Separation, preconcentration and speciation Organic phosphorus speciation in natural waters by mass spectrometry Abiotic degradation of organic phosphorus compounds in the environment Enzymatic hydrolysis of organic phosphorus Abiotic stabilization of organic phosphorus Microbial tumover of phosphorus in soil Organic phosphorus dynamics in tropical agroecosystems Organic phosphorus transfer from terrestrial to aquatic environments Interactions in terrestrial ecosystems Organic phosphorus in the aquatic environment: speciation, transformations and interactions with nutrient cycles