Studies on Introduction of Pinus sylvestris var. mongolica, P. sylvestriformis, P. densiflora and P. thunbergii

With the contrast of Pinus tabulaeformis, the introduction tests of P. sylvestriformis, P. densiflora, P. thunbergii and P. sylvestris var. mongo-lica, which included seven provenances, were conducted in three locations (elevation ranges 50-820 m) in Beijing mountain area. The results show that the growth of P. sylvestriformis is superior to that of P. tabulaeformis and the other pines have no advantage in comparison with P. tabulaeformis. There is significant variation among different provenances of P. sylvtstris var. mongolica in growth. The seed sources of Hulunberier, The Xiaoxinan Mountains and the southern part of The Daxinan Mountains are better than those of the northern part of The Daxinan Mountains.