Agroecosystem biogeochemical cycling

Ellert, B. H., and Janzen, H. H. (2006). Long term biogeochemical cycling in agroecosystems inferred from nC and 1SN. J. Geochem. Explor. 88,198-201. 

Small catchments with similar soil and climate conditions and similar anthropogenic loading are most suitable for investigation of biogeochemical cycles in agroecosystems. The small catchment concept is widely used in European studies to evaluate the effects of different soil types, crops and management strategies on... 

In the major extent the natural biogeochemical cycle of nitrogen has been changed in agroecosystems. Discuss this problem by taking into acconnt the small catchment approach. 

System 13. soil-plant cycle soil-forming geological rocks (I) soil (IV) soil living matter (community of soil organisms) (V, VI, VII) aerosols, atmosphere air (12a, III) plants (VIII) their biological reactions, endemic diseases (VIII). In the complex system 13, the inner relationships and biochemical and biogeochemical mechanisms are shown for natural and agroecosystems. The system 11 and link IX show the ways for interrelation of system 13 with terrestrial animals. 

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