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Benefits of CO2 enrichment on crop plants are modified by soil water status

机译：土壤水分状况改变了二氧化碳富集对农作物的好处

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Three species, wheat, maize and cotton, were grown in pots and subjected to high (85–100% field capacity, ΘF), medium (65–85% ΘF) and low (45–65% ΘF) soil moisture treatments and high (700 μl l−1) and low (350 μl l−1) CO2 concentrations. Biomass production, photosynthesis, evapotranspiration and crop water use efficiency were investigated. Results showed that the daily photosynthesis rate was increased more in wheat and cotton at high [CO2] than in maize. In addition, differences were more substantial at low soil water treatment than at high soil water treatment. The daily leaf transpiration was reduced significantly in the three crops at the high CO2 concentration. The decrease at low soil water was smaller than at high soil water. Crop biomass production responses showed a pattern similar to photosynthesis, but the CO2-induced increase was more pronounced in root production than shoot production under all soil water treatments. Low soil water treatment led to more root biomass under high [CO2] than high soil water treatment. CO2 enrichment caused a higher leaf water use efficiency (WUE) of three crops and the increase was more significant in low than in high soil water treatment. Crop community WUE was also increased by CO2 enrichment, but the increase in wheat and cotton was much greater than in maize. We conclude that at least in the short-term, C3 plants such as wheat and cotton may benefit from CO2 enrichment especially under water shortage condition.
机译：小麦，玉米和棉花这三个物种分别在盆中种植，分别处于高（85–100％ΘF），中（65–85％ΘF）和低（45–65）之间。 ％ΘF）土壤水分处理以及高（700μll-1 ）和低（350μll-1 ）CO2 浓度的处理。研究了生物量生产，光合作用，蒸散量和作物水分利用效率。结果表明，在高[CO2 ]条件下，小麦和棉花的日光合作用速率比玉米高。此外，低土壤水处理比高土壤水处理的差异更大。在高CO2浓度下，三种农作物的每日叶片蒸腾作用明显降低。在低土壤水分下的减少小于在高土壤水分下的减少。在所有土壤水分处理下，作物生物量生产的响应均表现出与光合作用相似的模式，但在根部生产中，CO2引起的增幅大于芽生长。低土壤水处理比高土壤水处理导致更多的根系生物量。 CO2 的富集导致三种农作物的叶片水分利用效率（WUE）更高，低水平的增加比高土壤水分处理的增加更为显着。二氧化碳的富集也增加了作物群落的水分利用效率，但小麦和棉花的增加远大于玉米。我们得出结论，至少在短期内，小麦和棉花等C3 植物可能会受益于CO2 的富集，特别是在缺水条件下。

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