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COMPARATIVE RESEARCH ON GROWTH AND WOOD PROPERTIES BETWEEN ROTTEN POPLAR TREE AND NORMAL ONE ON FLOOD BEACHES ALONG YANGTZER RIVER Formation and Anatomical Characteristics of Tension Wood in Stem of Poplar I-107 Seedlings（Populus × euramericana cv. “74/76”） Inducted by Artifical Inclination Microfibril Angle, Basic Density and Longitudinal Shrinkage of Different Inclined Angles in Artificial Leaned Saplings of Poplar ‘Ⅰ-107’(Populus× euramericana ‘Neva’) Control of Negative Gravitropism and Tension Wood Formation by Gibberellic Acid and Indole Acetic Acid in Fraxinus mandshurica Rupr. var. japonica Maxim Seedlings Role of GA3, GA4 and Uniconazole-P in Controlling Gravitropism and Tension Wood Formation in Fraxinus mandshurica Rupr. var. japonica Maxim. Seedlings Ethylene Evolution Changes in Tilted Fraxinus mandshurica Rupr. var. japonica Maxim. Seedlings in Relation to Tension Wood Formation STUDIES ON THE PROPERTIES OF TENSION WOOD IN KALOPANAX SEPTEMLOBUS (THUNB. )KOIDZ Comparison of Quality of Pulping and Paper-Making between Normal Wood and Tension Wood of Poplar Clone 107 (Populus×euramericana ‘Neva’) Tree Pore Structure Characterization of Poplar Tension Wood by Nitrogen Adsorption-Desorption Method