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光和CO2作用下C3和C4作物气孔导度-光合速率耦合关系的差异

DOI: 10.7668/hbnxb.2008.01.016, PP. 71-75

Keywords: C3作物,C4

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Abstract:

气孔控制着光合作用和蒸腾作用两个相互耦合的过程,气孔导度与光合速率的耦合关系是理解陆地生态系统碳循环和水循环及其耦合关系的基础。利用LI-6400光合仪控制光强和CO2浓度变化,分析了C3和C42浓度变化条件下,Ball-Berry模型也能很好地模拟气孔导度与光合速率二者的耦合关系。气孔导度与净光合速率之间的耦合系数体现了不同作物之间水-碳交换比例的差异,反映了气孔限制和内部生理生化过程限制在不同作物上所占的比例。由于该系数在C3作物和C43作物中,陆生C3作物和水生C3作物也存在一定差异,因此作物的生态功能类型可以大体划分为3类:C43作物和水生C3作物。这种生态功能类型的划分为提高碳循环、水循环以及水碳耦合循环模型在区域尺度上应用的精度是有益的。

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