Info

temp relationship

20 30

Temperature (°C)

• Danielsson et al. (2003, OTC data) - Danielsson et al. (2003, AA data)

20 30

Temperature (°C)

• Danielsson et al. (2003, OTC data) - Danielsson et al. (2003, AA data)

Potato, ftemp relationship

Fig. 10.3 Parameterisation of wheat and potato stomatal conductance models. The function shown (ftemp) describes the dependence of the relative stomatal conductance (g) on temperature (see Chap. 3 of the Mapping Manual (LRTAP Convention 2007) for details)

Potato, ftemp relationship

Fig. 10.3 Parameterisation of wheat and potato stomatal conductance models. The function shown (ftemp) describes the dependence of the relative stomatal conductance (g) on temperature (see Chap. 3 of the Mapping Manual (LRTAP Convention 2007) for details)

20 30

Temperature (°C)

Ku et al. (1977, W729R) Dwelle et al. (1983, Russet Burbank)

« Pleijel et al. (2002, OTC data) + Pleijel et al. (2002, AA data)

20 30

Temperature (°C)

Ku et al. (1977, W729R) Dwelle et al. (1983, Russet Burbank)

« Pleijel et al. (2002, OTC data) + Pleijel et al. (2002, AA data)

10.7.2 Increased CO2 Concentration

Many short- and long-term studies have shown that plants grown in an elevated CO2 environment have reduced gs (Allen 1990; Drake et al. 1997). In potato, this CO2-induced reduction in gs was not affected by exposure to O3 per se (Vander-meiren et al. 2002), and thus increasing CO2 concentrations are likely to decrease O3 uptake. Indeed, in most studies, elevated CO2 leads to a reduction of O3 induced yield losses (e.g. Fiscus et al. 1997; Volin et al. 1998; Craigon et al. 2002).

10.7.3 Changes in Precipitation Patterns

In simplest terms, effects of changes in precipitation patterns are likely to be mediated directly through (i) effects of vapour pressure deficit (VPD) on gs with increasing VPD causing a decrease in flux and (ii) changes in soil water potential (SWP), with decreasing SWP resulting in decreased stomatal flux and vice versa (Fig. 10.4). Interactions between O3 stress and plant water use efficiency (WUE) are important due to co-occurrence of high O3 levels, combined with reduced soil moisture during warming. A reduction in soil moisture below a threshold will reduce the stomatal

Wheat, fVpD relationship

Wheat, fSwp relationship

Wheat, fVpD relationship

Wheat, fSwp relationship

□ Weber & Rennenberg (1996) x Tuebner F. (1985)

□ Gollan et al. (1986) x Emberson L. (1997) o Morgan J.A. (1994)

+• Ali et al. (1999) * Zhang et al. (1998) . Danielsson et al. (2003)

□ Weber & Rennenberg (1996) x Tuebner F. (1985)

□ Gollan et al. (1986) x Emberson L. (1997) o Morgan J.A. (1994)

+• Ali et al. (1999) * Zhang et al. (1998) . Danielsson et al. (2003)

Potato, fvpD relationship

Potato, fsWP relationship

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