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AG Biogeographie und Dendrowissenschaften (Bräuning)

In der AG Biogeographie und Dendrowissenschaften befassen wir uns mit allen Aspekten der Dendrowissenschaften. Unsere Forschung konzentriert sich international auf Asien, Europa, Afrika und Südamerika.

Prof. Dr. Achim Bräuning

  • Dendrolabor
  • Isotopenlabor

Labore

Dendrolabor – das Dendrolabor bietet Möglichkeiten zur Präparation von Holzproben, Messung von Jahrringbreiten und der Analyse von holzanatomischen Parametern.

Isotopenlabor – Wissenschaftliche Schwerpunkte unserer Forschung sind hochauflösende Klimarekonstruktionen mit Baumringen und Seesedimenten. Darüber hinaus werden Analysen stabiler Isotope zur Bearbeitung pflanzenökologischer und umweltrelevanter Fragestellungen in Bezug auf Stoffkreisläufe, Nahrungsnetze und Ozeanographie eingesetzt.

Gastwissenschaftler

  • Mohsen Arsalani
  • Elham Elzami
  • Zeynab Foroozan
  • Dr. Minhui He
  • Ru Huang
  • Mahmuda Islam
  • Mizanur Rahman
  • Modellierung des Wasserhaushaltes an trockenen Waldstandorten in Nordbayern
  • Klimatologische Steuerung holzanatomischer Parameter an Buchen in Nordbayern
  • Auswirkungen des Trockensommers 2015 auf Birken (Betula pendula) im mittelfränkischen Trockengebiet
  • Untersuchungen zur räumlichen Variabilität von Isotopenvariationen im Holz von Cedrela montana in Bergregenwäldern Südecuadors (GIS- bzw. Modellierungsarbeit)
  • Holzanatomische Parameter als Indikatoren in ecuadorianischen Regenwäldern
  • Isotopenphysikalische Untersuchungen an Nadelhölzern aus historischen Turm- und Tempelbauten Hochtibets zur Bestimmung klimatologischer Extremereignisse
  • Analyse von Klimatrends des 20. Jahrhunderts anhand von isotopenphysikalischen Untersuchungen an waldgrenznahen Nadelhölzern des zentralen Himalaya
  • Holzanatomische Parameter als Indikatoren von Klimaänderungen im Nepal-Himalaya
  • Holzanatomische Parameter als Indikatoren in korsischen Gebirgswäldern
  • Untersuchungen zur räumlichen Variabilität von Wachstumsschwankungen der Eibe (Taxus baccata) in Südnorwegen.
  • Berechnung eines klimatischen Höhengradienten im Alborz-Gebirge
  • Einfluss der Mikrotopographie auf die Isotopenvariationen und den Wasserhaushalt alpiner Zwergsträucher
  • Entwicklung einer objektrelationalen Datenbankstruktur für Jahrringdaten (Nebenfach Informatik von Vorteil)

High Asia

The mountain regions of High Asia are a long-term key research area of the Erlangen Tree-Ring Lab. Study regions include the Tibetan plateau, west Chinese mountain areas (Provinces Yunnan, Sichuan), and the Nepalese and Indian Himalaya. Important topics include the reconstruction of the variability of major atmospheric circulation patterns like the Asian Summer Monsoon System and the Westerlies, and related changes in landscape and hydroclimate.

Specifically, glacier fluctuations and their underlying climatological causes and plant ecological responses to changes in the monsoon dynamics along elevation gradients are among the main research topics. Related research projects were realized in the framework of international collaborations with local partner institutions in China, Nepal, Iran and India.

gefördert durch die

Funding period: 2011-2014

Project team

Prof. Dr. Achim Bräuning, Dr. Jussi Grießinger, Akad. Rat, Dr. Philipp Hochreuther

Monsoonal temperate glaciers in southeastern Tibet react fast and sensitive on climate changes. We combine geomorphological and sedimentological data from glacier sediments to reconstruct glacier fluctuations and equilibrium-line altitude variations. Within our project, we aim to

  • date Little Ice Age glacier advances and to reconstruct different seasonal climatic elements by using different wood parameters like ring width, maximum latewood density and the content of stable δ13C and δ18O isotopes.
  • reconstruct former moisture and temperature conditions during important late Holocene-climate episodes like the Little Ice Age and the Medieval Warm Period by using glacier and tree-ring data
  • combine temperature-sensitive and moisture-sensitive palaeoclimate proxies to disentangle the role of temperature and humidity changes for the behaviour of monsoonal temperate glaciers on the southeastern Tibetan plateau.

Project website

TiP (www.tip.uni-tuebingen.de)

Project partners

  • Department of Geography, RWTH Aachen University
  • Institute for Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China

Funding period: 2012-2015

Project team

Prof. Dr. Achim Bräuning, Dr. Jussi Grießinger, Akad. Rat, Jakob Wernicke

The combined project targets the late Holocene climate- and landscape dynamics in East Tibet and the eastern Himalayas, which are influenced by the Bengal branch of the southeast Asian (Indian) summer monsoon. The targeted archives contain tree-ring series of living, historic and sub-fossil trees as well as soils and soil sediments. The research areas involve on the one hand sites south of the main Himalayan ridge (Subproject 4) as well as northern regions of SE Tibet in the rain shadow of the Himalayas (subprojects 1-3). Subproject 2 contributes the ecophysiological process understanding of the isotopic fractionation of trees at monsoonal high mountain sites and thus increases the interpretation basics for the reconstruction of monsoon variability using tree-ring chronologies. The palaeoclimatic findings are calibrated using modelled hydroclimate scenarios. The late Holocene monsoon variations, as well as possible future changes of the southwest Asian monsoon system are modelled using alternative scenarios (subproject 5).

Project website

CLASH (http://zentralasien.senckenberg.de/)

Project partners

  • Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF), Institut für Landschaftsbiogeochemie
  • Universität Hamburg, Institut für Geographie
  • GIS Service GmbH Wackernheim

2016

  • Bräuning, A., Grießinger, J., Hochreuther, P. & Wernicke, J. (2016): Dendroecological perspectives on climate change on the southern Tibetan plateau. In: Singh, E.D., Schickhoff, U. & Mal, S. (Eds.) (2016): Dynamics of Climate, Glaciers and Vegetation in the Himalaya: Contributions towards future Earth initiatives. Springer (in press)
  • Spannl, S., Bräuning, A. (2016): Standard or modern techniques? Combination of common microscopic techniques and X-ray microtomography for wood anatomical analyses. TRACE 14, accepted
  • Meinardus, C., Quack, K., Raffelsbauer, V., Bräuning, A. (2016): Ring width and vessel lumen area of Fagus sylvatica in years with spring and summer drought. TRACE 14, accepted.
  • Bräuning, A., De Ridder, M., Zafirov, N., García-González, I., Dimitrov, D., Gärtner, H. (2016): Tree-ring features – indicators of extreme event impacts. IAWA Journal (accepted)
  • Speer, J.H., Bräuning, A., Zhang, Q.B., Pourtahmasi, K.,Gairee, N.P., Dawadi, B., Rana, P., Dhakal, Y.R., Acharya, R.H., Adhikari, D.L., Adhikari, S., Aryal, P.C., Bagale, D., Baniya, B., Bhandari, S., Dahal, N., Dahal, S., Ganbaatar, N., Giri, A., Gurung, D.B, Khandu,Y.,  Maharjan, B., Maharjan, R., Malik, R.A., Nath, C.D., Nepal, B., Ngoma, J., Pant, R., Pathak, M.L., Paudel, H., Sharma, B., Hossain, Md Sarwar, Soronzonbold, B., Swe, T., Thapa, I., Tiwari, A. (2016): Pinus roxburghii stand dynamics at a heavily impacted site in Nepal:Research through an educational fieldweek. Dendrochronoloiga, doi.org/10.1016/j.dendro.2016.01.005.
  • Bräuning, A., Steppe, K. (2016): Editorial note for the special issue on ‘Sap flow and hydraulic functioning’ of TREES: structure and function. Trees 30:1–3. DOI 10.1007/s00468-015-1346-5.
  • Grießinger, J., Helle, G., Hochreuther, P., Schleser, G.H., Bräuning, A., (2016): Millennial-long reconstruction of growing-season humidity on the eastern Tibetan plateau. Quaternary International (accepted).
  • Volland, F., Pucha, D., Bräuning, A. (2016): Hydro-climatic variability in Southern Ecuador from tree-ring oxygen isotopes. Erdkunde. accepted.
  • Spannl, S., Volland, F., Pucha, D., Peters, T., Bräuning, A. (2016): Climate variability, tree increment patterns and ENSO-related carbon sequestration reduction of the tropical dry forest species Loxopterygium huasango of Southern Ecuador. TREES. accepted.
  • De Micco, V., Campelo, F., De Luis, M., Grabner, M., Battipaglia, G., Bräuning, A., Cherubini, P. (2016): Formation of Intra-Annual-Density-Fluctuations in tree rings: how, when, where and why? IAWA Journal, accepted.
  • Hiltner, U., Bräuning, A., Gebrekirstos, A., Fischer, R., Huth, A. (2016): Impacts of precipitation variability on the dynamics of a dry tropical montane forest (Munessa-Shashemene Forest, Ethiopia). Ecological Modelling 320, 92-101.

2015

  • Nadi,  M., Bazrafshan, J., Pourtahmasi, K., Bräuning, A. (2015): 190 Years Reconstruction of Drought Periods Based on Tree-Ring Width and Joint Deficit Index (JDI) in Javan-Roud Region, Kermanshah (Iran). Journal of Hydrological Engeneering, accepted.
  • Wernicke, J., Hochreuther, P., Grießinger, J., Zhu, H., Wang, L., Bräuning, A. (2015): Hydroclimatic variability of East Tibet in perspective to the last millennium hydrological history of the Tibetan Plateau. TRACE 13: 42-48.
  • Hochreuther, P., Loibl, D., Wernicke, J., Grießinger, J., Zhu, H., Bräuning, A. (2015): Tree stands on lateral and terminal Little Ice Age moraines of four glaciers in southeast Tibet. TRACE 13: 116-122
  • He, M. Yang, B., Wang, Z., Bräuning, A., Pourtahmasi, K. Oladi, R. (2015): Climate forcing of xylem formation in Qilian juniper on the northeastern Tibetan Plateau. Trees. DOI 10.1007/s00468-015-1333-x.
  • Foroozan, Z., Pourtahmasi, K., Bräuning, A. (2015): Stable oxygen isotopes in juniper and oak tree rings from northern Iran as indicators for site-specific and season-specific moisture variations. Dendrochronologia 36: 33-39. doi:10.1016/j.dendro.2015.08.003.
  • Pucha Cofrep, D., Peters, T., Bräuning, A. (2015): Wet season precipitation during the past 120 years reconstructed from tree rings of a tropical dry forest in Southern Ecuador. Global and Planetary Change. 133: 65–78.
  • Gessesse, B., Bewket, W., Bräuning, A. (2015): Determinants of farmers’ tree planting investment decision as a degraded landscape management strategy in the central highlands of Ethiopia. Solid Earth Discuss., 7, 3245–3270, 2015. doi:10.5194/sed-7-3245-2015
  • Gessesse, B., Bewket, W., Bräuning, A. (2015): Model-based characterization and monitoring of runoff and soil erosion in response to land use/land cover changes in the Modjo watershed, Ethiopia. Land Degradation and Development 26: 711-724.
  • Gessesse, B., Bewket, W., Bräuning, A.: (2015): Why does accuracy assessment and validation of multi-resolution-based satellite image classification matters? a methodological discourse. SINET: Ethiopian Journal of Sciences, accepted.
  • Mokria, M., Gebrekirstos, A., Aynekulu, E., Bräuning, A. (2015): Tree dieback affected climate change mitigation potential of a dry afromontane forests in northern Ethiopia. Forest Ecology and Management 344: 73–83.
  • Wernicke, J., Grießinger, J., Hochreuther, J., Bräuning, A. (2015): Variability of summer humidity during the past 800 years on the eastern Tibetan Plateau inferred from δ18O of tree-ring cellulose. Climate of the Past 11, 327–337. doi:10.5194/cp-11-327-2015.
  • Hochreuther, P., Loibl, D., Wernicke, J., Zhu, H., Grießinger, J., Bräuning, A. (2015): The end of the Little Ice Age in southeast Tibet derived from moraine dating. Palaeogeography, Palaeoclimatology, Palaeoecology 422: 1–10.
  • Qin, C., Bao Y., Bräuning, A., Grießinger, J., Wernicke, J. (2015): Investigating common signals in tree-ring stable isotopic oxygen series of Qilian juniper from the cold and arid northeast Tibetan Plateau.  Global and Planetary Change 215: 48-59.
  • Loibl, D., Hochreuther, P., Schulte, P., Hülle, D., Zhu, H., Bräuning, A., Lehmkuhl, F. (2015): Towards a late Holocene glacial chronology for the eastern Nyainqêntanglha Range, southeastern Tibet. Quaternary Science Reviews 107: 243-259.
  • Wang, Z., Yang, B., Deslauriers, A., Bräuning, A. (2015): Intra-annual stem radial increment response of Qilian juniper to temperature and precipitation along an altitudinal gradient in northwestern China. Trees – Structure and Function 29:25–34. DOI 10.1007/s00468-014-1037-7.

2014 und älter

Prof. Dr. Achim Bräuning

  • Tätigkeit: Ordinarius
  • Adresse:
    Wetterkreuz 15
    Raum 03.190
    91058 Erlangen
  • Telefonnummer: +49 9131 85-29372
  • E-Mail: achim.braeuning@fau.de
  • Sprechstunde:
    nur nach Vereinbarung
  • Dendrolabor
  • Isotopenlabor