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首页> 外文期刊>Acta Agronomica >Effect of soil water availability on gas exchange in young trees of Eucalyptus grandis W. Hill ex Maiden
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Effect of soil water availability on gas exchange in young trees of Eucalyptus grandis W. Hill ex Maiden

机译：土壤水分有效性对大桉树幼树幼树气体交换的影响

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Two outdoor trials were conducted in the department of Valle del Cauca, Colombia, in contrasting climatic conditions, to evaluate the effect of soil water availability on the gas exchange of four elite genotypes of Eucalyptus grandis as follows: 28-3, 18-3, 24A-5 and 19-1, respectively. One trial was conducted on the campus of the Universidad Nacional de Colombia located in Palmira, at 994 m.a.s.l. with an average temperature of 23.5°C (maximum of 31°C, minimum of 18°C), and 76% relative humidity (RH). The second trial was conducted at the nursery of Carton de Colombia S.A., located in Restrepo, at 1450 m.a.s.l. with an average temperature 18°C (maximum of 26°C, minimum of 12°C) and 80% RH. A split-plot design with four replicates was used. Treatments were field capacity (FC), 1/2 FC, 1/4 FC, and soil waterlogging. At both locations, pot surfaces were covered with plastic sheeting to prevent the entrance of rainfall. Significant differences between water regimes, genotypes and locations occurred in photosynthesis rate, internal CO2 of the substomatal cavity (Ci), stomatal conductance, and transpiration rate, indicating that E. grandis has physiological defense mechanisms to drought stress such as stomata closure, evidenced by a decreasing in photosynthesis rate, stomatal conductance, and transpiration rate. A differential response was also observed between genotypes depending on the environment, indicating a genotype x environment interaction in terms of plant physiological response. Eucalyptus grandis appears to save water under water stress conditions by a decreasing in photosynthesis rate. Excess water is more limiting than water deficit.
机译：在气候条件不同的情况下，哥伦比亚的瓦莱德尔考卡省部门进行了两次户外试验，以评估土壤水分有效性对四种桉树大基因型气体交换气体的影响，分别为：28-3、18-3，分别为24A-5和19-1。在位于帕尔米拉（Palmira）的哥伦比亚国立大学校园内进行了一项试验，地点为994m.a.s.l。平均温度为23.5°C（最高31°C，最低18°C），相对湿度（RH）为76％。第二次试验是在1450 m.a.s.l.位于雷斯特雷波（Restrepo）的哥伦比亚纸箱公司（Carton de Colombia S.A.）的苗圃中进行的。平均温度18°C（最高26°C，最低12°C）和80％RH。使用具有四个重复的分裂图设计。处理方法包括田间持水量（FC），1/2 FC，1/4 FC和土壤涝渍。在两个位置，锅的表面都覆盖有塑料布，以防止降雨进入。水分状况，基因型和位置之间的显着差异发生在光合作用速率，气孔下内部CO2（Ci），气孔导度和蒸腾速率方面，表明大肠埃希斯菌具有抗干旱的生理防御机制，例如气孔关闭。光合速率，气孔导度和蒸腾速率降低。根据环境，在基因型之间还观察到差异反应，表明就植物生理反应而言，基因型x环境相互作用。桉树似乎通过降低光合作用速率而在缺水条件下节水。多余的水比缺水更多地受到限制。

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