Drivers of unstable climate-tree growth relationships in the circumpolar boreal forest in time and space

Medientyp: E-Book; Hochschulschrift

Titel: Drivers of unstable climate-tree growth relationships in the circumpolar boreal forest in time and space

Beteiligte: Lange, Jelena [VerfasserIn]; Wilmking, Martin [AkademischeR BetreuerIn]; Bräuning, Achim [AkademischeR BetreuerIn]

Körperschaft: Universität Greifswald

Erschienen: Greifswald, 29. Mai 2020

Umfang: 1 Online-Ressource (PDF-Datei: 151 Seiten, 9305 Kilobyte); Diagramme (farbig), Karten (farbig)

Sprache: Englisch

Identifikator:

Schlagwörter: Boreale Region > Wald > Waldkiefer > Weißfichte > Wachstum > Dendrochronologie > Dendroklimatologie > Waldgrenze > Baumgrenze > Ökologie > Klimaänderung > Holz > Anatomie > Pflanzenanatomie > Holzqualität > Dichtebestimmung

Entstehung:

Hochschulschrift: Dissertation, Mathematisch-Naturwissenschaftliche Fakultät der Universität Greifswald, 2020

Anmerkungen: Literaturverzeichnis: Seite 23-33

Beschreibung: Scots pine, White spruce, boreal forest, climate change, dendrochronology, dendroclimatology, dendroecology, treeline, wood anatomy, wood density

Tree growth in northern and upper treeline ecotones of the circumpolar boreal forest is generally limited by temperature, i.e., trees grow generally more under warm, and less under cold climatic conditions. Based on the assumption that this relationship between tree growth and climate is linear and stable through time, dendroclimatologists use tree rings as natural archives to reconstruct past temperature conditions. Such tree-ring based reconstructions, together with other natural archives (e.g., ice cores and pollen), constitute our understanding of past climatic conditions that reach beyond modern instrumental records. However, a steadily increasing amount of studies reports a recent reduction or loss of the summer temperature signal for several species and sites of the boreal forest. Such a reduction of temperature sensitivity results in temporally unstable climate-tree growth relationships, which challenges the work of dendroclimatologists by potentially leading to miscalibrations of past climatic conditions. On the upside, this shift in the trees’ climate sensitivity might point to a shift in tree growth-limiting factors and thus serve as an early indicator of climate change impacts. There is evidence that this recent reduction in temperature sensitivity might be caused by the observed strong temperature increase at high latitudes, and thus temperature-induced drought stress. Other potential drivers and amplifiers of this phenomenon are differing microsite conditions ...

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