Kees Dijkema

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The conquest of land from the sea has been a long tradition in the Netherlands. When salt marshes were high enough, they were embanked when it was economically feasible, and transformed into intensively exploited agricultural land. This resulted in the transformation of halophytic communities to glycophytic communities. Often as an alternative, a low levee,(More)
The area of salt marshes does no longer increase. The recent erosion coincides with a rise in MHT-level in the last 25 years. Despite the decrease in area, sedimentation continues, especially in the lower salt marsh, which acts as a sink of nitrogen. Assimilation and mineralization of nitrogen are in balance in most plant communities along the gradient from(More)
The salt marshes of nearly the entire mainland coast of the Wadden Sea have been developed with the support of land reclamation techniques, originally with the purpose of embankments. At present land reclamation works (foreland works) are still maintained to protect the salt marshes against erosion. The maintenance should be continued in a way as natural as(More)
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