Test of Provenance Selection of Paulownia fortuneii at Nursery Stage in Northern Cultivation Border

The result of seedling test of Paulownia fortuneii conducted in Yanzhou City of Shandong Province showed that: 1.The difference of height and ground diameter of the saplings among different provenances was significant, and the influence of site on sapling height was greater than that on its ground diameter; 2.Temperature was the main controlling factor to its growth,of which,low temperature was the most important;3.At the 35°N northern cultivation border,the cultivars from Xinchun of Hubei Province and Luoshan of Henan Province were the more appropriate ones.