PHOTO BY S. MANZONI Eco-hydrological optimality Eco-hydrological optimality to link to link water use and carbon gains water use and carbon gains by plants by plants Manzoni S. 1,2 , G. Vico 2 , S. Palmroth 3 , G. Katul 3,4 , and A. Porporato 3,4 1 Physical Geography and Quaternary Geology, Stockholm Univ. 2 Crop Production Ecology and Ecology Dept., SLU, Uppsala 3 Nicholas School of the Environment, Duke Univ., USA 4 Civil and Environmental Engineering, Duke Univ., USA
Eco-hydrological optimality to link water use and carbon gains by plants. Manzoni S. 1,2 , G. Vico 2 , S. Palmroth 3 , G. Katul 3,4 , and A. Porporato 3,4. 1 Physical Geography and Quaternary Geology, Stockholm Univ. 2 Crop Production Ecology and Ecology Dept., SLU, Uppsala - PowerPoint PPT Presentation
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PHOTO BY S. MANZONI
Eco-hydrological optimality to link Eco-hydrological optimality to link water use and carbon gains by plants water use and carbon gains by plants
Manzoni S.1,2, G. Vico2, S. Palmroth3, G. Katul3,4, and A. Porporato3,4
1Physical Geography and Quaternary Geology, Stockholm Univ.2Crop Production Ecology and Ecology Dept., SLU, Uppsala3Nicholas School of the Environment, Duke Univ., USA4Civil and Environmental Engineering, Duke Univ., USA
PHOTO BY S. MANZONI
Carbon uptake
Soil carbon
Respiration
Food, fiber, biofuels… Respiration
Soil moisturePHOTO BY S. MANZONI
EA
TranspirationCarbon uptake
Rainfall
Stomatal conductance as a “compromise between the need to provide a passage for assimilation and the prevention of excessive transpiration” (Cowan and Troughton, 1971, Planta)
How do plants respond to altered climatic conditions?
Can we optimize agro-ecosystem management to balance productivity and resource use?
Can we breed crops towards more efficient resource use?
Regulation of water transportStomatal closure limits
evaporation from the leaves
Lens (2011), New Phytologist
Plant xylem limits transport of liquid water to the leavesManzoni et al. (2013) Adv. Water Res.
-ψP
g c
-ψP
g P
E
LAI gc(P)
Water use strategies involve tradeoffs
1) High transpiration allows plants to grow faster → competitive advantage
(Eagleson, 2002, Rodriguez-Iturbe and Porporato 2004)
BUT: high transpiration lowers soil moisture faster → earlier water stress?