Analysis of forest soil chemistry and hydrology with a dynamic model ACIDIC.

Show simple item record Kareinen, Timo Nissinen, Ari Ilvesniemi, Hannu 2011-07-28T13:57:42Z 2011-07-28T13:57:42Z 1998
dc.identifier.citation Acta Forestalia Fennica. 1998. 262: 1-42. fi
dc.identifier.issn 0001-5636
dc.description.abstract In this study we analyze how the ion concentrations in forest soil solution are determined by hydrological and biogeochemical processes. A dynamic model ACIDIC was developed, including processes common to dynamic soil acidification models. The model treats up to eight interacting layers and simulates soil hydrology, transpiration, root water and nutrient uptake, cation exchange, dissolution and reactions of Al hydroxides in solution, and the formation of carbonic acid and its dissociation products. It includes also a possibility to a simultaneous use of preferential and matrix flow paths, enabling the throughfall water to enter the deeper soil layers in macropores without first reacting with the upper layers. Three different combinations of routing the throughfall water via macro- and micropores through the soil profile is presented. The large vertical gradient in the observed total charge was simulated succesfully. According to the simulations, gradient is mostly caused by differences in the intensity of water uptake, sulfate adsorption and organic anion retention at the various depths. The temporal variations in Ca and Mg concentrations were simulated fairly well in all soil layers. For H+, Al and K there were much more variation in the observed than in the simulated concentrations. Flow in macropores is a possible explanation for the apparent disequilibrium of the cation exchange for H+ and K, as the solution H+ and K concentrations have great vertical gradients in soil. The amount of exchangeable H+ increased in the O and E horizons and decreased in the Bs1 and Bs2 horizons, the net change in whole soil profile being a decrease. A large part of the decrease of the exchangeable H+ in the illuvial B horizon was caused by sulfate adsorption. The model produces soil water amounts and solution ion concentrations which are comparable to the measured values, and it can be used in both hydrological and chemical studies of soils. fi
dc.language.iso en fi
dc.publisher The Society of Forestry in Finland - The Finnish Forest Research Institute fi
dc.subject kationinvaihto fi
dc.subject alumiini fi
dc.subject huuhtoutuminen fi
dc.subject simulointi fi
dc.subject mallitus fi
dc.subject maaperä fi
dc.subject maavesi fi
dc.subject vesi fi
dc.subject cations fi
dc.subject ion exchange fi
dc.subject aluminium fi
dc.subject soil macropores fi
dc.subject soil micropores fi
dc.subject leaching fi
dc.subject simulation models fi
dc.subject soil water movement fi
dc.subject cation exchange, aluminium, macropores, micropores, leaching, simulation, modelling, water flow, flow paths fi
dc.title Analysis of forest soil chemistry and hydrology with a dynamic model ACIDIC. fi
dc.type Artikkeli fi
dc.identifier.laitoskoodi SMS fi

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