trees were more frequently observed at the forest edge and moreover they revealed preceding growth depressions as indicated by the orange line in the other panel in terms of a long-term drought which was indicated by negative as P. E. I values from 1990 onwards in the long term we
consistently palm trees to be significantly smaller at the forest edge a principal gradient
analysis indicated that growth patterns differ between the edge and interior across all sites more we followed labeled only with ratios to be significantly lower at the forest edge finally climate
growth relationships indicated a significantly higher drought susceptibility of trees growing at the forest edge the close friend remote
sensing images revealed law talent t of trees growing of the forest edge as indicated by lower in DVI values this impression was
supported by a nonlinear models computed at all sites which revealed a significant effect of the distance to the forest edge on tree vitality possible
mechanisms explaining our observations are related to microclimate with elevated temperatures wind speeds and insulation rates and lower relative humidity and soil water capacities at the forest edge in combination with large economy volumes this like it results in a high water demand and low water availability of forest edge trees as a consequence the forest edge may play an important role in terms of drought-induced tree mortality particularly under the anticipated droughts in course of anthropogenic climate change to conclude want we can say
yes so outstanding forest edges are particularly prone to dropping use mortality further research should investigate on other species to test whether they are connected in a similar manner if you are interested in getting to know all the details of our investigation please have a closer look at our environmental research enjoy the really


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