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Rigorosum Mizanur Rahman – 18.07.2019

Im Rahmen der mündlichen Doktorprüfung spricht
Mizanur Rahman

zum Thema
Growth and physiological responses of South Asian tropical moist forest trees to atmospheric CO2 and climate change

Tropical forests play a critical role in the global biogeochemical cycles and livelihood subsistence of millions of people. Yet, the impacts of elevated CO2 and subsequent changes in climate on tropical forests have not been adequately understood. Particularly, tree growth and physiological processes and their driving forces and mechanisms in South Asian moist tropical forest species are strongly understudied. In this thesis, we studied growth and physiological responses of South Asian tropical forest trees to elevated CO2 and climate change using a combination of approaches, including dendroclimatology, stable isotope analysis and modelling. We found a clear link between tree-growth decline and increasing temperature. Tree radial growth dropped by nearly 60% during the drought years, but drought resilience differed between ecologically contrasting tree species. We found a long-term increase in intrinsic water-use efficiency (iWUE) which was likely because of increasing atmospheric CO2, whereas inter-annual variations of iWUE were triggered mainly by temperatures. Our findings provide strong evidence that dendrochronology can be successfully applied in South Asian tropical moist forest trees to answer a variety of ecological and physiological questions in a global change context.

Wann: Dienstag, 18.07.19 um 10:00 Uhr
Wo: Institut für Geographie, Ort: 00.175 Seminarraum 2, Wetterkreuz 15

Betreuer: Prof. Dr. Achim Bräuning

Es ergeht herzliche Einladung!