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","1091"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Oecologia"],["dc.bibliographiccitation.lastpage","1102"],["dc.bibliographiccitation.volume","163"],["dc.contributor.author","Dulamsuren, Choimaa"],["dc.contributor.author","Hauck, Markus"],["dc.contributor.author","Khishigjargal, Mookhor"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.contributor.author","Leuschner, Christoph"],["dc.date.accessioned","2018-11-07T08:41:01Z"],["dc.date.available","2018-11-07T08:41:01Z"],["dc.date.issued","2010"],["dc.description.abstract","Central and semiarid north-eastern Asia was subject to twentieth century warming far above the global average. Since forests of this region occur at their drought limit, they are particularly vulnerable to climate change. We studied the regional variations of temperature and precipitation trends and their effects on tree growth and forest regeneration in Mongolia. Tree-ring series from more than 2,300 trees of Siberian larch (Larix sibirica) collected in four regions of Mongolia's forest zone were analyzed and related to available weather data. Climate trends underlie a remarkable regional variation leading to contrasting responses of tree growth in taiga forests even within the same mountain system. Within a distance of a few hundred kilometers (140-490 km), areas with recently reduced growth and regeneration of larch alternated with regions where these parameters remained constant or even increased. Reduced productivity could be correlated with increasing summer temperatures and decreasing precipitation; improved growth conditions were found at increasing precipitation, but constant summer temperatures. An effect of increasing winter temperatures on tree-ring width or forest regeneration was not detectable. Since declines of productivity and regeneration are more widespread in the Mongolian taiga than the opposite trend, a net loss of forests is likely to occur in the future, as strong increases in temperature and regionally differing changes in precipitation are predicted for the twenty-first century."],["dc.identifier.doi","10.1007/s00442-010-1689-y"],["dc.identifier.isi","000280083300025"],["dc.identifier.pmid","20571829"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/4995"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19376"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0029-8549"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Diverging climate trends in Mongolian taiga forests influence growth and regeneration of Larix sibirica"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","215"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Trees"],["dc.bibliographiccitation.lastpage","229"],["dc.bibliographiccitation.volume","25"],["dc.contributor.author","Moelder, Inga"],["dc.contributor.author","Leuschner, Christoph"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.date.accessioned","2018-11-07T08:57:51Z"],["dc.date.available","2018-11-07T08:57:51Z"],["dc.date.issued","2011"],["dc.description.abstract","We conducted dendroecological analyses in 80-year-long tree ring chronologies to detect neighborhood effects (competition intensity, species identity) on the delta C-13 signature of tree rings and radial stem increment of Fagus sylvatica trees growing either in monospecific or mixed patches of a temperate forest. We hypothesized that tree ring delta C-13 is a more sensitive indicator of neighborhood effects and the impact of climate variability on growth than is ring width. We found a closer correlation of summer precipitation to delta C-13 than to ring width. While the ring width showed a decline over the test period (1926-2005), the mean curve of delta C-13 increased until the mid of the 1970s, remained high until about 1990, and markedly decreased thereafter. Possible explanations related to ontogeny and environmental change ('age effect' due to canopy closure; elevated atmospheric SO2 concentrations in the 1960s-1980s) are discussed. Beech target trees surrounded by many allospecific trees had a significantly lower mean delta C-13 in the period 1926-1975 than beech with predominantly or exclusively conspecific neighborhood, possibly indicating a more favorable water supply of beech in diverse stands. Contrary to expectation, trees subject to more intense competition by neighboring trees (measured by Hegyi's competition index) had lower delta C-13 values in their tree rings, which is thought to reflect denser canopies being linked to increased shading. We conclude that tree ring delta C-13 time series represent combined archives of climate variability, stand history and neighborhood effects on tree physiology and growth that may add valuable information to that obtained from conventional tree ring analysis."],["dc.identifier.doi","10.1007/s00468-010-0499-5"],["dc.identifier.isi","000288393700007"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6631"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23505"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Heidelberg"],["dc.relation.issn","1432-2285"],["dc.relation.issn","0931-1890"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","delta C-13 signature of tree rings and radial increment of Fagus sylvatica trees as dependent on tree neighborhood and climate"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","275"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Annals of Forest Science"],["dc.bibliographiccitation.lastpage","282"],["dc.bibliographiccitation.volume","68"],["dc.contributor.author","Dulamsuren, Choimaa"],["dc.contributor.author","Hauck, Markus"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.contributor.author","Leuschner, Christoph"],["dc.date.accessioned","2018-11-07T08:58:18Z"],["dc.date.available","2018-11-07T08:58:18Z"],["dc.date.issued","2011"],["dc.description.abstract","Siberian larch (Larix sibirica) has its southern distribution limit in Mongolia in an area of rapidly rising temperatures. Direct effects of climate on tree-ring formation due to drought stress or indirect effects via the control of insect herbivore populations are little studied. The hypotheses were tested that stem increment of Siberian larch is reduced by (1) drought during the growing season and (2) high snow cover, as the latter is thought to protect hibernating herbivores, including gypsy moth (Lymantria dispar). Tree-ring width increases with decreasing summer temperature, increasing precipitation during the growing season and decreasing winter precipitation. The susceptibility of stem wood formation to drought during the growing season suggests that a future climate warming will decrease productivity of Siberian larch, thus affecting its existence within the forest-steppe ecotone of Mongolia. Narrow tree rings in years following winters with low snowfall support the hypothesis that winter precipitation exerts an indirect effect on the growth of Siberian larch by controlling the survival rates of gypsy moth eggs."],["dc.identifier.doi","10.1007/s13595-011-0043-9"],["dc.identifier.isi","000290448000007"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6669"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23610"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1286-4560"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Climate response of tree-ring width in Larix sibirica growing in the drought-stressed forest-steppe ecotone of northern Mongolia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","19"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Interdisciplinaria Archaeologica"],["dc.bibliographiccitation.lastpage","29"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Achterberg, Inke"],["dc.contributor.author","Bauerochse, Andreas"],["dc.contributor.author","Giesecke, Thomas"],["dc.contributor.author","Metzler, Alf"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.date.accessioned","2019-07-10T08:12:04Z"],["dc.date.available","2019-07-10T08:12:04Z"],["dc.date.issued","2015"],["dc.description.abstract","Tree rings provide not only a precise dating tool, but also contain information on environmental change. The well replicated tree ring record of northwest Germany therefore provides environmental implications with immanent, absolute and precise dating from 6703 BC to 931 AD. This offers the opportunity to investigate the environmental context of archaeological finds, if they, too, are dated by dendrochronology. We investigated 13 peat-preserved trackways from the Northwest-German lowland between 4629 BC (Neolithic) and 502 AD (Migration Period) for contemporaneousness with water table rise in the landscape. Such environmental change is well reflected in the clearly notable die-off phases of trees preserved in the mires. As an environmental proxy, the parameter “tree die-off rate a-30” is introduced: The annual number of tree die-off events is divided by the number of live trees 30 years previously. Overall, the majority of trackway constructions were found to be contemporaneous to mire water table rise and mire expansion. Possibly, a period of water table rise was a motivation for trackway construction."],["dc.identifier.doi","10.24916/iansa.2015.1.2"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14522"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60854"],["dc.identifier.url","http://iansa.eu/papers/IANSA-2015-01-achterberg.html"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.relation.doi","10.24916/iansa.2015.1.2"],["dc.relation.issn","2336-1220"],["dc.relation.orgunit","Abteilung Palynologie und Klimadynamik"],["dc.rights","CC BY 4.0"],["dc.rights.access","openAccess"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject","wooden trackways; dendrochronology; mire; environmental change; Holocene climate; Neolithic"],["dc.subject.ddc","570"],["dc.title","Contemporaneousness of Trackway Construction and Environmental Change: a Dendrochronological Study in Northwest-German Mires"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Studia Quaternaria"],["dc.bibliographiccitation.lastpage","18"],["dc.bibliographiccitation.volume","32"],["dc.contributor.author","Shumilovskikh, Lyudmila S."],["dc.contributor.author","Schlütz, Frank"],["dc.contributor.author","Achterberg, Inke"],["dc.contributor.author","Bauerochse, Andreas"],["dc.contributor.author","Leuschner, Hanns Hubert"],["dc.date.accessioned","2019-07-09T11:43:25Z"],["dc.date.available","2019-07-09T11:43:25Z"],["dc.date.issued","2015"],["dc.description.abstract","In order to reconstruct regional vegetation changes and local conditions during the fen-bog transition in the Borsteler Moor (north western Germany), a sediment core covering the period between 7.1 and 4.5 cal kyrs BP was palynologically investigated. The pollen diagram demonstrates the dominance of oak forests and a gradual replacement of trees by raised bog vegetation with the wetter conditions in the Late Atlantic. At ~ 6 cal kyrs BP, the non-pollen palynomorphs (NPP) demonstrate the succession from mesotrophic conditions, clearly indicated by a number of fungal spore types, to oligotrophic conditions, indicated by Sphagnum spores, Bryophytomyces sphagni, and testate amoebae Amphitrema, Assulina and Arcella, etc. Four relatively dry phases during the transition from fen to bog are clearly indicated by the dominance of Calluna and associated fungi as well as by the in crease of microcharcoal. Several new NPP types are described and known NPP types are identified. All NPP are dis cussed in the context of their palaeoecological indicator values."],["dc.identifier.doi","10.1515/squa-2015-0001"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14523"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/58884"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","2300-0384"],["dc.relation.orgunit","Abteilung Palynologie und Klimadynamik"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","570"],["dc.title","Non-Pollen Palynomorphs from Mid-Holocene Peat of the Raised Bog Borsteler Moor (Lower Saxony, Germany)"],["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","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"]]