• How do changes in leaf assimilation rate under different atmospheric conditions
impact growth and final biomass of the whole plant over the season, and does
accelerated senescence in an elevated O 3 atmosphere impact overall soybean
growth?
All stocks in our model (Fig. 20.1) are expressed in grams of carbon, and all
flows are grams of carbon per hour. Leaf photosynthesis is calculated over the
growing season by integrating the product of leaf assimilation rate, photoinhibition,
specific leaf area, and a diurnal switch, which indicates whether the plant operates
under day or night conditions. The diurnal cycle itself is specified using the built-in
function MOD. X MOD Y gives the remainder when X is divided by Y. In our case,
TIME MOD 24 is 3 in period 27, 4 in period 28, etc. Thus,
Daily cycle ¼ TIME MOD 24
ð
Þ þ 1,
ð20:1Þ
Fig. 20.1
158
20 Soybean Plant Growth
impact growth and final biomass of the whole plant over the season, and does
accelerated senescence in an elevated O 3 atmosphere impact overall soybean
growth?
All stocks in our model (Fig. 20.1) are expressed in grams of carbon, and all
flows are grams of carbon per hour. Leaf photosynthesis is calculated over the
growing season by integrating the product of leaf assimilation rate, photoinhibition,
specific leaf area, and a diurnal switch, which indicates whether the plant operates
under day or night conditions. The diurnal cycle itself is specified using the built-in
function MOD. X MOD Y gives the remainder when X is divided by Y. In our case,
TIME MOD 24 is 3 in period 27, 4 in period 28, etc. Thus,
Daily cycle ¼ TIME MOD 24
ð
Þ þ 1,
ð20:1Þ
Fig. 20.1
158
20 Soybean Plant Growth