The model of tending technique on recreational forest of Platycladus orientalis in Beijing mountainous area.

In order to study the suitable composition of the middle-aged recreational forest of Platycladus orientalis on thick soil of Beijing low mountainous area,its in-forest landscapes are evaluated by scenic beauty estimation(SBE) method in this paper.The multivariate linear models for estimation and forecast on landscape quality between favor degree and the structural factors of in-forest landscape are established using Quantitative Theory Ⅰ,then the models of tending techniques are educed.The study shows that the scenic quality of the P.orientalis recreational forest should be improved by quantitative tending techniques,such as pruning dead branches and lower alive branches,cutting shrubs,thinning and so on.After being tended,the perfect P.orientalis recreational forest on sunny slope should be such woodlands with the forest density about 1 750 stems/hm~2,the canopy density about 0.8,the height and coverage of shrub below 1.0 m and 50% respectively,the height of alive branches about 4.0 m,vegetaion change under the canopy to a certain extent and without deadwood.The perfect P.orientalis recreation forest on shady slope should be such woodlands with the forest density below 1 000 stems/hm~2,the canopy density about 0.8,the height and coverage of shrub below 0.5 m and 30%～50% respectively,the height of alive branches about 4.0 m,a less change of vegetation under the canopy and without deadwood.