An experimental study of momentum and heavy particle transport in a trellised agricultural canopy

摘要: Abstract Turbulent particle dispersion in plant canopies plays an important role many agricultural and forestry ecosystems. Most research on has focused dispersal patterns homogeneous dense and/or far from the source. To study near-source a sparse canopy, series of point-source release events was conducted commercial vineyard. Analysis wind velocity data indicated that majority flow open spaces between vine rows channeled parallel to regardless direction mean above canopy. Although this channeling led significant turning velocity, profiles turbulent statistics taken at times when above-canopy winds were nearly showed similar behavior canopy previous studies. The using fluorescent microspheres with physical characteristics spores multiple airborne fungal pathogens grapes (diameter = 10–45 μm, density 1.0 g/cm3). Microspheres released two vertical positions within monitored three dimensional impaction trap array region (1–5 heights downwind). shape microsphere plumes strongly impacted by Specifically, plumes’ maximum concentrations typically channelled down aisle which they originated. spanwise concentration profile also tended be skewed toward This believed caused directional shear created difference row as well filtering effects plants themselves.