Turbulence within and above a vegetation canopy flow is simulated using large-eddy simulation (LES). Pressure is calculated in the LES by solving a Poisson equation. Vorticity is derived from the three-dimensional velocity fields. Vortices are identified based on the pressure and the vorticity. Tilted Scalar microfronts, which features high scalar concentration gradient, are observed in the LES. Where a scalar microfront occurs, a high-pressure region is centered at the intersection of the scalar microfront and the canopy top. In the vicinity of the high-pressure regions, there exist sausage-like elongated low-pressure and high vorticity tubes, which indicate vortices. Most of the tubes tilt downstream with height. The relation between the sausage-like elongated vortices and the scalar microfronts is casual and inconsistent.