Premium
Ecological implications of xylem cavitation for several Pinaceae in the Pacific Northern USA
Author(s) -
Piñol J.,
Sala A.
Publication year - 2000
Publication title -
functional ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.272
H-Index - 154
eISSN - 1365-2435
pISSN - 0269-8463
DOI - 10.1046/j.1365-2435.2000.t01-1-00451.x
Subject(s) - xylem , cavitation , biology , pinaceae , evergreen , botany , deserts and xeric shrublands , resistance (ecology) , water transport , woody plant , hydraulic conductivity , ecology , horticulture , habitat , soil water , pinus <genus> , water flow , environmental science , soil science , physics , mechanics
1. Xylem hydraulic properties and vulnerability to cavitation (determined using the air‐injection method) were studied in six Pinaceae of the northern Rocky Mountains: Pinus ponderosa , Pseudotsuga menziesii , Larix occidentalis , Pinus contorta , Pinus albicaulis and Abies lasiocarpa . We tested whether species extending into drier habitats exhibited increased resistance to water stress‐induced cavitation, and whether there is a trade‐off between xylem transport capacity and resistance to cavitation. 2. At lower elevations the more drought‐tolerant P. ponderosa was much less resistant to cavitation than the codominant P. menziesii . Greater vulnerability to cavitation in P. ponderosa was compensated for, at least in part, by increased stomatal control of water loss (inferred from carbon isotope discrimination) and by increased sapwood to leaf area ratios. Similar differences, but less pronounced, were found in codominant species at higher elevations. 3. Leaf specific hydraulic conductivity was negatively correlated with mean cavitation pressure. When species were separated into pines and non‐pines, sapwood specific conductivity and mean cavitation pressure were also negatively correlated within each of the two groups. 4. Our results indicate that within the evergreen conifers examined, greater resistance to water stress‐induced cavitation is not required for survival in more xeric habitats, and that there is a trade‐off between xylem conductance and resistance to cavitation.