Geographic Variation and Provenance Selection of Pinus tabulaeformis

The provenance test of Pinus tabulaeformis,including 36 seed sources,was conducted in 4 locations in Gansu Province.The results show that there are significant differences in growth among the provenances and the interactions between provenances and sites are also significant.Based on the growth performance,the provenances of Pinus tabulaeformis are divided into three growth-types,e.g.fastgrowing type,middle-growing type,low-growing type.The provenances from Shanxi and Henan Province are suitable because of their fastgrowth and stable performance.The provenances from the border of the distribution of Pinus tabulaeformis have unstable performance and lowgrowth.