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Dataset information

Italian mountain lake dataset

EDDI dataset codeALPI
Dataset typepH
Number of samples31
Collection date1989 - 1990
ContributorAldo Marchetto
ContactAldo Marchetto

Surface sediment samples and lakewater chemical data from thirty-one high mountain lakes were used to derive a lakewater pH transfer function. The lakes selected lie along a pH gradient on the southern side of the Central Alps in South Tyrol, in the Ossola Valley, Italy and in Canton Ticino, Switzerland. The lakes selected are small (up to 0.2 km2) clearwater lakes most of which are located above the timberline. Samples were collected using gravity corers and the surface (0-0.5cm) was used to prepare a diatom sample. A total of approximately 600 diatom valves per sample was counted.

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  • Summary of environmental data for this dataset:
    VariableUnitsNMinMaxMean
    Alkalinity畫q/l31063078.2
    Ammonium痢/l30060001367
    Calcium畫q/l3126519114
    Chloride畫q/l310104.55
    Conductivity猶/cm318.374.420.6
    Magnesium畫q/l31622228.7
    Maximum depth of lakem312288.32
    Nitrate痢/l3110004100018516
    pHpH units315.37.96.3
    Potassium畫q/l313489.52
    Silicamg/l310.191.450.704
    Sodium畫q/l3152615.7
    Sulphate畫q/l313419873.4
    Total phosphorus痢/l312437.26
    Water depth of diatom samplem312288.32

    Publications for this dataset:

    Marchetto, A. & R. Schmidt, 1993. A regional calibration data set to infer lake water pH from sediment diatom assemblages in alpine lakes. Mem.Ist. ital. Idrobiol. 51: 115-125.