College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, 225009, Jiangsu, China.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, 1 Xikang Road, Nanjing, 210098, Jiangsu, China.
Photosynth Res. 2021 Feb;147(2):145-160. doi: 10.1007/s11120-020-00797-w. Epub 2021 Jan 3.
Process-based coupled model of stomatal conductance-photosynthesis-transpiration was developed to estimate simultaneously stomatal conductance g, photosynthetic rate P, and transpiration rate T during leaf ontogeny. The modified Jarvis model was constructed by superposing the influence of leaf age LA on g in traditional Jarvis model. And the modified Farquhar model was constructed by incorporating the relationships of the LA with parameters in Farquhar model into traditional Farquhar model. The average and leaf-age-based coupled models were constructed, respectively, by combining traditional Farquhar and Penman-Monteith models with traditional Jarvis, and combining modified Farquhar and Penman-Monteith models with modified Jarvis. The results showed that the g, the maximum rate of carboxylation, maximum rate of electron transport, rate of triose phosphates utilization, and mitochondrial respiration rate varied in a positive skew pattern, while the mesophyll diffusion conductance decreased linearly with increase in LA. The average coupled model underestimated g, P, and T for young leaves and overestimated g, P, and T for old leaves. And the leaf-age-based coupled model generally perfected well in estimating g, P, and T for all leaves during leaf ontogeny. The study will provide basic information for either modeling leaf g, P, and T continuously, or upscaling them from leaf to canopy scale by considering the variation of LA within canopy.
建立了基于过程的气孔导度-光合作用-蒸腾作用耦合模型，以同时估算叶片发育过程中的气孔导度 g、光合速率 P 和蒸腾速率 T。通过在传统 Jarvis 模型中叠加叶片年龄 LA 对 g 的影响，构建了修正的 Jarvis 模型。通过将 LA 与 Farquhar 模型参数的关系纳入传统 Farquhar 模型，构建了修正的 Farquhar 模型。通过将传统 Farquhar 和 Penman-Monteith 模型与传统 Jarvis 模型相结合，以及将修正的 Farquhar 和 Penman-Monteith 模型与修正的 Jarvis 模型相结合，分别构建了平均耦合模型和基于叶片年龄的耦合模型。结果表明，g、羧化的最大速率、电子传递的最大速率、三磷酸甘油醛利用速率和线粒体呼吸速率呈正偏态分布，而质膜扩散导度随 LA 的增加呈线性下降。平均耦合模型低估了幼叶的 g、P 和 T，高估了老叶的 g、P 和 T。基于叶片年龄的耦合模型通常能很好地完善估算叶片发育过程中所有叶片的 g、P 和 T。该研究将为通过考虑冠层内 LA 的变化连续模拟叶片 g、P 和 T 或从叶片尺度上推升到冠层尺度提供基础信息。
