Applications of particle image velocimetry for seed release studies.

Abstract:

:Nonrandom seed release is an important determinant of how far seeds disperse, but the mechanisms that promote wind-related seed release under varying atmospheric conditions are poorly understood. We explored the use of particle image velocimetry (PIV) to gain a better mechanistic understanding of seed release by visualizing the flow velocities and vorticity in a two-dimensional slice of air around inflorescences. Pilot data taken in a wind tunnel show gradients in air velocity at the top of Carduus nutans capitula that may contribute to lift generation. Additionally, von Kármán vortex streets (vortices of opposite spin that are shed from the wake of an object) were observed shedding from capitula, which cause lateral forces on capitula and increase turbulence downwind at other locations. Avenues for further research include using PIV to examine the mechanisms of seed release and dispersal in wind tunnels and in the field. We found PIV to be a promising method to further explore the mechanisms behind seed release in wind dispersed plants, and a technique rich with opportunities for collaborations between plant dispersal ecologists and fluid dynamics specialists.

journal_name

Ecology

journal_title

Ecology

authors

Marchetto KM,Williams MB,Jongejans E,Auhl R,Shea K

doi

10.1890/09-0853.1

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

2485-92

issue

8

eissn

0012-9658

issn

1939-9170

journal_volume

91

pub_type

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