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European Journal of Forest Research

, Volume 126, Issue 4, pp 529–544 | Cite as

Signals of summer drought in crown condition data from the German Level I network

  • Walter SeidlingEmail author
Original Paper

Abstract

Crown transparency estimates of Scots pine, Norway spruce, common beech, pedunculate and sessile oak, annually surveyed between 1990 and 2004 within a grid over Germany, provide a suitable response variable to study drought effects on forest trees. Major climatic factors, available on a monthly basis as plot-specifically interpolated values and parameters of site and stand conditions, biotic and other relevant factors were used as predictors in different cross- and length-sectional, and longitudinal models. Stand age is a considerable and most constant driver of crown transparency in all species. Pine, spruce and beech responded—mainly with a delay of 1 year—with some foliar loss in areas where there was a surplus of temperature after the generally hot and dry summer of 2003. Parallel time-series analyses delivered species-specific geographic large-scale patterns with delayed or recent precipitation deficits or temperature surpluses. Even if beech is partly responding in current years with leaf loss towards precipitation surpluses, defoliation is especially high 1 year after hot summers, partly a result of high seed sets after such summers. Crown condition of oak responds in dry and warm areas according to the drought stress hypothesis, however, in cool and wet mountainous ranges oak responds after wet summers with higher defoliation. Longitudinal approaches revealed for all 4-tree species significant relationships between crown condition and deviations from the long-term means of temperature, precipitation but also global radiation and wind speed. Results do not always match the drought stress hypothesis, however, this is not to expect considering the heterogeneous site, stand and climatic conditions across Germany. Complex interactions of climatic and biotic factors also impede simple relationships. Soil-related clusters reveal higher sensitivity of spruce and beech towards climatic drought factors on more acid soils with thin humus layers. Also clusters constructed from plot-specific courses of defoliation reveal groups with rather closer relationships like a group of pine plots in the Oberpfalz, which seems to be especially sensitive to summer drought.

Keywords

Defoliation Water stress Climatic change Scots pine Norway spruce Common beech Oak Longitudinal analyses Time-series cross-sectional models 

Notes

Acknowledgments

This study was funded by the Federal Ministry of Nutrition, Agriculture and Consumers Protection. I acknowledge Prof. Dr. Andreas Linde for his forward project management and Prof. and Dir. Dr. Sigfried Anders for providing working facilities. Prof. Dr. Barbara Wolff is acknowledged for encouraging discussions and proof reading, Dr. Wolfgang Beck, Dr. Jürgen Müller, and Dr. Wolf-Ulrich Kriebitzsch and two referees for fruitful discussions and substantial hints and Dr. Uwe Starfinger for assistance with the English.

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© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Institute for Forest Ecology and Forest InventoriesFederal Research Centre for Forestry and Forest ProductsEberswaldeGermany

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