Crop water relations under different CO2 and irrigation: testing of ecosys with the free air CO2 enrichment (FACE) experiment

Interactive effects of elevated CO2 and drought stress on leaf water potential and growth in Caragana intermedia

“…However, only relatively few investigations have considered the direct consequences of soil water deficits imposed on plants that are exposed to elevated CO 2 atmospheres (Serraj et al 1999). In studies concerned with the interactive effects of elevated CO 2 and water stress, some found that elevated CO 2 significantly increased plant growth (Kimball et al 1995;Centritto et al 1999;Serraj et al 1999;Ottman et al 2001;Wall et al 2001), possibly because plants growing in elevated CO 2 improved water relations under drought stress and were able to withstand the drought stress better (Grant et al 1999;Wall 2001;Wall et al 2001;Wullschleger et al 2002). However, there were also studies finding no positive effects of elevated CO 2 on plant growth under drought-stressed conditions (Mo et al 1992;Ward et al 1999;Derner et al 2003).…”

Modelling the response of wheat canopy assimilation to atmospheric CO2 concentrations

“…However the use of simplistic approaches often fails to account for a number of interacting effects such as temperature and water availability (Wolf, 1998). More sophisticated approaches have been proposed to account for interactive effects ( Kartschall et al , 1995;Melkonian et al , 1998;Grant et al , 1999). In general, these latter models calculate assimilation according to the biochemical description of Farquhar et al .…”

Carbon and energy exchange by a black spruce‐moss ecosystem under changing climate: Testing the mathematical model ecosys with data from the BOREAS experiment

“…product of CO 2 fixation is added to a pool of stored C for each branch (defined here as a complete subcomponent of a plant including twigs and foliage) of each plant species from which C is oxidized to meet maintenance respiration requirements using a first order function of stored C [Grant et al, 1999b]. If the pool of stored C is depleted, the C oxidation rate may be less than the maintenance respiration requirement, in which case the difference is made up through respiration of remobilizable C in leaves and twigs.…”

“…When oxidation of stored C exceeds maintenance respiration• the excess is used /or growth respiration to drive the formation of new biomass [Grant et al, 1999b] as described in section 2.1.4. 2.1.3.…”

“…Stomatal conductance is also an exponential function of canopy turgor generated from a convergence solution for canopy water potential at which the difference between transpiration and root water uptake equals the difference between canopy water contents at the water potentials of the previous and current time steps [Grant et al, 1999b]. Canopy transpiration is solved from a first order solution to the canopy energy balance [Grant et al, 1999b]. …”