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    FW-I-7: Forest condition

    A line graph shows the mean crown defoliation in percent for the total forest and the tree species spruce, pine, beech and oak for the period 1991 to 2017. For beech there is a significant increasing trend, for oak it is quadratically decreasing. There is no trend for the other tree species and the total forest.

    … the other tree species and the total forest. Source: BMEL (forest condition survey) Download image (173.98 kB) Tags forest Competence Centre on Climate Impacts and …

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    WW-I-8: Water temperature in lakes

    The line chart WW-I-8 ’Water temperature in lakes’ shows the annual deviation of the mean temperature of surface waters during the season, April to October, compared to the 2014 value for the watercourses in selected regions. The regions considered are the North German Plain – in one case including the river lakes, in another without the river lakes – as well as the uplands and the Alps-and-foothills.

    … NI NLWKN/ SN LTV/ ST LHW/ TH TLUBN/ TH TFW (lake monitoring/ reservoir monitoring) Download image (232.29 kB) The following contents contain this medium: WW-I-8: Water …

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    WW-I-7: Water levels in lakes

    The line chart WW-I-7 ’Water levels in lakes’ indicates the annual deviation of the water level in lakes in two regions – the North German Plain and the Alps-and-foothills for the years 1961 to 2021 from the water level in 2014 in centimetres. The water level of the lakes in the North German Plain receded significantly by 2021 compared to 2014; ultimately the deviation amounted to –20 cm compared to 2014.

    … BE SenMVKU/ BY LfU/ MV MLU/ NI NLWKN/ SH LLUR/ ST LHW (water level measurements) Download image (163.33 kB) The following contents contain this medium: WW-I-7: Water …

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    BD-I-1: Phenological changes in wild plant species

    The illustration contains a stacked column chart which shows the beginning and duration of the phenological seasons for the periods of 1951 to 1980, 1981 to 2010 and 1992 to 2021. This demonstrates that, by comparison, winter has become shorter which also applies to spring and high summer. The early summer has become longer by approximately two days.

    … changes in wild plant species Source: DWD (phenological observation network) Download image (138.01 kB) The following contents contain this medium: BD-I-1: …

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    FW-I-8: Forest fire hazards and forest fires

    The line chart FW-I-8 ‘Forest fire hazards and forest fires’ contains two lines which indicate the development of terrain affected by forest fires in hectares and the mean number of days with fire reports in hazard categories (FWI 4 + 5) at stations in areas with very high to medium forest fire hazards. The terrain affected by forest fires suffered several distinct peaks in the period of 1991 to 2021. In 1992 the affected terrain comprised just under 5,000 hectares.

    … fires Source: BLE (forest fire statistics Germany)/ DWD (regionalised Canadian FWI) Download image (161.16 kB) The following contents contain this medium: FW-I-8: …

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    FW-I-4: Dieback rate

    The line chart FW-I-4 ’Dieback rate’ shows – for the tree species of pine, spruce, beech and oak and for all these tree species combined – the crown defoliation mean in per cent for the period of 1990 to 2021. Up until 2018 the species-specific dieback rate fluctuated between 0.0 and 0.5 per cent. In those years, the dieback rate in respect of oak was mostly slightly higher than that of other tree species. In the years of 2019, 2020 and 2021 the dieback rates of all tree species increased distinctly.

    … FW-I-4: Dieback rate Source: BMEL (nationwide forest condition survey) Download image (124.07 kB) The following contents contain this medium: FW-I-3 + 4: …