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首页> 外文期刊>Irrigazione e Drenaggio >Sap flow and transpiration on olive trees in different water availability.
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Sap flow and transpiration on olive trees in different water availability.

机译：不同水量下橄榄树上的汁液流动和蒸腾作用。

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The efficiency of the heat balance method in measuring xylem sap flow and in estimating canopy transpiration was evaluated. Two-year-old own-rooted olive trees cv. Coratina grown in 181 containers were used. Drought stress levels were monitored fromleaf water potentials measured at predawn using a Scholander-type pressure chamber. During the trial transpiration was measured using an open system ADC LCA4. The sap flow was monitored using the Dynagage Sap-Flow, with SGA13 sensors linked to a CR10 Datalogger, used for data acquisition every 60 seconds; data obtained were averaged every 30 minutes. The containers of olive plants to which sensors were applied were insulated with plastic film and aluminium foil to avoid the effects of direct sunshine and loss of water by evaporation from the soil. These trees were precision-weighed at hourly intervals throughout the day to obtain transpiration values; daily transpiration was calculated as the difference between the predawn weight and that measured atsunset. At the same hourly intervals leaf water potentials and gas exchange were monitored. Daily water flow in the plant estimated by the heat balance method was to soil water availability. The values of water lost during the day through transpiration,calculated using the heat balance method in both irrigated and drought-stressed olive trees, showed an error of～±7-8% when compared to that measured by weighing. The linear regressions between transpiration values estimated using the Dynagage and the ADC and those measured by weighing showed a good correlation.
机译：评估了热平衡法在测量木质部树液流动和估算冠层蒸腾量方面的效率。两岁的自有根橄榄树简历。使用在181个容器中生长的Coratina。使用Scholander型压力室从黎明前测得的叶水势监测干旱胁迫水平。在试验期间，使用开放系统ADC LCA4测量蒸腾量。使用Dynagage Sap-Flow监测树液流量，将SGA13传感器链接到CR10数据记录器，每60秒进行一次数据采集。每30分钟对获得的数据进行平均。应用了传感器的橄榄植物容器用塑料膜和铝箔绝缘，以避免阳光直射和土壤蒸发造成的水分流失。全天以小时为间隔，对这些树进行精确称重，以获得蒸腾值。计算每天的蒸腾量为黎明前的体重与日落时测得的体重之间的差。在相同的小时间隔内，监测叶片水势和气体交换。通过热平衡法估算出的植物中的每日水流量是土壤水的可利用量。使用热平衡法计算的水分和水分胁迫下橄榄树在蒸腾过程中白天的水分损失值，与称重相比，误差约为±7-8％。使用Dynagage和ADC估算的蒸腾值与通过称重测得的蒸腾值之间的线性回归显示出良好的相关性。

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