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首页> 美国卫生研究院文献>Wiley-Blackwell Online Open >Carbonyl sulfide (COS) as a tracer for canopy photosynthesis transpiration and stomatal conductance: potential and limitations
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Carbonyl sulfide (COS) as a tracer for canopy photosynthesis transpiration and stomatal conductance: potential and limitations

机译：羰基硫（COS）作为冠层光合作用蒸腾作用和气孔导度的示踪剂：潜力和局限性

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The theoretical basis for the link between the leaf exchange of carbonyl sulfide (COS), carbon dioxide (CO2) and water vapour (H2O) and the assumptions that need to be made in order to use COS as a tracer for canopy net photosynthesis, transpiration and stomatal conductance, are reviewed. The ratios of COS to CO2 and H2O deposition velocities used to this end are shown to vary with the ratio of the internal to ambient CO2 and H2O mole fractions and the relative limitations by boundary layer, stomatal and internal conductance for COS. It is suggested that these deposition velocity ratios exhibit considerable variability, a finding that challenges current parameterizations, which treat these as vegetation-specific constants. COS is shown to represent a better tracer for CO2 than H2O. Using COS as a tracer for stomatal conductance is hampered by our present poor understanding of the leaf internal conductance to COS. Estimating canopy level CO2 and H2O fluxes requires disentangling leaf COS exchange from other ecosystem sources/sinks of COS. We conclude that future priorities for COS research should be to improve the quantitative understanding of the variability in the ratios of COS to CO2 and H2O deposition velocities and the controlling factors, and to develop operational methods for disentangling ecosystem COS exchange into contributions by leaves and other sources/sinks. To this end, integrated studies, which concurrently quantify the ecosystem-scale CO2, H2O and COS exchange and the corresponding component fluxes, are urgently needed.We investigate the potential of carbonyl sulfide (COS) for being used as a tracer for canopy net photosynthesis, transpiration and stomatal conductance by examining the theoretical basis of the link between leaf COS, carbon dioxide (CO2) and water vapour (H2O) exchange. Our analysis identifies several limitations that need to be overcome to this end, however at present we lack appropriate ecosystem-scale field measurements for assessing their practical significance. It however appears that COS represents a better tracer for CO2 than H2O. Concurrent measurements of ecosystem scale COS, CO2 and H2O exchange are advocated.
机译：羰基硫（COS），二氧化碳（CO2）和水蒸气（H2O）的叶片交换之间联系的理论基础，以及为使用COS作为冠层净光合作用，蒸腾作用的示踪剂而需要做出的假设和气孔导度，被审查。为此目的，表明COS与CO2和H2O沉积速度的比率随内部与周围CO2和H2O摩尔分数的比率以及边界层，气孔和内部电导率的相对限制而变化。这些沉积速度比表现出相当大的可变性，这一发现对当前的参数化提出了挑战，该参数化将这些参数化处理视为植被特定的常数。结果表明，COS比H2O表现出更好的CO2示踪剂。目前我们对COS叶片内部电导的了解不足，阻碍了使用COS作为气孔导度的示踪剂。 COS研究应提高对COS与CO2和H2O沉积速率之比的变化以及控制因素的定量理解，并开发将生态系统COS交换分解为叶子和其他来源/汇的贡献的操作方法。为此，迫切需要同时量化生态系统规模的CO2，H2O和COS交换以及相应的组分通量的综合研究。我们研究了羰基硫（COS）用作冠层净光合作用示踪剂的潜力。通过检查叶片COS，二氧化碳（CO2）和水蒸气（H2O）交换之间的联系的理论基础，了解蒸腾作用和气孔导度。我们的分析确定了为此目的需要克服的几个局限性，但是目前我们缺乏适当的生态系统规模的野外测量来评估其实际意义。但是，似乎COS比H2O代表了更好的CO2示踪剂。提倡同时测量生态系统规模的COS，CO2和H2O交换。

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