Leuschner, Hanns Hubert

[["dc.bibliographiccitation.firstpage","231"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","The Holocene"],["dc.bibliographiccitation.lastpage","244"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Eckstein, Jan"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.contributor.author","Giesecke, Thomas"],["dc.contributor.author","Shumilovskikh, Lyudmila S."],["dc.contributor.author","Bauerochse, Andreas"],["dc.date.accessioned","2018-11-07T08:45:27Z"],["dc.date.available","2018-11-07T08:45:27Z"],["dc.date.issued","2010"],["dc.description.abstract","Excellently preserved subfossil pine and oak tree remains from the bottom layer of raised bog peat were dendroecologically investigated at Venner Moor (northwest Germany). Tree-ring analyses were combined with observations of stem and root morphology, preservation state, mineral soil relief, peat stratigraphy and pollen analysis to reconstruct in great detail environmental changes leading to the start of the raised bog formation. Hydrology was identified as the main determinant influencing tree growth and population dynamics at Venner Moor, as documented by different growth patterns and dying-off dates in relation to the mineral soil elevation. The woodland phase has been dendrochronological dated to the period from 2421-2077 BC (4371-4027 cal BP). In this period, a general change from more or less open landscape with dominating heath to wet pine forest and eventually to open raised bog occurred at the site. Comparisons with pine population dynamics at the nearby Voerdener Moor and with the independent Lower Saxony log yak Chronology (LSBOC) indicate that the reconstructed ecological changes at Venner Moor are mainly triggered by climate variations, in particular wet shifts on the decadal timescale. This example shows the value of subfossil pine layers from northwest German bogs as a high resolution proxy archive of Holocene humidity fluctuations."],["dc.description.sponsorship","German Research Foundation [LE 1805/2-1]"],["dc.identifier.doi","10.1177/0959683609350397"],["dc.identifier.isi","000274900800008"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13085"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/20445"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0959-6836"],["dc.relation.orgunit","Abteilung Palynologie und Klimadynamik"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Dendroecological investigations at Venner Moor (northwest Germany) document climate-driven woodland dynamics and mire development in the period 2450-2050 BC"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","129"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Dendrochronologia"],["dc.bibliographiccitation.lastpage","146"],["dc.bibliographiccitation.volume","27"],["dc.contributor.author","Eckstein, Jan"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.contributor.author","Bauerochse, Andreas"],["dc.contributor.author","Sass-Klaassen, Ute"],["dc.date.accessioned","2018-11-07T08:34:22Z"],["dc.date.available","2018-11-07T08:34:22Z"],["dc.date.issued","2009"],["dc.description.abstract","Extended dendrochronological investigations were performed on subfossil pine entombed in peat layers of former bogs in Lower Saxony (NW Germany). The aim was to study of dynamics in bog development in response to local environmental conditions and regional changes in climate throughout the Holocene. To date, 1702 samples have been collected from 36 locations. Crossdating with the Lower Saxony Bog Oak Chronology (LSBOC) resulted in five absolutely dated pine chronologies covering large parts of the period from 5600 BC to 2200 BC. Radiocarbon dating of eight additional chronologies extends this time-span from 7000 BC to 1500 BC. By combining dendrochronology with information on stratigraphic position as well as stem and root morphology we found that major changes in site hydrology cause changes in growth pattern and population dynamics of subfossil pine whereas storm and fire were of minor importance. The fact that shifts in growth patterns and population dynamics occurred simultaneously in trees from different sites indicates regional climate changes as main drivers of pines forest development in peatland ecosystems. (C) 2009 Elsevier GmbH. All rights reserved."],["dc.identifier.doi","10.1016/j.dendro.2009.06.007"],["dc.identifier.isi","000270017500006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17794"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Gmbh, Urban & Fischer Verlag"],["dc.relation.conference","14th EuroDendro 2008"],["dc.relation.eventlocation","Hallstatt, AUSTRIA"],["dc.relation.issn","1125-7865"],["dc.title","Subfossil bog-pine horizons document climate and ecosystem changes during the Mid-Holocene"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","781"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Journal of Vegetation Science"],["dc.bibliographiccitation.lastpage","794"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Eckstein, Jan"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.contributor.author","Bauerochse, Andreas"],["dc.date.accessioned","2018-11-07T08:51:33Z"],["dc.date.available","2018-11-07T08:51:33Z"],["dc.date.issued","2011"],["dc.description.abstract","Questionc Can investigations of subfossil bog-pine woodlands contribute to the understanding of mire development, especially the influence of climate fluctuations on the fen-bog transition? Location: Lowlands of northwest Germany. Methods: We investigated pine (Pinus sylvestris L.) tree remains (stumps and trunks) buried in peat deposits. Dendrochronology was used to date each sampled tree to calendar years and to reconstruct population dynamics of the pine woodlands. Ecological changes, especially changes in site hydrology during the pine woodland phases were inferred from peat stratigraphic analyses and investigations of stem and root morphology of the tree remains. Results: The subfossil pine woodlands occurred mostly during the transition from fen to raised bog conditions within the mire development. The population dynamics are strikingly wave-like whereas woodland phases of 100 to 250 years duration are separated by much shorter (10-50 years) phases of high germination and dying-off rates (GDO phases). Such GDO phases are often synchronous at different sites and are also linked to growth depressions of the independent regional oak master chronology (LSBOC), indicating a climate trigger. Conclusions: The development of raised bogs started about 7000 BC and had a main phase between 5100 and 3600 BC in northwest Germany. The subfossil bog-pine woodlands document the transitional phase towards the onset of raised bog formation, as characterized by initial dry conditions that were followed by increasing wetness of the sites, whereas this development is at least partly the result of climate variations."],["dc.description.sponsorship","German Research Foundation [LE 1805/2-1]"],["dc.identifier.doi","10.1111/j.1654-1103.2011.01283.x"],["dc.identifier.isi","000294561200003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21959"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1100-9233"],["dc.title","Mid-Holocene pine woodland phases and mire development - significance of dendroecological data from subfossil trees from northwest Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","85"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Climate of the Past"],["dc.bibliographiccitation.lastpage","100"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Achterberg, Inke Elisabeth Maike"],["dc.contributor.author","Eckstein, Jan"],["dc.contributor.author","Birkholz, Bernhard"],["dc.contributor.author","Bauerochse, Andreas"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.date.accessioned","2018-06-19T13:34:06Z"],["dc.date.available","2018-06-19T13:34:06Z"],["dc.date.issued","2018"],["dc.description.abstract","The investigated northwest German mire site at \"Totes Moor\" is densely covered with subfossil pine stumps (Pinus sylvestris L.) from the fen–bog transition. This facilitates the spatio-temporal reconstruction of mire development, which is based on 212 in situ tree stumps in the case study presented here. Six dendrochronologically dated site chronologies together cover 2345 years between 6703 and 3403 BC. The gaps in between are 6 to 550 years long. Additionally, a floating chronology of 309 years, containing 30 trees, was radiocarbon-dated to the beginning of the 7th millennium cal BC. Peat-stratigraphical survey was carried out additionally, and elevations a.s.l. were determined at several locations. Tree dying-off phases, which indicate water level rise at the site, mostly in context of the local fen–bog transition, are evident for ca. 6600–6450, ca. 6350–5750, ca. 5300–4900, ca. 4700–4550, ca. 3900–3850, ca. 3700–3600, ca. 3500–3450 and ca. 3400 BC. The spatial distribution of the dated in situ trees illustrates the phase-wise expansion of raised bog over fen peat at the site. The documented bog expansion pulses likely correspond to climatic wet sifts."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2018"],["dc.identifier.doi","10.5194/cp-14-85-2018"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15189"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15121"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation.orgunit","Abteilung Palynologie und Klimadynamik"],["dc.rights","CC BY 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/3.0"],["dc.title","Dendrochronologically dated pine stumps document phase-wise bog expansion at a northwest German site between ca. 6700 and ca. 3400 BC"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","9"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Zeitschrift der Deutschen Gesellschaft für Geowissenschaften"],["dc.bibliographiccitation.lastpage","19"],["dc.bibliographiccitation.volume","168"],["dc.contributor.author","Achterberg, Inke"],["dc.contributor.author","Frechen, Manfred"],["dc.contributor.author","Bauerochse, Andreas"],["dc.contributor.author","Eckstein, Jan"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.date.accessioned","2018-11-07T10:26:50Z"],["dc.date.available","2018-11-07T10:26:50Z"],["dc.date.issued","2017"],["dc.description.abstract","To date, the tree-ring chronology of peat-preserved pines from Northwest Germany (Fig. 1) spans from 6703 BC to 1166 BC, but still contains two gaps. It was dated with the help of the previously constructed bog-oak chronology of Northwest Germany, the older part of which in turn has been dated using the pine chronology (Fig. 2), now covering from 6628 to 6178 BC additional to the previous span of 6069 BC to 931 AD. Compared to the oaks, chronology construction required large numbers of samples of the short-lived pine trees, many of which remained undated or dated relatively only. The dendrochronological process, which at times delivered a multitude of floating chronology fragments, was complemented by a number of radiocarbon dates. Preceding and following the calendar-dated pine chronology, there are radiocarbon dated floating chronologies. This pine record partly dates back to the beginning of the 9th millennium BC and documents environmental conditions during the early Holocene. It also shows the potential of the chronology to be extended further into the past. The Northwest German pine chronology has since been the base for dating i.a. archaeological finds, such as Neolithic wooden bog trackways. Moreover, the peat-preserved pines have proved to be valuable in palaeoenvironmental research, as they grew at sites where they were sensitive to hydrological changes. Particularly the climate-related advances of raised bog are well reflected in the material."],["dc.description.sponsorship","German Research Foundation DFG [LE 1805/1-2, FR877/16-1, HA4438/1]"],["dc.identifier.doi","10.1127/zdgg/2016/0042"],["dc.identifier.isi","000397029000003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43126"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","1860-1804"],["dc.relation.orgunit","Abteilung Palynologie und Klimadynamik"],["dc.title","The Gottingen tree-ring chronologies of peat-preserved oaks and pines from Northwest Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]