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Effects of Atmospheric CO2 Enrichment on Photosynthesis Respiration and Growth of Sour Orange Trees

机译:大气CO2浓度升高对酸橙树光合作用呼吸和生长的影响

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摘要

Numerous net photosynthetic and dark respiratory measurements were made over a period of 4 years on leaves of 24 sour orange (Citrus aurantium) trees; 8 of them growing in ambient air at a mean CO2 concentration of 400 microliters per liter, and 16 growing in air enriched with CO2 to concentrations approaching 1000 microliters per liter. Over this CO2 concentration range, net photosynthesis increased linearly with CO2 by more than 200%, whereas dark respiration decreased linearly to only 20% of its initial value. These results, together with those of a comprehensive fine-root biomass determination and two independent aboveground trunk and branch volume inventories, suggest that a doubling of the air's current mean CO2 concentration of 360 microliters per liter would enhance the growth of the trees by a factor of 3.8.
机译:在4年的时间里,对24棵酸橙(Citrus aurantium)树木的叶子进行了许多净光合作用和黑暗呼吸测量。其中有8个在平均CO2浓度为每升400微升的环境空气中生长,有16个在富含CO2的空气中生长至接近每升1000微升的浓度。在此CO2浓度范围内,净光合作用随CO2线性增加200%以上,而暗呼吸则线性减少至其初始值的20%。这些结果,加上全面的细根生物量测定结果以及两个独立的地上树干和树枝量清单,表明空气中当前平均CO2浓度每升360微升加倍将使树木的生长提高一倍。 3.8。

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