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首页> 外文期刊>HortScience >Portable through-flow cuvette system for measuring whole-canopy gas exchange of apple trees in the field.
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Portable through-flow cuvette system for measuring whole-canopy gas exchange of apple trees in the field.

机译：便携式通流比色皿系统，用于测量野外苹果树的全冠气体交换。

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摘要

A monitoring and control system for sequentially measuring whole-tree-canopy gas exchange of 4 apple trees (cv. Borkh) in the field is described. A portable, highly transparent, open-top whole-canopy cuvette was developed for complete enclosure of the above-ground portion of the tree. The flux of whole-canopy CO2 and H2O vapour was estimated from differential CO2 concentration and H2O-vapor partial pressure between ambient/reference air entering and leaving the cuvette, measured by infrared gas analysis. The bulk air flow rate through the chamber was measured with a Pitot static tube inserted into the air-supply duct and connected to a differential pressure transducer. Performance of the whole-canopy cuvette system was tested for its suitability for gas-exchange measurements under field conditions. The air flow through the whole-canopy cuvette was 22 000 litres/min (?.5 air exchanges/min) during the day, providing adequate air mixing within the cuvette, and 4000 litres/min (? air exchange/min)during the night. Daily average leaf temperatures within the cuvette were 2-3 deg C higher than for trees outside the cuvette. Photosynthetic photon flux transmitted through the chamber walls was >=92% of the incident ambient radiation. The whole-canopy cuvette was evaluated without tree enclosure to determine the degree of 'noise' in differential CO2 concentration and H2O-vapor partial pressure and was acceptable with DELTACO2 ±0.3μmol/mol and DELTAH2O ±5 Pa. Whole-canopy carbon gas exchange and transpiration of 4 cropping Braeburn/M.26 apple trees followed closely incident radiation over the course of a day.
机译：描述了一种监视和控制系统，该监视和控制系统用于在现场顺序测量4棵苹果树（乔克·波克）的全树冠层气体交换。开发了一种便携式，高度透明的，敞开的全树冠比色皿，用于完全封闭树的地面部分。根据通过红外气体分析测量的进入/离开比色杯的环境/参考空气之间的差分CO2浓度和H2O蒸气分压，估算了全冠层CO2和H2O蒸气的通量。通过皮托管静态管（插入空气供应管道并连接至差压传感器）测量通过腔室的总体空气流速。测试了全遮盖比色皿系统的性能，以适合在野外条件下进行气体交换测量。白天，流经全顶棚比色杯的空气流量为22000升/分钟（？0.5空气交换/分钟），可在比色杯内提供足够的空气混合，而在整个测试期间为4000升/分钟（？空气交换/分钟）。晚。比色皿内的日平均叶温比比色皿外的树木高2-3摄氏度。通过室壁传输的光合光子通量大于入射环境辐射的92％。对整个树冠比色皿进行了无树围挡评估，以确定差异的CO2浓度和H2O蒸气分压中的“噪声”程度，并且在DELTACO2±0.3μmol/ mol和DELTAH2O±5 Pa的情况下是可接受的。在一天的过程中，4棵种植的Braeburn / M.26苹果树的蒸腾和蒸腾都紧随入射辐射。

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