Abstract:

In-forest landscapes of the middle-aged recreational forests of Pinus tabulaeformis on thick soil of Beijing lower mountainous area were evaluated by SBE method (scenic beauty estimation method)and the multivariate linear models for landscape evaluation and forecast between favor degrees and the factors of in-forest landscape were established using Quantitative Theory I in this paper．The suitable structure and the models of tending techniques of this kind of recreational forests were educed．The study shown that the scenic quality of the recreational forest of P．Tabulaeformis should have been enhanced by quantitative tending techniques，including pruning dead branches and alive branches，cutting shrubs，thinning and so on．After tending，the perfect recreational forest of P．Tabulaeformis in sunny slope should be with tree density below 1 100 tree·hm^-2，the canopy density about 0.8，the height and coverage of shrub about 1.5 m and 30%，the height of alive branches between 2.5～4.0 m，a small change of vegetation under the canopy, and without deadwood．The perfect recreational forest of P．Tabulaeformis in shady slope should be with the tree density about 1500 tree·hm^-2,the height and coverage of shrub below 1.0 m and 50%．The height of alive branches between 2.5～4.0 m．And without deadwood．The results of this paper should expect to offer the theory and techniques support of sustainable management of the middle-aged recreational forests of P．Tabulaeformis in Beijing mountainous area，and also for reference to similar area of north of China．

Key words: Pinus tabulaeformis, recreational forest, scenic beauty estimation method (SBE), mode of tending techniques