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首页> 外文期刊>Bothalia: African Biodiversity & Conservation >Comparative field performance of three different gas exchange systems
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Comparative field performance of three different gas exchange systems

机译：三种不同气体交换系统的现场性能比较

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We compared portable and continuously monitoring gas exchange systems under field conditions, using Protea glabra Thunb. as a test species. The aim was to determine if the same patterns of gas exchange and ancillary parameters could be obtained with rather different measurement systems, and whether the same interpretation and conclusions about environmental control of gas exchange could be drawn. The following systems were compared: 1, a ‘closed' portable 1RGA manufactured by Ll-Cor (LI-6200); 2, an ‘open' portable porometer manufactured by Walz; and 3, a continuously monitoring minicuvette system with temperature control facility, also manufactured by Walz. All three systems yielded similar diurnal curves for CO2? uptake, although absolute flux values for the minicuvette system were lower than those obtained for the portable systems. This was likely due to stem respiration and self-shading of leaves on the shoot enclosed in the minicuvette. Differences in sampling technique between the two portable systems, primarily with regard to changes in leaf orientation, resulted in some differences in absolute values of gas fluxes and ancillary parameters such as leaf temperature and leaf to air vapour pressure difference. However, data from all three systems allowed similar interpretations to be made about the environmental dependencies of gas exchange patterns. It appears that each system has certain drawbacks associated with widely varying field conditions. A combination of portable and continuous monitoring techniques would seem to be the most powerful approach to investigating the gas exchange patterns of terrestrial plants in their natural environment.
机译：我们使用Protea glabra Thunb在野外条件下比较了便携式和连续监测的气体交换系统。作为测试物种。目的是确定是否可以通过相当不同的测量系统获得相同的气体交换模式和辅助参数，以及是否可以得出关于气体交换环境控制的相同解释和结论。比较了以下系统：1，Ll-Cor（LI-6200）制造的“封闭式”便携式1RGA; 2，Walz制造的“开放式”便携式管道计; 3，具有温度控制功能的连续监控微型比色皿系统，也是由Walz制造的。这三个系统都产生了相似的二氧化碳日变化曲线。尽管微型比色皿系统的绝对通量值比便携式系统的绝对通量值低，但仍能吸收。这可能是由于微型比色皿中封闭的枝条上的茎呼吸和叶片的自身阴影。两个便携式系统之间采样技术的差异（主要是在叶片方向的变化方面）导致气体通量的绝对值和辅助参数（例如叶片温度和叶片与空气蒸汽压差）的某些差异。但是，来自所有三个系统的数据都允许对气体交换模式的环境依赖性做出类似的解释。似乎每个系统都有与广泛变化的现场条件相关的某些缺点。便携式和连续监测技术的结合似乎是调查陆地植物在自然环境中的气体交换模式的最有效方法。

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