Abstract
A study was made of the physical and chemical features of the ricefields from «La Albufera» (East Spain) with a view to improving the understanding of this complex ecosystem. The results show the association of the measured variables in 3 factors: water mineralization, biological (photosynthetically) related variables, and the nutritional factor, including P and N concentrations. Water mineralization variables were the most descriptive for each type of system. Calcium concentration can discriminate groups of water qualities in this system. Mineralization variables increased through the crop. On the other hand the biological factor showed a very close relationship with photon flux density variation along the crop; dissolved O 2 and pH decreased, but CO 2 increased. The nutritional factor indicated elevated mean values for nutrients (N and P), but did not show an unique pattern of variation, indicating the strong influence of agricultural fertilization on the physicochemical features
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