The Hydraulic Architecture of Juniperus Communis L. Ssp. Communis: Shrubs and Trees Compared. Beikircher, B. and Mayr, S. 31(11):1545–1556.
The Hydraulic Architecture of Juniperus Communis L. Ssp. Communis: Shrubs and Trees Compared [link]Paper  doi  abstract   bibtex   
Juniperus communis ssp. communis can grow like a shrub or it can develop a tree-like habit. In this study, the hydraulic architecture of these contrasting growth forms was compared. We analysed the hydraulic efficiency (leaf-specific conductivity, kl; specific conductivity, ks; Huber value, HV) and the vulnerability to cavitation (the water potential corresponding to a 50\,% loss of conductivity, Ψ50), as well as anatomical parameters [mean tracheid diameter, d; mean hydraulic diameter, dh; cell wall reinforcement (t/b)h2] of shrub shoots, tree stems and tree branches. Shrub shoots were similar to tree branches (especially to lower branches) in growth form and conductivity (kl = 1.93 ± 0.11 m2 s-1 MPa-1 10-7, ks = 5.71 ± 0.19 m2 s-1 MPa-1 10-4), but were similar to tree stems in their vulnerability to cavitation (Ψ50 = -5.81 ± 0.08 MPa). Tree stems showed extraordinarily high kl and ks values, and HV increased from the base up. Stem xylem was more vulnerable to cavitation than branch xylem, where Ψ50 increased from lower (Ψ50 = -6.44 ± 0.19 MPa) to upper branches (Ψ50 = -5.98 ± 0.13 MPa). Conduit diameters were correlated with kl and ks. Data indicate that differences in hydraulic architecture correspond to changes in growth form. In some aspects, the xylem hydraulics of tree-like Juniperus communis differs from that of other coniferous tree species.
@article{beikircherHydraulicArchitectureJuniperus2008,
  title = {The Hydraulic Architecture of {{Juniperus}} Communis {{L}}. Ssp. Communis: Shrubs and Trees Compared},
  author = {Beikircher, B. and Mayr, S.},
  date = {2008-11},
  journaltitle = {Plant, Cell \& Environment},
  volume = {31},
  pages = {1545--1556},
  issn = {0140-7791},
  doi = {10.1111/j.1365-3040.2008.01860.x},
  url = {https://doi.org/10.1111/j.1365-3040.2008.01860.x},
  abstract = {Juniperus communis ssp. communis can grow like a shrub or it can develop a tree-like habit. In this study, the hydraulic architecture of these contrasting growth forms was compared. We analysed the hydraulic efficiency (leaf-specific conductivity, kl; specific conductivity, ks; Huber value, HV) and the vulnerability to cavitation (the water potential corresponding to a 50\,\% loss of conductivity, Ψ50), as well as anatomical parameters [mean tracheid diameter, d; mean hydraulic diameter, dh; cell wall reinforcement (t/b)h2] of shrub shoots, tree stems and tree branches. Shrub shoots were similar to tree branches (especially to lower branches) in growth form and conductivity (kl = 1.93 ± 0.11 m2 s-1 MPa-1 10-7, ks = 5.71 ± 0.19 m2 s-1 MPa-1 10-4), but were similar to tree stems in their vulnerability to cavitation (Ψ50 = -5.81 ± 0.08 MPa). Tree stems showed extraordinarily high kl and ks values, and HV increased from the base up. Stem xylem was more vulnerable to cavitation than branch xylem, where Ψ50 increased from lower (Ψ50 = -6.44 ± 0.19 MPa) to upper branches (Ψ50 = -5.98 ± 0.13 MPa). Conduit diameters were correlated with kl and ks. Data indicate that differences in hydraulic architecture correspond to changes in growth form. In some aspects, the xylem hydraulics of tree-like Juniperus communis differs from that of other coniferous tree species.},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-3393637,juniperus-communis},
  number = {11}
}
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