An improved method and data analysis for ultrasound acoustic emissions and xylem vulnerability in conifer wood.

The vulnerability of the xylem to cavitation is an important trait in plant drought resistance and has been quantified by several methods. We present a modified method for the simultaneous measurement of cavitations, recorded as ultrasound acoustic emissions (UAEs), and the water potential, measured with a thermocouple psychrometer, in small samples of conifer wood. Analyzing the amplitude of the individual signals showed that a first phase, during which the mean amplitude increased, was followed by a second phase with distinctly lower signal amplitudes. We provide a method to separate the two groups of signals and show that for many samples plausible vulnerability curves require rejecting late low-energy UAEs. These very likely do not result from cavitations. This method was used to analyze the differences between juvenile wood, and early and late mature wood in Picea abies (L.) Karst. Juvenile earlywood was more resistant to cavitation than mature earlywood or latewood, which we relate to the tracheid anatomy of the samples.

[1]  P. Hietz,et al.  Comparison of methods to quantify loss of hydraulic conductivity in Norway spruce , 2008, Annals of Forest Science.

[2]  Stefan Mayr,et al.  Cavitation in dehydrating xylem of Picea abies: energy properties of ultrasonic emissions reflect tracheid dimensions. , 2011, Tree physiology.

[3]  Bernhard Plank,et al.  Radial shrinkage and ultrasound acoustic emissions of fresh versus pre-dried Norway spruce sapwood , 2010, Trees.

[4]  Bo Karlsson,et al.  Shrinkage processes in standard-size Norway spruce wood specimens with different vulnerability to cavitation. , 2009, Tree physiology.

[5]  F. Meinzer,et al.  SAFETY FACTORS FOR XYLEM FAILURE BY IMPLOSION AND AIR-SEEDING WITHIN ROOTS, TRUNKS AND BRANCHES OF YOUNG AND OLD CONIFER TREES , 2009 .

[6]  U. Müller,et al.  Hydraulic and mechanical properties of young Norway spruce clones related to growth and wood structure. , 2007, Tree physiology.

[7]  Barbara Lachenbruch,et al.  Bordered pit structure and function determine spatial patterns of air-seeding thresholds in xylem of Douglas-fir (Pseudotsuga menziesii; Pinaceae) trees. , 2006, American journal of botany.

[8]  J. Sperry,et al.  Mechanical reinforcement of tracheids compromises the hydraulic efficiency of conifer xylem. , 2006, Plant, cell & environment.

[9]  Bo Karlsson,et al.  Extraction of features from ultrasound acoustic emissions: a tool to assess the hydraulic vulnerability of Norway spruce trunkwood? , 2006, The New phytologist.

[10]  S. Pang,et al.  Physical properties of earlywood and latewood of Pinus radiata D. Don: Anisotropic shrinkage, equilibrium moisture content and fibre saturation point , 2005 .

[11]  Hervé Cochard,et al.  Evaluation of a new centrifuge technique for rapid generation of xylem vulnerability curves , 2005 .

[12]  D. Yoon,et al.  Pattern Classification of Acoustic Emission Signals during Wood Drying by Principal Component Analysis and Artificial Neural Network , 2005 .

[13]  J. Sperry,et al.  Analysis of circular bordered pit function II. Gymnosperm tracheids with torus-margo pit membranes. , 2004, American journal of botany.

[14]  John A. Milburn,et al.  The conduction of sap , 1966, Planta.

[15]  Grzegorz Musielak,et al.  The identification of fracture in dried wood based on theoretical modelling and acoustic emission , 2004, Wood Science and Technology.

[16]  P. Hietz,et al.  Vulnerability curves from conifer sapwood sections exposed over solutions with known water potentials. , 2003, Journal of experimental botany.

[17]  S. Mayr,et al.  A new method for vulnerability analysis of small xylem areas reveals that compression wood of Norway spruce has lower hydraulic safety than opposite wood , 2003 .

[18]  J. Domec,et al.  How do water transport and water storage differ in coniferous earlywood and latewood? , 2002, Journal of experimental botany.

[19]  F. C. Beall,et al.  Overview of the use of ultrasonic technologies in research on wood properties , 2002, Wood Science and Technology.

[20]  U K Vogt,et al.  Hydraulic vulnerability, vessel refilling, and seasonal courses of stem water potential of Sorbus aucuparia L. and Sambucus nigra L. , 2001, Journal of experimental botany.

[21]  Barbara L. Gartner,et al.  Cavitation and water storage capacity in bole xylem segments of mature and young Douglas-fir trees , 2001, Trees.

[22]  J. Gril,et al.  A model of anisotropic swelling and shrinking process of wood , 2001, Wood Science and Technology.

[23]  C. V. Willigen,et al.  A mathematical and statistical analysis of the curves illustrating vulnerability of xylem to cavitation. , 1998, Tree physiology.

[24]  J. Benson.  Acacia's Revise , 1997 .

[25]  W. Moliński,et al.  The Monitoring of Drying Cracks in the Tension and Opposite Wood by Acoustic Emission and Scanning Electron Microscopy Methods , 1996 .

[26]  Peter Fratzl,et al.  The elementary cellulose fibril in Picea abies : comparison of transmission electron microscopy, small-angle X-ray scattering, and wide-angle X-ray scattering results , 1995 .

[27]  Peter Fratzl,et al.  Size and Arrangement of Elementary Cellulose Fibrils in Wood Cells: A Small-Angle X-Ray Scattering Study of Picea abies , 1994 .

[28]  H. Cochard,et al.  Vulnerability of several conifers to air embolism. , 1992, Tree physiology.

[29]  A. Sellin,et al.  Hydraulic Conductivity of Xylem Depending on Water Saturation Level in Norway Spruce (Picea Abies (L.) Karst.) , 1991 .

[30]  M. Gullo,et al.  Three different methods for measuring xylem cavitation and embolism : a comparison , 1991 .

[31]  Melvin T. Tyree,et al.  Water‐stress‐induced xylem embolism in three species of conifers , 1990 .

[32]  Melvin T. Tyree,et al.  Characterization and propagation of acoustic emission signals in woody plants: towards an improved acoustic emission counter , 1989 .

[33]  A. Tyree,et al.  Vulnerability of Xylem to Cavitation and Embolism , 1989 .

[34]  Melvin T. Tyree,et al.  A method for measuring hydraulic conductivity and embolism in xylem , 1988 .

[35]  C. Mario,et al.  Juvenile - mature wood transition in second-growth coastal Douglas-fir , 1987 .

[36]  A. Lang.  Osmotic coefficients and water potentials of sodium chloride solutions from 0 to 40°C , 1967 .