On the air permeability of Populus pit.
نویسندگان
چکیده
منابع مشابه
Cavitation fatigue. Embolism and refilling cycles can weaken the cavitation resistance of xylem.
Although cavitation and refilling cycles could be common in plants, it is unknown whether these cycles weaken the cavitation resistance of xylem. Stem or petiole segments were tested for cavitation resistance before and after a controlled cavitation-refilling cycle. Cavitation was induced by centrifugation, air drying of shoots, or soil drought. Except for droughted plants, material was not sig...
متن کاملModelling the mechanical behaviour of pit membranes in bordered pits with respect to cavitation resistance in angiosperms.
BACKGROUND AND AIMS Various correlations have been identified between anatomical features of bordered pits in angiosperm xylem and vulnerability to cavitation, suggesting that the mechanical behaviour of the pits may play a role. Theoretical modelling of the membrane behaviour has been undertaken, but it requires input of parameters at the nanoscale level. However, to date, no experimental data...
متن کاملChanges in pit membrane porosity due to deflection and stretching: the role of vestured pits.
The effect of increasing pressure difference (DeltaP) on intervessel pit membrane porosity was studied in two angiosperm tree species with differing pit architecture. Fraxinus americana L. possesses typical angiosperm bordered pit structure while Sophora japonica L. exhibits well-developed vestures in intervessel pit chambers. It was hypothesized (a) that large DeltaP across intervessel pits wo...
متن کاملLinking irradiance-induced changes in pit membrane ultrastructure with xylem vulnerability to cavitation.
The effect of shading on xylem hydraulic traits and xylem anatomy was studied in hybrid poplar (Populus trichocarpa x deltoides, clone H11-11). Hydraulic measurements conducted on stem segments of 3-month-old saplings grown in shaded (SH) or control light (C) conditions indicated that shading resulted in more vulnerable and less efficient xylem. Air is thought to enter vessels through pores in ...
متن کاملApplication of simulated annealing for optimization of blasting costs due to air overpressure constraints in open-pit mines
Estimating the costs of blasting operations is an important parameter in open-pit mining. Blasting and rock fragmentation depend on two groups of variables. The first group consists of mass properties, which are uncontrollable, and the second one is the drill-and-blast design parameters, which can be controlled and optimized. The design parameters include burden, spacing, hole length, hole diam...
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عنوان ژورنال:
- Computer methods in biomechanics and biomedical engineering
دوره 15 Suppl 1 شماره
صفحات -
تاریخ انتشار 2012