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Study on the Sa lt Tolerance of Genetica llyMod if ied Tr iplo idChineseWhite Poplar Expression Ana lysis of N eom yc in Phosphotransfe rase II (N PT II)Gene in Multigenes Transgen ic Poplar TheWood Qua lity Character istics and the Biopulping Fea sibility ofM in irota tion Coppice Shoot of Poplar Establishment of Tissue-Culture Regeneration System in the Hybrid Poplar 110 Transpira tion Var ia tion of the Poplar Shelterbelts and Its Rela tion to theMeteorolog ica l Factors in the Cropland of North China Plain