Bog pond

Brown bog ponds are surrounded by peat and receive their water exclusively from precipitation or from the large rain storage capacity of raised bogs.

Such kolks generally represent the non-evaporating excess water of a bog.

Usually the edges of the kolk are more nutrient-rich as a result of mineralisation processes caused by wave and wind action.

Here woody plants, such as downy birch (Betula pubescens), and other species of plant, e.g. purple moor grass (Molinia caerulea), may establish, that otherwise are missing on the central areas of intact bogs.

The bog water is brown, nutrient-poor, humic acid rich, and lime-free (dystrophic).