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首页> 外文期刊>Scandinavian Journal of Forest Research >Sap flux - a real time assessment of health status in Norway spruce
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Sap flux - a real time assessment of health status in Norway spruce

机译：汁液通量-实时评估挪威云杉的健康状况

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Top dieback of Norway spruce (Picea abies), triggered by drought in 2004-2006, has been observed in Southeast Norway and trees died within four years after appearance of the first symptoms. The aim of our study was to use sap flux measurements as a diagnostic method for assessment of tree vitality. We used the heat field deformation method to monitor the sap flux density (SFD) in four pairs of healthy and declining trees in situ. To provide retrospective information on hydraulic performance of the trees we took samples for wood anatomical analysis. After felling the trees we used the modified differential translucence method (MDT) as a proxy for the SFD measurements. Healthy trees had three times higher SFD values as declining trees. In some healthy trees we detected decreasing SFD with time. The MDT method agreed with the SFD measurements. In conclusion, we detected sap flux dysfunction in declining trees and showed that the SFD reduction may occur during a short period, prior to occurrence of any visual symptoms. We suggest incorporating the SFD measurements into the repertoire of diagnostic tools in forest pathology.
机译：在挪威东南部，2004年至2006年的干旱引发了挪威云杉（Picea abies）的极度死亡，在出现第一种症状后的四年内树木死亡。我们研究的目的是使用树液通量测量作为评估树木活力的诊断方法。我们使用热场变形方法来现场监测四对健康下降中的树木的树液通量密度（SFD）。为了提供有关树木水力性能的回顾性信息，我们抽取了样本进行木材解剖分析。砍伐树木后，我们使用改进的差分半透明方法（MDT）作为SFD测量的代理。健康树木的SFD值是树木下降的三倍。在一些健康的树木中，我们检测到SFD随着时间的推移而下降。 MDT方法与SFD测量结果一致。总之，我们在下降的树木中检测到了汁液通量功能障碍，并表明SFD的降低可能会在短时间内出现任何视觉症状之前发生。我们建议将SFD测量结果纳入森林病理学诊断工具库中。

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