Gas Exchange and Growth
Appendix: List of Symbols and Definitions
A - rate of net photosynthesis, Ilmol(C02) m- 2 s- 1
Amax - rate of net photosynthesis at saturating light and ambient CO2
Ap - integral of whole plant photosynthesis
B - biomass productivity (e.g., tha-1year- 1 )
175
C f - conversion factor indicating the biomass/carbon ratio of recently
produced dry matter
D - LAD, leaf area duration, days
EA - NAR, net assimilation rate kgm- 2 day-l
E - transpiration rate, mmolm- 2 s- 1 (or kgm- 2 day-l)
f - fraction of solar radiation intercepted by a canopy over a given period
F - LAR, leaf area ratio, m 2 kg- 1
k - light extinction coefficient
L - leaf area index
La - leaf area of a plant
L WR - leaf weight ratio
m - maintenance respiration coefficient
NUE - nitrogen use efficiency, kg (dry weight)/g (N)
Q - accumulated solar radiation, i and 0 subscripts stand for intercepted and
incident, respectively
R - rate of mitochondrial respiration, Ilmol(02)m-2s-1
Rp - integral of whole plant respiration
Rw - RGR, relative growth rate, day-l
w - water use efficiency, g (dry weight )/kg (H20)
Wi - instantaneous water use efficiency, mmol CO2/mol H20
W - plant biomass
Y G - growth conversion efficiency, i.e., ratio of C substrate used for dry
matter accumulation (~ST) and total substrate used in growth respiration
(ASG = ASR - AST )·
E - radiation utilization coefficient, g Mr 1
p - the mass of carbon in the plant per unit leaf area
0" - SLA, specific leaf area, m 2 kg- 1
References
Aerts R (1989) The effect of increased nutrient availability on leaf turnover and aboveground productivity of two evergreen ericaceous shrubs. Oecologia 78: 115-120
Amthor JS (1989) Respiration and crop productivity. Springer Berlin Heidelberg New
York
Azc6n-Bieto J (1983) Inhibition of photosynthesis by carbohydrates in wheat leaves. Plant
Physiol 73: 681-668
Appendix: List of Symbols and Definitions
A - rate of net photosynthesis, Ilmol(C02) m- 2 s- 1
Amax - rate of net photosynthesis at saturating light and ambient CO2
Ap - integral of whole plant photosynthesis
B - biomass productivity (e.g., tha-1year- 1 )
175
C f - conversion factor indicating the biomass/carbon ratio of recently
produced dry matter
D - LAD, leaf area duration, days
EA - NAR, net assimilation rate kgm- 2 day-l
E - transpiration rate, mmolm- 2 s- 1 (or kgm- 2 day-l)
f - fraction of solar radiation intercepted by a canopy over a given period
F - LAR, leaf area ratio, m 2 kg- 1
k - light extinction coefficient
L - leaf area index
La - leaf area of a plant
L WR - leaf weight ratio
m - maintenance respiration coefficient
NUE - nitrogen use efficiency, kg (dry weight)/g (N)
Q - accumulated solar radiation, i and 0 subscripts stand for intercepted and
incident, respectively
R - rate of mitochondrial respiration, Ilmol(02)m-2s-1
Rp - integral of whole plant respiration
Rw - RGR, relative growth rate, day-l
w - water use efficiency, g (dry weight )/kg (H20)
Wi - instantaneous water use efficiency, mmol CO2/mol H20
W - plant biomass
Y G - growth conversion efficiency, i.e., ratio of C substrate used for dry
matter accumulation (~ST) and total substrate used in growth respiration
(ASG = ASR - AST )·
E - radiation utilization coefficient, g Mr 1
p - the mass of carbon in the plant per unit leaf area
0" - SLA, specific leaf area, m 2 kg- 1
References
Aerts R (1989) The effect of increased nutrient availability on leaf turnover and aboveground productivity of two evergreen ericaceous shrubs. Oecologia 78: 115-120
Amthor JS (1989) Respiration and crop productivity. Springer Berlin Heidelberg New
York
Azc6n-Bieto J (1983) Inhibition of photosynthesis by carbohydrates in wheat leaves. Plant
Physiol 73: 681-668