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Forests are complex ecosystems characterized by several distinctive vertical layers with different functional properties. Measurements of CO 2 fluxes by the eddy-covariance method at different heights can be used to separate sources and sinks in these layers. We used meteorological and eddy-covariance flux data gathered at 10 sites in the FLUXNET network across a wide range of forest type,...
A simple method for measuring the settling velocity (Vs) distribution of pollen and spores 30–100 μm in diameter is detailed and evaluated. The method is called the ‘settling tower' and consists in taking sequential pictures of particles falling under gravity in calm air. The scene is illuminated by a cold light source, while a camera takes 15 pictures per second. Between 20,000 and 100,000 images...
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