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首页> 外文期刊>Global change biology >A global perspective, of ground level, 'ambient' carbon dioxide forassessing the response of plants to atmospheric CO2
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A global perspective, of ground level, 'ambient' carbon dioxide forassessing the response of plants to atmospheric CO2

机译：在全球范围内，从地面看，“环境”二氧化碳用于评估植物对大气二氧化碳的响应

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For most studies involving the response of plants to future concentrations of atmospheric carbon dioxide (CO2), a current concentration of 360-370 mu atm is assumed, based on recent data obtained from the Mauna Loa observatory. In the present study, average seasonal diurnal values of ambient CO2 obtained at ground level from three global locations (Australia, Japan and the USA) indicated that the average CO2 (at canopy height) can vary from over 500 mu atm at night to 350 mu atm during the day with average 24-h values ranging from 390 to 465 mu atm. At all sites sampled, ambient CO2 rose to a maximum value during the pre-dawn period (03.00-06.00 hours); at sunrise, CO2 remained elevated for several hours before declining to a steady-state concentration between 350 and 400 mu atm by mid-morning (08.00-10.00 hours). Responses of plant growth to simulations of the observed variation of in situ CO2 were compared to growth at a constant CO2 concentration in controlled environment chambers. Three diurnal patterns were used (constant 370 mu atm CO2, constant 370 during the day (07.00-19.00 hours), high CO2 (500 mu atm) at night; or, high CO2 (500 mu atm) at night and during the early morning (07.00-09.00 hours) decreasing to 370 mu atm by 10.00 hours). Three plant species soybean (Glycine max, L (Merr.), velvetleaf (Abutilon theophrasti L.) and tomato (Lycopersicon esculentum L.) - were grown in each of these environments. For soybean, high night-time CO2 resulted in a significant increase in net assimilation rate (NAR), plant growth, leaf area and biomass relative to a constant ambient value of CO2 by 29 days after sowing. Significant increases in NAR for all three species, and significant increases in leaf area, growth and total biomass for two of the three C3 species tested (velvetleaf and soybean) were also observed after 29 days post sowing for the high night/early morning diurnal pattern of CO2. Data from these experiments suggest that the ambient CO2 concentration experienced by some plants is higher than the Mauna Loa average, and that growth of some agricultural species at in situ CO2 levels can differ significantly from the constant CO2 value used as a control in many CO2 experiments. This suggests that a reassessment of control conditions used to quantify the response of plants to future, elevated CO2 may be required.
机译：对于大多数涉及植物对未来大气中二氧化碳（CO2）浓度的响应的研究，根据从莫纳罗阿天文台获得的最新数据，假定当前浓度为360-370微米大气压。在本研究中，从三个全球性地点（澳大利亚，日本和美国）在地面获得的环境CO2的平均季节性昼夜值表明，平均CO2（在冠层高度）可以从晚上的500多大气压变化到350亩的大气压。白天的atm，平均24-h值在390至465 mu atm之间。在所有采样点，在黎明前（03.00-06.00小时），环境CO2上升到最大值。日出时，CO 2保持升高的状态数小时，然后在早晨中旬（08.00-10.00小时）下降到350至400μatm的稳态浓度。将植物生长对观察到的原位CO2变化模拟的响应与在受控环境室内恒定CO2浓度下的生长进行了比较。使用了三种昼夜模式（恒定的370μatm的CO2，白天（07.00-19.00小时）恒定的370，夜间的高CO2（500μatm）;或夜间和清晨的较高的CO2（500μatm）。 （07.00-09.00小时），到10.00小时减少到370微米大气压。在上述每种环境中均种植了三种植物大豆（大豆Glycine max，L（Merr。），天鹅绒（Abutilon theophrasti L.）和番茄（Lycopersicon esculentum L.）。播种后第29天，相对于恒定的CO2值，净同化率（NAR），植物生长，叶面积和生物量的增加。所有三种物种的NAR均显着增加，叶面积，生长和总生物量也显着增加播种后29天后，还观察到了三个被测C3物种中的两个（绒毛和大豆）的CO2夜间/清晨昼夜模式，这些数据表明，某些植物所经历的环境CO2浓度高于莫纳罗阿平均值，某些农业物种在原位CO2水平下的生长可能与许多CO2实验中用作对照的恒定CO2值有显着差异，这表明对CO的重新评估可能需要用于控制植物对未来二氧化碳升高的反应的控制条件。

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