摘要：We analysed the frequency and biomass of submerged plants in 1490 samples taken from 10 lakes located in the same geological formation (outwash) and fed with surface water (1st lake group, n = 540 samples) or groundwater (2nd group, n = 950). In the first group, mosses were very frequent (mean ± SD = 90.0% ± 18.2%), while acidophilous vascular plants were less frequent (23.9% ± 32.5%) and their biomass was low. There was one dominant species: Sphagnum denticulatum. In the second group, calciphilous vascular plants and stoneworts were in the majority, with relatively higher frequencies (40.1% ± 25.2% and 59.7% ± 23.2%) and biomass (5.1 ± 6.5 and 13.8 ± 20.5 g DW 0.1 m–2). In the lakes fed with surface water, water pH was the factor controlling the frequency of mosses and vascular plants. In the group of lakes supplied with groundwater, sediment conductivity and calcium governed the frequency of stoneworts. Moss biomass depended on conductivity, total phosphorus and calcium concentrations in the water, while stonewort biomass depended on sediment conductivity. For both types of water supply, submerged plant frequency and biomass in the lakes were controlled more strongly by non-nutrient than by nutrient factors.
