The Selection of Seven New Clones from Eastern Cottonwood Seedlings at Jiangsu Province

This is the first time that seven new clones have been successfully selected from the eastern cottonwood seedlings introduced from North America in 1982 in China. Among the seven new clones, four clones are attributed to the southern ecotype whose characteristics of growth, adaptability, resistance and wood quality are superior to those of P. deltoides cv. 69/55 and P.euramericancc cv. 72/58. Those clones can be planted in the temperate zone and subtropic zone of China. The other three clones are the northern ecotype which have better characteristics of growth, adaptability, resistance and wood quality than those of P.euramericana cv. I-214. They can be planted in the moist northern and eastnorthern areas of China. Those new clones will be the good cultivars to be used for poplar plantations with short rotation.