ABSTRACT
A rich experience of reclamation of forested wetlands for use in forestry has accumulated in a number of countries. Forested wetlands can be divided into two main groups. The first group represents wetlands with temporary, recurrent moisture surplus, for which there may be either no peat formation or only thin peat layers. The second group represents wetlands with constant moisture surplus, which leads to peatland formation. Drainage for forestry is carried out by a system of open ditches. Its regulative role is limited, especially on wet mineral soils where the level of groundwater drops below the bottom of the ditches, except for spring flooding periods. Drainage creates a different water regime through the area; the water level in the interditch profile has the shape of an “arch” that influences tree stand productivity. The general approach of maintaining an average level within certain limits is considered as quite satisfactory for a drainage norm.
