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首页> 外文期刊>Acta Horticulturae >Monitoring sap flow as indicator of transpiration and water status of an experimental olive tree orchard.
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Monitoring sap flow as indicator of transpiration and water status of an experimental olive tree orchard.

机译：监测汁液流量，作为实验性橄榄树果园蒸腾和水状况的指标。

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The relationship between water loss indicators and water status constraints in rainfed olive trees was studied under different environmental conditions and different levels of soil water status to assess drought adaptation. The experiment was carried out in an experimental olive tree orchard in southern Italy, from 2002 to 2007. Whole-plant water use was determined using a xylem sap flow method (compensation heat-pulse technique). Ancillary ecophysiological parameters, including stomatal conductance and water potentials (and stem radius variation for 2006 and 2007), were periodically measured. During the experimental period, from June to September, predawn leaf water potential decreased and this was associated with increasing soil moisture deficit, while the difference between predawn and midday leaf water potentials increased, suggesting anisohydric regulation of plant water potential. Olive trees exhibited a tight stomatal control over transpiration. The mean daily transpiration rate, canopy conductance and decoupling coefficient were lowest in 2007, the driest year. In 2007, the transpiration rate of the olive tree orchard averaged 1.01 and 1.16 mm d-1 in rainfed and well watered plants, respectively. These results support the idea that olive trees had conservative water use strategies. Soil-to-leaf hydraulic conductance declined in response to decreasing predawn leaf water potential, explaining increasing stomatal control of transpiration under progressive soil drying. Whereas the investigated olive trees did not experience severe water stress, an increased frequency of exceptionally warm and dry summers may have a more serious impact than a single event and would give resistant genotypes a competitive advantage in the long run.
机译：研究了不同环境条件和土壤水分状况不同水平下雨育橄榄树失水指标与水分状况约束之间的关系，以评估干旱适应性。该实验于2002年至2007年在意大利南部的一个实验性橄榄果园中进行。使用木质部树液流动法（补偿热脉冲技术）确定了整个植物的用水量。定期测量辅助生态生理参数，包括气孔导度和水势（以及2006和2007年茎半径的变化）。在实验期间（6月至9月），黎明前的叶片水势下降，这与土壤水分亏缺增加有关，而黎明前和中午叶片水势之间的差异增加，表明植物水势的等渗调节。橄榄树对蒸腾作用表现出严格的气孔控制。 2007年是最干旱的一年，日平均蒸腾速率，冠层电导率和去耦系数最低。 2007年，在雨养和浇水良好的植物中，橄榄果园的蒸腾速率分别为1.01和1.16 mm d -1 。这些结果支持了橄榄树具有保守的用水策略的想法。黎明前的叶片水势下降，土壤对叶的水力传导率下降，这说明在逐渐进行土壤干燥的情况下，气孔对蒸腾作用的控制增加。尽管所调查的橄榄树没有遭受严重的水分胁迫，但是异常温暖和干燥的夏季频率的增加可能比单个事件具有更严重的影响，并且从长远来看将使抗性基因型具有竞争优势。

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