Use of an analytical model to study limitations on net photosynthesis in Arbutus unedo under field conditions
Use of an analytical model to study limitations on net photosynthesis in Arbutus unedo under field conditions
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DOI：
10.1007/bf00379502
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发表时间：
1986-10
期刊：
影响因子：
2.7
通讯作者：
Peter Harley;J. Tenhunen;Otto L. Lange
中科院分区：
文献类型：
--
作者：
Peter Harley;J. Tenhunen;Otto L. Lange
通过对在葡萄牙生长的杨梅进行实地气体交换测量，获得了应用基于生理的c3光合作用分析模型所需的参数值。该模型成功地模拟了杨梅在自然和co2饱和条件下在无水分胁迫时期的日光合响应。利用该模型分析了各试验期限制初级生产力的因素。由于对二磷酸核酮糖（RuBP）再生能力的大量投入，即使在阴天，辐照度也很少受到限制，但气孔导度的限制相当大，平均超过30%。实验叶片保持在水平位置的事实至少是这些结果的部分原因。对RuBP羧基酶-加氧酶浓度明显高于RuBP再生能力的其他可能原因进行了讨论。
From field gas-exchange measurements onArbutus unedogrowing in Portugal, parameter values necessary to apply an analytical, physiologicallybased model ofC3photosynthesis were obtained. The model successfully simulated measured diurnal photosynthetic responses inArbutusduring periods without water stress, under both natural and CO2-saturating conditions. The model was used to analyze those factors limiting primary productivity during each of the experimental days. Due to a large investment in ribulose bisphosphate (RuBP) regeneration capacity, irradiance was rarely limiting, even during cloudy periods, but the limitation imposed by stomatal conductance was quite large, averaging over 30%. The fact that experimental leaves were maintained in a horizontal position is at least partially responsible for these results. Possible other reasons for this apparent excess of RuBP regeneration capacity visa-vis RuBP carboxylase-oxygenase concentration are discussed.