Abstract: The paper deals with the growth performances of different ecotypes of Pinus tabulaeformis in three different elevation sites in Beijing mountain area. The 7-year-old results show that there are significant differences in growth performances among the ecotypes and the interaction between ecotype and site is also significant. In the sites below the elevation of 800 metres, the eastern ecotype is best because of its fast-growth and stable performances. The eastern ecotype, the central ecotype and the central-western ecotype are suitable for the sites with the elevation of 800-1200 metres. In the sites above the elevation of 1200 metres, the eastern ecotype and the north-eastern ecotype grow fast and have better performances. According to the results, it was put forward that the elevation differences between both the sites and the seed origins may not be considered if the seeds from the eastern ecotype are adopted in Beijing mountain area. Additionally, the seeds from the central ecotype and the central-western ecotype could be adopted in the sites with the elevation of 800-1200 metres as well as the seeds from the north-eastern ecotype in the sites above the elevation of 1200 metres on the condition that the seeds are in short supply.

Key words: Pinus tabulaeformis, Ecotype, Provenance test, Ecotypexalititude interaction