Shallow Ponds as Sediment and Nutrients retainers, Buenos Aires province, Argentina.

PERILLO, GERARDO M. E.; BOHN, VANESA Y; GERALDI, ALEJANDRA; PICCOLO, M CINTIA

Egmond aan Zee.

Congreso; LOICZ II Inaugural Open Science Meeting.; 2005

LOICZ

The trophic state of the shallow lakes in Buenos Aires province is influenced by hydrologic conditions and the characteristics of the soils. Most of these water bodies belong to endorreic basins. The alternation of periods drought and flood has generated fluctuations in the physical, chemical and biologic parameters of these ponds. The main object of this research is to determine the contribution of this water bodies in Ihe stability of global levels of available nitrogcn (N), p1~ospliorous (P), carbon (C) and sediments. Data from shallow lakes of the soutllern Buenos Aires Province south ("pampean shallow lakes") were employed. The retention of C N and P was evaluated trough the analysis of the particulate organic matter decomposition. in different oxidation states, several of which are important in the chemistry of the lagoon. The interpretation and analysis of satellital images showed that tlle slialiow lake areas increased in tlie last years. Finally, P, N and C retention was considered one of the ii~ost itiiportant attributes of the "Pampean shallow lakes". The nature of the "pampean" basin (without drainage) increased [lie concentrations of these elements along the tirne.