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Beneficiado por condiciones agroecologicas, el Cinturon Horticola Marplatense (CHM) se posiciona como uno de los principales abastecedores de hortalizas de hoja y fruto al resto del pais. El avance e intensificacion de la actividad horticola en el area resulta evidente en las ultimas decadas. En este contexto, surgen diversos problemas ambientales derivados, principalmente, del amplio uso de plaguicidas. En este marco, el presente trabajo propone evaluar comparativamente el impacto potencial de contaminacion por plaguicidas para dos casos de estudio en sistemas bajo cubierta y dos casos a campo dentro del CHM. Luego, identificar las posibles implicancias que la dependencia de estos insumos genera sobre los servicios ecosistemicos (SE) y, por ultimo, plantear estrategias de manejo para preservar estos servicios. De acuerdo a los casos analizados, el sistema bajo cubierta obtuvo valores mas elevados (0,15 y 0,18), que el sistema a campo (0,01 y 0,03) respecto a su potencial de contaminacion. Los SE mayormente comprometidos serian los de polinizacion; control de plagas, enfermedades y malezas; fuente de alimento y hospedaje para especies beneficas; provision de alimentos, y provision de agua para consumo humano. En este sentido, es posible implementar estrategias que permitan combinar la conservacion de los ecosistemas con la obtencion de beneficios economicos. Finalmente, se considera importante avanzar sobre el analisis de nuevos casos para alcanzar una evaluacion completa del sistema, y profundizar en propuestas tendientes a la sustentabilidad de los agroecosistemas. Palabras clave: Intensificacion horticola, Problemas ambientales, Planificacion ambiental. Abstract Benefited by agro-ecological conditions, the “ Cinturon Horticola Marplatense (CHM)” [Marplatense Horticultural Belt] is positioned as one of the main suppliers of leaf and fruit vegetables to the rest of the country. The advance and intensification of the horticultural activity in the area is evident in the last decades. In this context, several environmental problems arise, mainly due to the wide use of pesticides. Within this framework, the present work proposes to evaluate comparatively the potential impact of contamination by plaguicides for two cases of study in greenhouse systems and two cases in open field inside the CHM. Then, identify the possible implications that the dependence of these inputs generates on ecosystem services (ES) and, finally, propose management strategies to preserve these services. According to the analyzed cases, the greenhouse system obtained higher values (0.15 and 0.18) than the open field system (0.01 and 0.03) in relation to its contamination potential. The most compromised ES would be pollination; pests’ control, diseases and weeds; food source and hosting for beneficial species; food supply, and provision of safe drinking water. In this sense, it is possible to implement strategies that allow combining the conservation of ecosystems with the attainment of economic benefits. Finally, it is therefore considered important to advance on the analysis of new cases to achieve a complete evaluation of the system, and expound on proposals tending to the sustainability of agroecosystems. Keywords : Horticultural intensification, Environmental problems, Environmental planning.

caderno de geografia

Plaguicidas en el Cinturón Hortícola Marplatense, Buenos Aires, Argentina: servicios ecosistémicos comprometidos y estrategias de manejo / Plaguicides in the Marplatense Horticultural Belt, Buenos Aires, Argentina: ecosystem services compromised and management strategies