ISSN:
1573-2932
Keywords:
biomass production and elemental uptake
;
groundwaterchemistry
;
manuring and fertilizing
;
water-rock and water-soil interactions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Abstract Using a combination of a grouping algorithm and a geochemical mole balance algorithm, we could identify and quantify the contributions made by water-rock and water-biomass interactions to the composition of shallow groundwaters in northern Portugal, in an area with a sizable anthropogenic input (the Chaves-Vila Pouca de Aguiar region). The first algorithm, based on the mathematical concept of equivalent relations, allows for the grouping of water samples with similar chemistries. The second algorithm, which uses the stoichiometries and mole/charge balances in weathering reactions and biological processes, provides the possibility to relate the average chemistry of each identified group to water-mineral and water-biomass interactions. This algorithm hinges on ratios of dissolved silica and bicarbonate, constituents considered to be derived only from chemical weathering and biomass production. Background information on the petrology, mineralogy and chemistry of bedrocks and soils, on climatic differences, on the history of deforestation and reforestation of the study area, and on the application and composition of fertilizers and manure, was used to identify the most realistic weathering reactions and biological processes which contribute to the water chemistry. The concentrations of chloride, sulphate and nitrate were considered to represent sources other than chemical weathering or biomass changes, like cyclic salts, fertilizers and manure. Despite the high background concentrations derived from such sources, we were able to quantify the contributions of the identified weathering reactions and botanical uptake to the groundwater composition. The spatial distributions of the various groundwater groups shows a good correlation with the geology, land use and climatic differences in the area.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1005119121666
