caa a22 4500 465757049 CHVBK 20180323111850.0 cr unu---uuuuu 170327e19900301xx s 000 0 eng 10.1007/BF00177282 doi (NATIONALLICENCE)springer-10.1007/BF00177282 Dynamic hydrochemical and vegetation gradients in fens [Elektronische Daten] [Willem Koerselman, Domien Claessens, Paul ten Den, Erik van Winden] The mixing of groundwater, river water and precipitation was studied in a discharge and a recharge fen in the Vechtplassen area, the Netherlands. The aim of the study was to characterize relationships between vegetation in fens, the chemical composition of the fen water, and the hydrologic regimes. We were particularly interested in the influence of polluted water from the river Vecht on vegetation and nutrient dynamics. Analyses were made for Ionic Ratio (IR = 2[Ca]/(2[Ca] + [Cl]), molar concentrations) and Electrical Conductivity (EC), all indices of the relative importance of each of the three main water sources: groundwater, river water and precipitation. During winter, water in the discharge fen was strongly influenced by calcium-rich groundwater (high IR, moderate EC), while the recharge fen was entirely fed by precipitation (low IR and EC). During summer, river water with a moderate IR and high EC infiltrated the fens and caused a dramatic change in the chemical composition of the fen water. In the discharge fen, infiltration occurred predominantly as sheetflow, causing inundation of the entire fen surface. River water infiltration affected the surface peat of this fen more severely than deeper peat layers. Spatial variation in water chemistry along the transect was small, and only one type of plant community was found. In the recharge fen, river water infiltration occurred in subsurface water, and rainwater that had accumulated during the winter persisted in the central parts of the fen. Gradients in fen water chemistry were correlated with the observed distribution of three plant associations. Differences in water chemistry could also be attributed to intra-site variation in the relative importance of the three water sources. In both fens, there was considerable temporal variation in the chemical composition of the fen water, clearly related to dynamics of the hydrologic regime, particularly infiltration of river water. There are indications that characteristic mesotraphent fen plant communities are negatively affected by water from the river Vecht. River water supply should therefore be avoided as much as possible if these fen plant communities are to be maintained. SPB Academic Publishing bv, 1990 hydrochemistry nationallicence ecotones nationallicence Ionic Ratio nationallicence Electrical Conductivity nationallicence fens nationallicence hydrology nationallicence vegetation composition nationallicence Koerselman Willem Department of Plant Ecology, The University of Utrecht, Lange Nieuwstraat 106, 3512, PN Utrecht, The Netherlands aut Claessens Domien Department of Plant Ecology, The University of Utrecht, Lange Nieuwstraat 106, 3512, PN Utrecht, The Netherlands aut ten Den Paul Department of Plant Ecology, The University of Utrecht, Lange Nieuwstraat 106, 3512, PN Utrecht, The Netherlands aut van Winden Erik Department of Plant Ecology, The University of Utrecht, Lange Nieuwstraat 106, 3512, PN Utrecht, The Netherlands aut Wetlands Ecology and Management Kluwer Academic Publishers 1/2(1990-03-01), 73-84 0923-4861 1:2<73 1990 1 11273 https://doi.org/10.1007/BF00177282 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00177282 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Koerselman Willem Department of Plant Ecology, The University of Utrecht, Lange Nieuwstraat 106, 3512, PN Utrecht, The Netherlands aut NATIONALLICENCE 700 1- Claessens Domien Department of Plant Ecology, The University of Utrecht, Lange Nieuwstraat 106, 3512, PN Utrecht, The Netherlands aut NATIONALLICENCE 700 1- ten Den Paul Department of Plant Ecology, The University of Utrecht, Lange Nieuwstraat 106, 3512, PN Utrecht, The Netherlands aut NATIONALLICENCE 700 1- van Winden Erik Department of Plant Ecology, The University of Utrecht, Lange Nieuwstraat 106, 3512, PN Utrecht, The Netherlands aut NATIONALLICENCE 773 0- Wetlands Ecology and Management Kluwer Academic Publishers 1/2(1990-03-01), 73-84 0923-4861 1:2<73 1990 1 11273 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer