A study was made of the total pollen production per individual tree in ten anemophilous arboreal species (including wild, cultivated and ornamental species) of considerable aerobiological importance: Pinus pinaster, Ulniirs minor, Juglam regia, Platanics liispaniea, Quercus rotundiJolia, Salix atrveinerea, Populus nigra. Aeer negundo, Olea eiiropaea and Fraximts angustijolia.For each species three isolated well-shaped specimens of medium height were chosen, and the number of flowers per indibidual tree and the number of pollen grains per anther was estimated.The values of total pollen production varied between a little over 1000 million grains in Jiiglans regia and more than 500,000 million in one single tree in Quercus rotitiidifolia. For the production of pollen grains per anther, the values oscillated betneen 3000 grains in Jiigluiis regia and 100,000 in Olea europaea. There is an exponential correlation betaeen the size of the anthers and the number of pollen grains they contain. A linear correlation is also evident between the volume of the tree crown and the total production of inflorescences, floners, anthers and pollen grains per individual tree. Based on this, a mean coefficient of the number of grains/meter of diameter of the tree cronn is obtained which varies between 3.4 x 10' for Juglaiis regia and 550.9 x lo* for Qrtercus rotriridifolia. The ratio between the number of anthers per inflorescence and the number of pollen grains per anther carries out a hyperbolic function; thus, the inflorescences nith the most anthers have the anthers with the least pollen and vicewrsa. This ratio is also manifest between the number of grains per flower and the number of floaers per tree, as nell as the number of grains per inflorescence and the number of inflorescences per tree.
Two years of data from four longitudinal traverses along each day's slide prepared from a continuously running Burkard sporetrap have been analyzed statistically. Using the Friedman test, a statistically significant difference was found between the four traverses, with a greater than 7% loss of pollen grains in the two outer traverses in relation to the inner. Four slides were then selected for more detailed analysis, using 18 longitudinal traverses with a l-mm separation from the upper to the lower edge of the Melinex tape. There was found to be a progressive decline from the centre to the outside, and more than 4% of pollen grains were found outside the typical 14 mm width of the impaction orifice. There was no correlation between pollen grain size and the decline in counts from the centre to the outside. For the complete data set, there was a general rise in the diversity of pollen types with increasing sample counts, but above about 1000 pollen grains per sample there were no more than 27 pollen types found, often even fewer. A discussion is presented of whether four traverses really should be a fixing sample size, or whether it might be better to fix the total pollen count beginning with a traverse in the middle of the slide and ending with a variable number of traverses when that count is reached.
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