Sie sind hier: Startseite › Forschungsprojekte/Scientific … › WATERFLUX

Disentangling seasonal vegetation effects on ecosystem evapotranspiration and water use efficiency of a Mediterranean savannah-type oak forest (WATERFLUX, DFG)

 

EVAPO

 

Water represents one of the key factors driving ecosystem productivity due to the tight coupling between ecosystem water and carbon fluxes. A functional understanding of evapotranspiration and photosynthesis is required to understand the development of water and carbon fluxes, particularly in water-limited ecosystems where global climate change is expected to intensify drought and alter precipitation patterns. The aim of this project is a detailed mechanistic evaluation of the water balance and water use efficiency of a typical Mediterranean savannah-type oak woodland. The project will focus on seasonal dynamics of over- and understorey vegetation of this two-component system and on the vegetation feedbacks on water and carbon fluxes. The study will combine (1) ecosystem and understorey measurements of net CO2 and H2O fluxes with (2) an experimental approach (trenching plot design) to disentangle major vegetation effects on water and carbon processes, and (3) a modelling approach to integrate the information gained from the different scales. Partitioning of net water fluxes into their individual components will be achieved by the use of stable isotopes. This project will deliver a process-based understanding of ecosystem water cycling and water use efficiency with a particular focus on the contribution of the understorey, which will be evaluated under consideration of future climate trends. Such improved understanding will help to develop appropriate management strategies and is needed for a risk assessment of climate change impact on Mediterranean ecosystems.

 

Publications

  • Dubbert Maren, Werner, Christiane (2019). Water fluxes mediated by vegetation: Emerging insights at the soil and atmosphere interfaces. New Phytologist, 221(4), 1754–1763. DOI: 10.1111/nph.15547

  • Dubbert, Maren; Kübert, Angelika; Werner, Christiane (2017) Impact of leaf traits on temporal dynamics of transpired oxygen isotope signatures and its impact on atmospheric vapor. Frontiers of Plant Science, 8, 5. DOI: 10.3389/fpls.2017.00005
  • Piayda, Arndt; Dubbert, Maren; Siegwolf, Rolf; Cuntz, Matthias; Werner, Christiane (2017). Quantification of dynamic soil–vegetation feedbacks following an isotopically labelled precipitation pulse. Biogeosciences, 14(9), 2293-2306. DOI: 10.5194/bg-14-2293-2017
  • Costa e Silva, Filipe; Correia, Alexandra C.; Piayda, Arndt; Dubbert, Maren; Rebmann, Corinna; Cuntz, Matthias; Werner, Christiane; David, Jorge Soares; Pereira, João Santos (2015). Effects of an extremely dry winter on net ecosystem carbon exchange and tree phenology at a cork oak woodland. Agriculture Forest Meteorology, 204, 48–57. DOI: 10.1016/j.agrformet.2015.01.017
  • Piayda, Arndt; Dubbert, Maren; Werner, Christiane; Correia, Alexandra; Pereira, João Santos; Cuntz, Matthias (2015). Influence of woody tissue and leaf clumping on vertically resolved leaf area index and angular gap probability estimates. Forest Ecology and Management, 340, 103–113. DOI: 10.1016/j.foreco.2014.12.026
  • Piayda, Arndt; Dubbert, Maren; Rebmann, Corinna; Kolle, Olaf; Costa e Silva, Filipe; Correia, Alexandra; Pereira, João Santos; Werner, Christiane; Cuntz, Matthias (2014). Drought impact on carbon and water cycling in a Mediterranean Quercus suber L. woodland during the extreme drought event in 2012, Biogeosciences, 11(24), 7159-7178. DOI: 10.5194/bg-11-7159-2014
  • Dubbert, Maren; Piayda, Arndt; Cuntz, Matthias; Correia, Alexandra; Pereira, João Santos; Werner, Christiane (2014). Stable oxygen isotope and flux partitioning demonstrates understory of an oak savanna contributes up to half of ecosystem carbon and water exchange. Frontiers in Plant Science, 5, 530. DOI: 10.3389/fpls.2014.00530
  • Dubbert, Maren; Piayda, Arndt; Cuntz, Matthias; Werner, Christiane (2014). Oxygen isotope signatures of transpired water vapor – the role of non-steady-state transpiration under natural conditions. New Phytologist, 203(4), 1242–1252. DOI: 10.1111/nph.12878
  • Dubbert, Maren; Mosena, Alexander; Piayda, Arndt; Cuntz, Matthias; Correia, Alexandra; Pereira, João Santos; Werner, Christiane (2014). Influence of tree cover on herbaceous layer development and fluxes in a Portuguese cork oak woodland. Acta Oecologica, 59, 35-45. DOI: 10.1016/j.actao.2014.05.007
  • Dubbert, Maren; Cuntz, Matthias; Piayda, Arndt; Maguas, Cristina; Werner, Christiane (2013). Partitioning evapotranspiration – Testing the Craig and Gordon model with field measurements of oxygen isotope ratios of evaporative fluxes. Journal of Hydrology, 496, 142-153. DOI: 10.1016/j.jhydrol.2013.05.033