The Heureka Research Programme - Mistra

and for prioritising and considering effects of fertilisation. Specificationsfor cleaning, stand establishment and early growth were handled in theproject. Furthermore, algorithms for calculating total volume from thinning,and proportions of volumes from non-prioritised thinnings and finalfelling for the application RegWise were documented.Continuous cover forestryFour types of alternative silvicultural methods/continuous cover forestrywere defined with accompanying silvicultural descriptions. The fourtypes described are: selection cutting in spruce stands, two-storied pinestands, urban forests and deciduous-rich marshes. The definitions includecriteria used to define suitable stand and site conditions for the differenttypes. These alternatives can be seen as default alternatives, while a useralso has the possibility to change them or define his or her own alternatives.Example, selection cutting in spruce stands.Potential stands/plots are defined by a spruce proportion >0.7, a field vegetationtype equal to Vaccinium myrtillus or better (i.e. indicative of a richer site)and stands/plots in the thinning or final felling stage.The diameter distributionshould be decreasing, i.e. the numbers of stems in four width classes (inwhich the width of the trees is at least a quarter of the width of the thickesttree on the plot) should successively decrease, as the width increases.The treatment is specified as a weak thinning from above. The so-called10§-curve in the Forestry Act defines the lowest allowable volume in thestand after cutting aiming at improving forest development. This curveis used as a guide curve. Thinning is performed when at least 30% of thevolume can be cut without falling below the curve, i.e. when V Act> 1.43V Min, where V Actis actual volume and V Minis volume from the guide curve.Nature preservation methodsNew approaches have been developed to promote nature conservation,involving conservation measures at three levels: stand level, groups of treesand the individual tree level. Different specifications are needed for the differentlevels. If information on an area for nature preservation is given in theinitial data, this area is referred to the corresponding forest domain, e.g. borderzones.Stand levelThe user can define forest domains to be kept for nature conservation, forinstance deciduous-rich stands, signified by > 60 % deciduous species inyoung forests and > 30 % in thinning and final felling stage. The standsare treated by promoting deciduous trees when thinned.Plot levelTwo cases are distinguished that are treated in different ways: border32