期刊
ECOLOGICAL MODELLING
卷 186, 期 1, 页码 77-83出版社
ELSEVIER
DOI: 10.1016/j.ecolmodel.2005.01.051
关键词
wetlands; nitrogen; phosphorus; macrophytes; floating soils
类别
The N and P budgets in littoral floating soils - embalsados - of Ibera (Argentina) are here presented. The budgets were estimated from the differences in the total amounts of N and P in the aboveground biomass in February (summer) and August (winter), and the total amount of N and P in the floating soils sediments. Samples of vegetation - for aboveground biomass estimation - and of sediments were collected. The sediment samples were picked with a corer, and included roots, rhyzomes, detritus and inorganic material. The total P and total N concentrations were determined for the vegetation samples and the bioavailable P and total N concentrations were determined in the sediments. The results show that the aboveground biomass production gets less than 10% of the N content of the sediments. There is a decrease in the total amount of N in the sediments during the growing period. This observation can be partly explained by lacking data from non-estimated compartments, like the grazed aboveground biomass and the increment of the belowground biomass. Other possible fates for N would be losses by denitrification and lixiviation to the lagoon. The N:P ratio in the biomass indicates a deficiency of N, which is consistent with the negative N balance estimated for the embalsado. With respect to bioavailable P, a negative balance between winter and summer was also found. This was not the case for total P. The significant decrease of bioavailable P in depth in the embalsado suggests a net flow towards the lagoon along the growing season. (c) 2005 Elsevier B.V. All rights reserved.
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