Bringing the Kok effect to light: A review on the integration of daytime respiration and net ecosystem exchange
Bringing the Kok effect to light: A review on the integration of daytime respiration and net ecosystem exchange
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DOI：
10.1890/es13-00120.1
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发表时间：
2013-08-01
期刊：
影响因子：
2.7
通讯作者：
Griffin, Kevin L.
中科院分区：
文献类型：
--
作者：
Heskel, Mary A.;Atkin, Owen K.;Griffin, Kevin L.
净生态系统交换（NEE）代表通过光合作用或总初级生产力（GPP）同化的碳与通过生态系统呼吸（ER）释放的碳之间的差异。NEE，通过涡度协方差和室技术测量，必须划分为这些通量，以准确地描述和理解生态系统的碳动力学。GPP和白天ER可能会显着高估，如果叶片线粒体呼吸的光抑制，或“Kok效应，”没有准确估计，并进一步整合到生态系统的测量。据报道，呼吸的光抑制，多个细胞途径的复合效应，导致叶片线粒体呼吸抑制25-100%，因此，在估计较大的碳通量时需要考虑。在自养和异养呼吸之间划分呼吸，并将这些缩放的呼吸通量应用于生态系统水平被证明是困难的，并且将光抑制整合到单一和连续的生态系统呼吸措施中将需要对陆地生态系统中的碳交换进行新的解释和分析。
Net ecosystem exchange (NEE) represents the difference between carbon assimilated through photosynthesis, or gross primary productivity (GPP), and carbon released via ecosystem respiration (ER). NEE, measured via eddy covariance and chamber techniques, must be partitioned into these fluxes to accurately describe and understand the carbon dynamics of an ecosystem. GPP and daytime ER may be significantly overestimated if the light inhibition of foliar mitochondrial respiration, or "Kok effect,'' is not accurately estimated and further integrated into ecosystem measurements. The light inhibition of respiration, a composite effect of multiple cellular pathways, is reported to cause between 25-100% inhibition of foliar mitochondrial respiration, and for this reason needs to be considered when estimating larger carbon fluxes. Partitioning of respiration between autotrophic and heterotrophic respiration, and applying these scaled respiratory fluxes to the ecosystem-level proves to be difficult, and the integration of light inhibition into single and continuous measures of ecosystem respiration will require new interpretations and analysis of carbon exchange in terrestrial ecosystems.