Water in the stems of sessile oak (Quercus petraea) assessed by computer tomography with concurrent measurements of sap velocity and ultrasound emission
Water in the stems of sessile oak (Quercus petraea) assessed by computer tomography with concurrent measurements of sap velocity and ultrasound emission
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DOI：
10.1111/j.1365-3040.1995.tb00554.x
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发表时间：
1995-05
影响因子：
7.3
通讯作者：
A. Raschi;R. Tognetti;H. Ridder;C. Béres
中科院分区：
文献类型：
--
作者：
A. Raschi;R. Tognetti;H. Ridder;C. Béres
对不同水分胁迫条件下成年岩栎树干的热脉冲速度和超声声发射进行了同步测量。在植物的树干部分上，使用移动的计算机断层摄影机非破坏性地测量木材密度，该计算机断层摄影机测量穿过树干的准直辐射束的衰减。通过从不同方向扫描树干，可以绘制该部分的木材密度图。由于木材密度与含水量密切相关，因此该方法可以评估树干部分的含水量和该部分不同部分的水分状况。计算机断层扫描技术是非侵入性的，不受气候波动的影响。木材密度和热脉冲速度之间的密切协议，这两个参数和超声声发射之间的关系进行了讨论。树干无柄橡树似乎非常适合作为蓄水水库发挥重要作用，在树木的生存在长期的低土壤水分供应，特别是在全球气候变化的背景下。本文介绍了计算机断层摄影方法，并对进一步的研究提出了建议。
Concurrent measurements of heat pulse velocity and ultrasound acoustic emission were performed on the trunks of adult Quercus petraea plants under different water stress conditions. On the trunk section of the plants the wood density was measured non-destructively using a mobile computer tomograph which measures the attenuation of a collimated beam of radiation which traverses the trunk. By scanning the trunk in different directions, it is possible to map wood density in the section. As wood density is strictly correlated with water content, this method allows evaluation of the water content in the trunk section and the water conditions in the different parts of the section. The computer-tomograph technique is non-invasive and is not influenced by climatic fluctuations. A close agreement was found between wood density and heat pulse velocity; the relationship between these two parameters and ultrasound acoustic emission is discussed. Trunks of sessile oak appear well suited as water storage reservoirs playing an important role in tree survival during extended periods of low soil water availability, especially in the context of global climatic change. Here the computer-tomograph methodology is described and suggestions arc made for further research development.