By Geert Van Wirdum

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Marchica Site indication by quagfen flora 45 The seepage influence is much less strongly indicated, however, by the explicit group of Dutch seepage indicators. 4. It is worthy of note that, in the quagfen situation, surface water usually reaches the root zone by penetration below the floating kragge, where it should be able to acquire a physico-chemical character similar to the ‘groundwater’ described by Eurola et al. 46 Site indication by quagfen flora Reprinted from: Geert van Wirdum, 1990. Vegetation and hydrology of floating rich-fens.

The chemical composition in this body of water is rather constant in some cases, but in other ones it varies considerably, both within and between years. The kragge is in fact the most important ‘storage organ’ of a quagfen and the extent of the rhizomes of several species make it a more or less homogeneous base upon which other patterns become superimposed (levels 2-4). The kragge-forming plants contribute to a translocation of elements from the environment underneath the kragge to the fen surface, and they provide shade, micro-relief, and substratum for smaller plants.

In species-rich calcareous fens with a considerable micro-relief, Dierssen was probably unable to meet the minimum area requirement but he used 1 m2 plots for reasons of homogeneity. Some of the divergence among various schemes of classification (Appendix B) is attributable to the implicit use of different concepts of uniformity. 1 The concept of AND and OR Associations According to the OR theorem (B) the milieu of an Association is the union of the milieus of the various associated species rather than their overlap area, as prescribed by the AND theorem (A); hypothetical example.

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Vegetation and Hydrology of Floating Rich-Fens by Geert Van Wirdum
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