閉鎖系植物実験施設における作物固体群のCO2交換シミュレーションへの光合成生化学モデルの適用

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To predict carbon exchange rates of crop populations cultivated in the closed plantation experiment facility (CPEF), it is necessary to simulate the response of photosynthesis to changes in environmental conditions. We examined whether photosynthetic responses of a soybean population to changes in environmental conditions could be predicted by a biochemical photosynthesis model treating a canopy of the population as a single layer, i.e. as a ‘big leaf’. Soybean populations were cultivated under three sets of growth conditions for atmospheric CO2 partial pressure and daytime air temperature: 35, 70, and 70 Pa, and 24, 24, and 26°C, respectively. When light-photosynthesis curves of the three soybean populations were predicted using maximum electron transport rates (Jmax) and respiration rates (R) per unit cultivation area obtained from their respective growth conditions, predicted light-photosynthesis curves matched measured photosynthetic responses to short-term changes in photosynthetically active radiation (PAR), i.e. to stepwise increases in PAR at an interval of two hours. On the other hand, changes in light-photosynthesis curves to changes in the growth conditions lasting more than one month were not accurately predicted by the model, since Jmax per unit leaf area differed among the growth conditions. We concluded that the biochemical photosynthesis model could be used to predict photosynthetic responses of crop populations in the CPEF to environmental changes on the time scale of hours since photosynthetic acclimation would not occur in response to such environmental changes.
生態工学会の論文

閉鎖系植物実験施設における作物固体群のCO2交換シミュレーションへの光合成生化学モデルの適用

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