levels


h1. General
{section}{column:width=80%}
|| General characteristics || ||
| Common Name | Hydrophilous tall herb fringe communities of plains and of the montane to alpine levels |
| Region | Europe |
| Water system | Rivers and streams |
| Nature parameter | Habitat types |
| HR nr | H6430 |
| Fact sheet by | M. Haasnoot |{column}{column:width=20%}
{column}{section}

h1. Description habitat


h3. General occurrence

This habitat type H6430 is divided in type H6430A and H6430B.
Habitat type H6430A is defined as Hydrophilous tall herb fringe communities of plains and of the montane to alpine levels. 
This habitat is typically found on riverbanks, streams and ditches and desolate, humid grass lands. Characteristic species for this vegetation type are Longleaf speedwell and Marsh spurge. This vegetation type transfers rapidly into brush or swamp forest.
Habitat type H6430B is defined as hydrophilous tall herb fringe communities of plains and of the montane to alpine levels type B. This type occurs on the boundaries of low brackish to almost fresh waters, in marshes and freshwater tidal areas. Characteristic species are Marsh sow thistle, Marsh mallow and Common scurvy grass. This habitat is mostly found in The Netherlands. Some occurring species are becoming endangered, for instance because of the absence of tidal influence [#1].  

h3. Environmental conditions
The groundwater level is below surface level. The zone in which this type occurs floods rarely if ever. The habitat type is influenced by fresh water that has a chloride concentration of less than 0.25gCl/L ([#3], [#4], [#2], [#5]). It occurs near the mean water line and is regularly flooded. The salt content referred to in literature, differs per sub community, but if the content exceeds 5gCl/L ([#3] no community of this type occurs. 

h3. Control and growth opportunities

The most important control measurements are doing nothing or mowing incidentally. 

h1. Dose-effect relations
The dose-effect relations for habitat type H6430 have been divided in two sub type relations H6430A and H6430B as they have different habitat factors. Together, the suitable areas represent the area of H6430. 



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h4. Flow chart
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h4.