Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Quelle der Hochschulschrift Konferenzname Quelle:Titel Quelle:Jahrgang Quelle:Heftnummer Quelle:Erste Seite Quelle:Letzte Seite URN DOI Abteilungen OPUS4-51955 Wissenschaftlicher Artikel Pauly, Maren; Helle, Gerhard; Miramont, Cecile; Buentgen, Ulf; Treydte, Kerstin; Reinig, Frederick; Guibal, Frederic; Sivan, Olivier; Heinrich, Ingo; Riedel, Frank; Kromer, Bernd; Balanzategui, Daniel; Wacker, Lukas; Sookdeo, Adam; Brauer, Achim Subfossil trees suggest enhanced Mediterranean hydroclimate variability at the onset of the Younger Dryas Nearly 13,000 years ago, the warming trend into the Holocene was sharply interrupted by a reversal to near glacial conditions. Climatic causes and ecological consequences of the Younger Dryas (YD) have been extensively studied, however proxy archives from the Mediterranean basin capturing this period are scarce and do not provide annual resolution. Here, we report a hydroclimatic reconstruction from stable isotopes (delta O-18, delta C-13) in subfossil pines from southern France. Growing before and during the transition period into the YD (12 900-12 600 cal BP), the trees provide an annually resolved, continuous sequence of atmospheric change. Isotopic signature of tree sourcewater (delta O-18(sw)) and estimates of relative air humidity were reconstructed as a proxy for variations in air mass origin and precipitation regime. We find a distinct increase in inter-annual variability of sourcewater isotopes (delta O-18(sw)), with three major downturn phases of increasing magnitude beginning at 12 740 cal BP. The observed variation most likely results from an amplified intensity of North Atlantic (low delta O-18(sw)) versus Mediterranean (high delta O-18(sw)) precipitation. This marked pattern of climate variability is not seen in records from higher latitudes and is likely a consequence of atmospheric circulation oscillations at the margin of the southward moving polar front. London Nature Publ. Group 2018 8 Scientific reports 8 10.1038/s41598-018-32251-2 Institut für Geowissenschaften OPUS4-52533 Wissenschaftlicher Artikel Kaiser, Knut; Oldorff, Silke; Breitbach, Carsten; Kappler, Christoph; Theuerkauf, Martin; Scharnweber, Tobias; Schult, Manuela; Kuester, Mathias; Engelhardt, Christof; Heinrich, Ingo; Hupfer, Michael; Schwalbe, Grit; Kirschey, Tom; Bens, Oliver A submerged pine forest from the early Holocene in the Mecklenburg Lake District, northern Germany For the first time, evidence of a submerged pine forest from the early Holocene can be documented in a central European lake. Subaquatic tree stumps were discovered in Lake Giesenschlagsee at a depth of between 2 and 5m using scuba divers, side-scan sonar and a remotely operated vehicle. Several erect stumps, anchored to the ground by roots, represent an insitu record of this former forest. Botanical determination revealed the stumps to be Scots pine (Pinus sylvestris) with an individual tree age of about 80years. The trees could not be dated by means of dendrochronology, as they are older than the regional reference chronology for pine. Radiocarbon ages from the wood range from 10880 +/- 210 to 10370 +/- 130cal. a BP, which is equivalent to the mid-Preboreal to early Boreal biozones. The trees are rooted in sedge peat, which can be dated to this period as well, using pollen stratigraphical analysis. Tilting of the peat bed by 4m indicates subsidence of the ground due to local dead ice melting, causing the trees to become submerged and preserved for millennia. Together with recently detected Lateglacial insitu tree occurrences in nearby lakes, the submerged pine forest at Giesenschlagsee represents a new and highly promising type of geo-bio-archive for the wider region. Comparable insitu pine remnants occur at some terrestrial (buried setting) and marine (submerged setting) sites in northern central Europe and beyond, but they partly differ in age. In general, the insitu pine finds document shifts of the zonal boreal forest ecosystem during the late Quaternary. Hoboken Wiley 2018 16 Boreas 47 3 910 925 10.1111/bor.12314 Institut für Geowissenschaften OPUS4-45916 misc Pauly, Maren; Helle, Gerhard; Miramont, Cécile; Büntgen, Ulf; Treydte, Kerstin; Reinig, Frederick; Guibal, Frédéric; Sivan, Olivier; Heinrich, Ingo; Riedel, Frank; Kromer, Bernd; Balanzategui, Daniel; Wacker, Lukas; Sookdeo, Adam Sookdeo; Brauer, Achim Subfossil trees suggest enhanced Mediterranean hydroclimate variability at the onset of the Younger Dryas Nearly 13,000 years ago, the warming trend into the Holocene was sharply interrupted by a reversal to near glacial conditions. Climatic causes and ecological consequences of the Younger Dryas (YD) have been extensively studied, however proxy archives from the Mediterranean basin capturing this period are scarce and do not provide annual resolution. Here, we report a hydroclimatic reconstruction from stable isotopes (delta O-18, delta C-13) in subfossil pines from southern France. Growing before and during the transition period into the YD (12 900-12 600 cal BP), the trees provide an annually resolved, continuous sequence of atmospheric change. Isotopic signature of tree sourcewater (delta O-18(sw)) and estimates of relative air humidity were reconstructed as a proxy for variations in air mass origin and precipitation regime. We find a distinct increase in inter-annual variability of sourcewater isotopes (delta O-18(sw)), with three major downturn phases of increasing magnitude beginning at 12 740 cal BP. The observed variation most likely results from an amplified intensity of North Atlantic (low delta O-18(sw)) versus Mediterranean (high delta O-18(sw)) precipitation. This marked pattern of climate variability is not seen in records from higher latitudes and is likely a consequence of atmospheric circulation oscillations at the margin of the southward moving polar front. 2018 10 Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe 1135 urn:nbn:de:kobv:517-opus4-459169 10.25932/publishup-45916 Mathematisch-Naturwissenschaftliche Fakultät OPUS4-34822 Wissenschaftlicher Artikel Liang, Wei; Heinrich, Ingo; Simard, Sonia; Helle, Gerhard; Linan, Isabel Dorado; Heinken, Thilo Climate signals derived from cell anatomy of Scots pine in NE Germany Tree-ring chronologies of Pinus sylvestris L. from latitudinal and altitudinal limits of the species distribution have been widely used for climate reconstructions, but there are many sites within the temperate climate zone, as is the case in northeastern Germany, at which there is little evidence of a clear climate signal in the chronologies. In this study, we developed long chronologies of several cell structure variables (e. g., average lumen area and cell wall thickness) from P. sylvestris growing in northeastern Germany and investigated the influence of climate on ring widths and cell structure variables. We found significant correlations between cell structure variables and temperature, and between tree-ring width and relative humidity and vapor pressure, respectively, enabling the development of robust reconstructions from temperate sites that have not yet been realized. Moreover, it has been shown that it may not be necessary to detrend chronologies of cell structure variables and thus low-frequency climate signals may be retrieved from longer cell structure chronologies. The relatively extensive resource of archaeological material of P. sylvestris covering approximately the last millennium may now be useful for climate reconstructions in northeastern Germany and other sites in the temperate climate zone. Oxford Oxford Univ. Press 2013 12 Tree physiology 33 8 833 844 10.1093/treephys/tpt059 Institut für Biochemie und Biologie OPUS4-35347 Wissenschaftlicher Artikel Liang, Wei; Heinrich, Ingo; Helle, Gerhard; Linan, Isabel Dorado; Heinken, Thilo Applying CLSM to increment core surfaces for histometric analyses a novel advance in quantitative wood anatomy A novel procedure has been developed to conduct cell structure measurements on increment core samples of conifers. The procedure combines readily available hardware and software equipment. The essential part of the procedure is the application of a confocal laser scanning microscope (CLSM) which captures images directly from increment cores surfaced with the advanced WSL core-microtome. Cell wall and lumen are displayed with a strong contrast due to the monochrome black and green nature of the images. Consecutive images are merged into long images representing entire increment cores which are then analysed for cell structures in suitable software. Jena Elsevier 2013 6 Dendrochronologia : an interdisciplinary journal of tree-ring science 31 2 140 145 10.1016/j.dendro.2012.09.002 Institut für Biochemie und Biologie OPUS4-40794 misc Siegmund, Jonatan Frederik; Sanders, Tanja G. M.; Heinrich, Ingo; Maaten, Ernst van der; Simard, Sonia; Helle, Gerhard; Donner, Reik Volker Meteorological drivers of extremes in daily stem radius variations of beech, oak, and pine in Northeastern Germany Observed recent and expected future increases in frequency and intensity of climatic extremes in central Europe may pose critical challenges for domestic tree species. Continuous dendrometer recordings provide a valuable source of information on tree stem radius variations, offering the possibility to study a tree's response to environmental influences at a high temporal resolution. In this study, we analyze stem radius variations (SRV) of three domestic tree species (beech, oak, and pine) from 2012 to 2014. We use the novel statistical approach of event coincidence analysis (ECA) to investigate the simultaneous occurrence of extreme daily weather conditions and extreme SRVs, where extremes are defined with respect to the common values at a given phase of the annual growth period. Besides defining extreme events based on individual meteorological variables, we additionally introduce conditional and joint ECA as new multivariate extensions of the original methodology and apply them for testing 105 different combinations of variables regarding their impact on SRV extremes. Our results reveal a strong susceptibility of all three species to the extremes of several meteorological variables. Yet, the inter-species differences regarding their response to the meteorological extremes are comparatively low. The obtained results provide a thorough extension of previous correlation-based studies by emphasizing on the timings of climatic extremes only. We suggest that the employed methodological approach should be further promoted in forest research regarding the investigation of tree responses to changing environmental conditions. 2016 14 Frontiers in plant science urn:nbn:de:kobv:517-opus4-407943 Mathematisch-Naturwissenschaftliche Fakultät OPUS4-45234 Wissenschaftlicher Artikel Siegmund, Jonatan F.; Sanders, Tanja G. M.; Heinrich, Ingo; van der Maaten, Ernst; Simard, Sonia; Helle, Gerhard; Donner, Reik Volker Meteorological Drivers of Extremes in Daily Stem Radius Variations of Beech, Oak, and Pine in Northeastern Germany: An Event Coincidence Analysis Observed recent and expected future increases in frequency and intensity of climatic extremes in central Europe may pose critical challenges for domestic tree species. Continuous dendrometer recordings provide a valuable source of information on tree stem radius variations, offering the possibility to study a tree's response to environmental influences at a high temporal resolution. In this study, we analyze stem radius variations (SRV) of three domestic tree species (beech, oak, and pine) from 2012 to 2014. We use the novel statistical approach of event coincidence analysis (ECA) to investigate the simultaneous occurrence of extreme daily weather conditions and extreme SRVs, where extremes are defined with respect to the common values at a given phase of the annual growth period. Besides defining extreme events based on individual meteorological variables, we additionally introduce conditional and joint ECA as new multivariate extensions of the original methodology and apply them for testing 105 different combinations of variables regarding their impact on SRV extremes. Our results reveal a strong susceptibility of all three species to the extremes of several meteorological variables. Yet, the inter-species differences regarding their response to the meteorological extremes are comparatively low. The obtained results provide a thorough extension of previous correlation-based studies by emphasizing on the timings of climatic extremes only. We suggest that the employed methodological approach should be further promoted in forest research regarding the investigation of tree responses to changing environmental conditions. Lausanne Frontiers Research Foundation 2016 14 Frontiers in plant science 7 4701 4712 10.3389/fpls.2016.00733 Institut für Geowissenschaften OPUS4-55848 Wissenschaftlicher Artikel Wieczorek, Mareike; Kolmogorov, Alexei; Kruse, Stefan; Jacobsen, Inga; Nitze, Ingmar; Nikolaev, Anatoly N.; Heinrich, Ingo; Pestryakova, Luidmila Agafyevna; Herzschuh, Ulrike Disturbance-effects on treeline larch-stands in the lower Kolyma River area (NE Siberia) Tree stands in the boreal treeline ecotone are, in addition to climate change, impacted by disturbances such as fire, water-related disturbances and logging. We aim to understand how these disturbances affect growth, age structure, and spatial patterns of larch stands in the north-eastern Siberian treeline ecotone (lower Kolyma River region), an insufficiently researched region. Stand structure of Larix cajanderi Mayr was studied at seven sites impacted by disturbances. Maximum tree age ranged from 44 to 300 years. Young to medium-aged stands had, independent of disturbance type, the highest stand densities with over 4000 larch trees per ha. These sites also had the highest growth rates for tree height and stem diameter. Overall lowest stand densities were found in a polygonal field at the northern end of the study area, with larches growing in distinct " tree islands". At all sites, saplings are significantly clustered. Differences in fire severity led to contrasting stand structures with respect to tree, recruit, and overall stand densities. While a low severity fire resulted in low-density stands with high proportions of small and young larches, high severity fires resulted in high-density stands with high proportions of big trees. At waterdisturbed sites, stand structure varied between waterlogged and drained sites and latitude. These mixed effects of climate and disturbance make it difficult to predict future stand characteristics and the treeline position. Helsinki The Finnish Society of Forest Science 2017 20 Silva Fennica : a quarterly journal for forest science 51 3 10.14214/sf.1666 Institut für Geowissenschaften OPUS4-46398 Wissenschaftlicher Artikel Wieczorek, Mareike; Kruse, Stefan; Epp, Laura Saskia; Kolmogorov, Alexei; Nikolaev, Anatoly N.; Heinrich, Ingo; Jeltsch, Florian; Pestryakova, Luidmila Agafyevna; Zibulski, Romy; Herzschuh, Ulrike Dissimilar responses of larch stands in northern Siberia to increasing temperatures-a field and simulation based study Arctic and alpine treelines worldwide differ in their reactions to climate change. A northward advance of or densification within the treeline ecotone will likely influence climate-vegetation feedback mechanisms. In our study, which was conducted in the Taimyr Depression in the North Siberian Lowlands, w present a combined field-and model-based approach helping us to better understand the population processes involved in the responses of the whole treeline ecotone, spanning from closed forest to single-tree tundra, to climate warming. Using information on stand structure, tree age, and seed quality and quantity from seven sites, we investigate effects of intra-specific competition and seed availability on the specific impact of recent climate warming on larch stands. Field data show that tree density is highest in the forest-tundra, and average tree size decreases from closed forest to single-tree tundra. Age-structure analyses indicate that the trees in the closed forest and forest-tundra have been present for at least similar to 240 yr. At all sites except the most southerly ones, past establishment is positively correlated with regional temperature increase. In the single-tree tundra, however, a change in growth form from krummholz to erect trees, beginning similar to 130 yr ago, rather than establishment date has been recorded. Seed mass decreases from south to north, while seed quantity increases. Simulations with LAVESI (Larix Vegetation Simulator) further suggest that relative density changes strongly in response to a warming signal in the forest-tundra while intra-specific competition limits densification in the closed forest and seed limitation hinders densification in the single-tree tundra. We find striking differences in strength and timing of responses to recent climate warming. While forest-tundra stands recently densified, recruitment is almost non-existent at the southern and northern end of the ecotone due to autecological processes. Palaeo-treelines may therefore be inappropriate to infer past temperature changes at a fine scale. Moreover, a lagged treeline response to past warming will, via feedback mechanisms, influence climate change in the future. Hoboken Wiley 2017 13 Ecology : a publication of the Ecological Society of America 98 2343 2355 10.1002/ecy.1887 Institut für Biochemie und Biologie OPUS4-48647 Wissenschaftlicher Artikel Heinrich, Ingo; Balanzategui, Daniel; Bens, Oliver; Blasch, Gerald; Blume, Theresa; Boettcher, Falk; Borg, Erik; Brademann, Brian; Brauer, Achim; Conrad, Christopher; Dietze, Elisabeth; Dräger, Nadine; Fiener, Peter; Gerke, Horst H.; Güntner, Andreas; Heine, Iris; Helle, Gerhard; Herbrich, Marcus; Harfenmeister, Katharina; Heussner, Karl-Uwe; Hohmann, Christian; Itzerott, Sibylle; Jurasinski, Gerald; Kaiser, Knut; Kappler, Christoph; Koebsch, Franziska; Liebner, Susanne; Lischeid, Gunnar; Merz, Bruno; Missling, Klaus Dieter; Morgner, Markus; Pinkerneil, Sylvia; Plessen, Birgit; Raab, Thomas; Ruhtz, Thomas; Sachs, Torsten; Sommer, Michael; Spengler, Daniel; Stender, Vivien; Stüve, Peter; Wilken, Florian Interdisciplinary Geo-ecological Research across Time Scales in the Northeast German Lowland Observatory (TERENO-NE) The Northeast German Lowland Observatory (TERENO-NE) was established to investigate the regional impact of climate and land use change. TERENO-NE focuses on the Northeast German lowlands, for which a high vulnerability has been determined due to increasing temperatures and decreasing amounts of precipitation projected for the coming decades. To facilitate in-depth evaluations of the effects of climate and land use changes and to separate the effects of natural and anthropogenic drivers in the region, six sites were chosen for comprehensive monitoring. In addition, at selected sites, geoarchives were used to substantially extend the instrumental records back in time. It is this combination of diverse disciplines working across different time scales that makes the observatory TERENO-NE a unique observation platform. We provide information about the general characteristics of the observatory and its six monitoring sites and present examples of interdisciplinary research activities at some of these sites. We also illustrate how monitoring improves process understanding, how remote sensing techniques are fine-tuned by the most comprehensive ground-truthing site DEMMIN, how soil erosion dynamics have evolved, how greenhouse gas monitoring of rewetted peatlands can reveal unexpected mechanisms, and how proxy data provides a long-term perspective of current ongoing changes. Madison Soil Science Society of America 2018 25 Vadose zone journal 17 1 10.2136/vzj2018.06.0116 Institut für Geowissenschaften