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Vedanatomisk analyse af trækul fra Verer Midtre, gnr/bnr 42/5, Farsund kommune, Agder fylke, Norge
Get PDFNo Future Growth Enhancement Expected at the Northern Edge for European Beech due to Continued Water Limitation
Get PDFABSTRACT With ongoing global warming, increasing water deficits promote physiological stress on forest ecosystems with negative impacts on tree growth, vitality, and survival. How individual tree species will react to increased drought stress is therefore a key research question to address for carbon accounting and the development of climate change mitigation strategies. Recent tree-ring studies have shown that trees at higher latitudes will benefit from warmer temperatures, yet this is likely highly species-dependent and less well-known for more temperate tree species. Using a unique pan-European tree-ring network of 26,430 European beech (Fagus sylvatica L.) trees from 2118 sites, we applied a linear mixed-effects modeling framework to (i) explain variation in climate-dependent growth and (ii) project growth for the near future (2021?2050) across the entire distribution of beech. We modeled the spatial pattern of radial growth responses to annually varying climate as a function of mean climate conditions (mean annual temperature, mean annual climatic water balance, and continentality). Over the calibration period (1952?2011), the model yielded high regional explanatory power (R2?=?0.38?0.72). Considering a moderate climate change scenario (CMIP6 SSP2-4.5), beech growth is projected to decrease in the future across most of its distribution range. In particular, projected growth decreases by 12%?18% (interquartile range) in northwestern Central Europe and by 11%?21% in the Mediterranean region. In contrast, climate-driven growth increases are limited to around 13% of the current occurrence, where the historical mean annual temperature was below ~6°C. More specifically, the model predicts a 3%?24% growth increase in the high-elevation clusters of the Alps and Carpathian Arc. Notably, we find little potential for future growth increases (?10 to +2%) at the poleward leading edge in southern Scandinavia. Because in this region beech growth is found to be primarily water-limited, a northward shift in its distributional range will be constrained by water availability.With ongoing global warming, increasing water deficits promote physiological stress on forest ecosystems with negative impacts on tree growth, vitality, and survival. How individual tree species will react to increased drought stress is therefore a key research question to address for carbon accounting and the development of climate change mitigation strategies. Recent tree-ring studies have shown that trees at higher latitudes will benefit from warmer temperatures, yet this is likely highly species-dependent and less well-known for more temperate tree species. Using a unique pan-European tree-ring network of 26,430 European beech (Fagus sylvatica L.) trees from 2118 sites, we applied a linear mixed-effects modeling framework to (i) explain variation in climate-dependent growth and (ii) project growth for the near future (2021–2050) across the entire distribution of beech. We modeled the spatial pattern of radial growth responses to annually varying climate as a function of mean climate conditions (mean annual temperature, mean annual climatic water balance, and continentality). Over the calibration period (1952–2011), the model yielded high regional explanatory power (R2 = 0.38–0.72). Considering a moderate climate change scenario (CMIP6 SSP2-4.5), beech growth is projected to decrease in the future across most of its distribution range. In particular, projected growth decreases by 12%–18% (interquartile range) in northwestern Central Europe and by 11%–21% in the Mediterranean region. In contrast, climate-driven growth increases are limited to around 13% of the current occurrence, where the historical mean annual temperature was below ~6°C. More specifically, the model predicts a 3%–24% growth increase in the high-elevation clusters of the Alps and Carpathian Arc. Notably, we find little potential for future growth increases (−10 to +2%) at the poleward leading edge in southern Scandinavia. Because in this region beech growth is found to be primarily water-limited, a northward shift in its distributional range will be constrained by water availability
Panel: Digital Preservation in the Cloud
No full textWith cloud-based storage architectures and cloud-based preservation management services, the spectrum of how things are kept safe has become more diverse than ever. This panel consists of representatives from organisations or projects researching and evaluating preservation solutions or using commercial solutions either on-premise or in the cloud. The discussion will focus on the cloud questions independent of commercial solutions used by the organisations
Smuds på officersstandens ære. Den pinlige sag om løjtnant Stürup af De Vestindiske Tropper
No full textEn officer af De Dansk Vestindiske Tropper kom i 1778 i klammeri med flere medlemmer af borgerskabet på St. Jan. Episoden endte med hans fængsling og senere hans desertion, hvilket var helt uhørt for en officer. Hans sag afdækker forholdet mellem de forskellige grupperinger på øen i slavetidens Vestindien. Dels forholdet mellem de militære og civile hvide, dels mellem de hvide og de sorte, med hvilke sidste den pågældende officer plejede social omgang
