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The response of winter wheat and soybean to drought stress under the increased CO₂ concentration

摘要：通过试验研究了在高CO₂浓度(700×10^-6)条件下, 土壤水分胁迫对小麦和大豆的影响.结果表明:CO₂浓度升高可缓解土壤水分亏缺对大豆和小麦的伤害.CO₂浓度升高和干旱胁迫均使叶片气孔阻力增大, 蒸腾速率下降.高CO₂浓度条件下, 出现干旱胁迫时, 蒸腾速率下降幅度更大, 因而减少水分损失, 提高叶片和整个植株的水势, 增强耐旱能力;CO₂浓度上升使大豆和小麦积累了更多生物产量, 补偿了干旱胁迫带来的损失, 提高了水分利用率;CO₂浓度升高和干旱胁迫有利于小麦和大豆叶片硫、锌和铁的积累.

Abstract：The impact on wheat and soybean under the condition of increased CO₂ concentration was studied through the experiments. The result showed that by increasing CO₂ concentration (700×10^-6) the damage of drought stress (30%—40% of soil water capacity) on soybean and wheat could be relaxed. With the in crease of CO₂ concentration and drought stress, the leaf stoma resistance increase and transpiration rate decrease. Under the high CO₂ concentration, the transpiration rate decreased vabidly when the drought appeared. Therefore, it raises the water loss and increases the water potential for leaves and plants increased, and the drought-resistant ability strengthened. The increasing of CO₂ concentration may make soybean and wheat accumulate more bio-yield, and compensate yield loss caused by drought stress and improve water efficiency. Increasing CO₂ concentration is beneficial to wheat and soybean for the accumulating of sulphur, zinc and iron.