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THE COMPETITION-DENSITY EFFECT IN POPULUS × EURAMERICANA CV.‘SAN MARTION‘ PLANTATIONS Survival and Juvenile Growth of Populus ×euramericana (Dode) Guineir cv.‘Neva’ Cuttings from Stem and Branch of Different Parent Shoots and Planting Spaces Selecting and Breeding of Transgenic Clones of Populus euramericana‘MR3’by Insertion of Multiple Genes Isolation and Expression Analysis of DNA Methyltransferase Fragments in Populus×euramericana Establishment of an Efficient Regeneration System of Populus×euramericana cl. ‘Bofeng 1’ Absorption and Distribution of PM_2.5 NH₄⁺ and NO₃^- in Populus euramericana Neva. The Impact of Poplar Diameter Characteristics on Disease Index of Canker Effects of Cadmium Stress on Leaf Photosynthesis and Dry Matter Allocation of Populus×euramericana (Dode)Guineir cv.‘Neva’ Absorption and Accumulation of Heavy Metal from Soil by Leaves of Populus×euramericana cv. ‘Neva’Plantation Predominant Species Dynamic and Diversity of Fungal Endophytes in Barks of Populus×euramericana THE SELECTION AND BREEDING NEW POPULUS EURAMERICANA CLONES-ZHONGBAO NO.28, ZHONGBAO NO.115, ZHONGBAO NO.95 Characterization and Expression of PeMYBF1 Encoding a R2R3-MYB Transcription Factor from Populus euramericana Transformation of Zinc Finger Protein Transcription Factor Gene (ZxZF) and Preliminary Evaluation of Drought Tolerance in Populus × euramericana Ion Fluxes of Multiple Transgenic Populus×euramericana‘Guariento’ under Salt Stress PRELiMINARY STUDlES ON RADlAL VARlATION PATTERNS OF WOOD PROPERTIES WITHIN TREES IV．STUDIES ON THE RADIAL VARIATION PATTERNSOF WOOD DENSITY IN POPULUS×EURAMERICANA CLONES STUDlES ON INSECT-RESISTANT TRANSGENlC (P．×EURAMERICANA)PLANTS Cloning and Identification of PAL Gene Amplified by RT-PCR from Populus×euramericana cv.“74/76” Second Xylem mRNA Physiological regulations of photosynthesis in a poplar plantation on a sandy soil Salt tolerance of transgenic poplar by the introduction of AtNHX1 gene Effects of drought stress on the growth, photosynthetic characteristics, and active oxygen metabolism of poplar seedlings. A Study on Distribution of Root System of Populus×euramericana cv. ‘74/76’ Plantation with Ground Drip Irrigation Molecular Cloning and Function Analysis of PtSIP3 Gene from Populus×euramericana cl.‘Zhonglin 46’Triploid POPIAR INTRODUCTION AND SELECTION IN THE COLD SEMIARID AREA OF THE NORTH CHINA RESEARCH ON THE ROOTING PROPERTIES OF THE NEW CLONES OF POPULUS EURAMERICANA THE EFFECT OF FERTILIZATION IN POPULUS EURAMERICANA CV. Ⅰ-214 FOREST LAND PCR ANALYSlS OF TRANSGENOSIS (P.×EURAMERICANA)PLANTS A PRIMARY STUDY ON THE RADIAL VARIATION PATTERNS OF WOOD PROPERTIES WITHIN TREES V.THE RADIAL VARIATION PATTERNS AND ITS VARIATION OF WOOD FIBRE LENGTH OF 15 CLONES OF POPULUS×EURAMERICHANA Variation of Wood Qualities along Tree Height and Growth and Correlation Analysis of Multiple-traits in Poplar Hybrid Transformation of BG₂ Gene into Populus×euramericana cv.‘Neva’and Resistance of the Transgenic Poplar to Canker Disease Anmylsis on Effect and Stability of the Regional Test of Populus × euramericana Clones Analysis on Insecticidal Activity of Bt Transgenic Populus deltoides × P. euramericana cv‘Nanlin895’and Its Effects on Soil Microorganism The Input-Output and Financial Maturity for Poplar Plantations Study on the influencing factors of callus inducement and plant regeneration of Populus euramericana in vitro Poplar Transgenic System by Using PMI as Biosafety Selective Marker In vitro micropropagation of insect-resistant transgenic Populus euramericana Exogenous Gene Expression on Transgenic Populus×euramericana cv. ‘74/76‘ Carrying Bivalent Insect-Resistant Genes The Effect of Compound Preparation Made by Ectomycorrhizal Fungus and Hormone on the Growth and Disease Resistance of Poplar Cuttings Genetic Analysis ofClonal Growth Traits in Gene-Pool of Black Popular Study on the Difference in Expression Profiles of microRNA Among Leaf Organs of Triploid and Diploid Populus×euramericana cl.‘Zhonglin46’ Populus×euramericara cv. ‘74/76’ Nutrient Content and Soil Fertility Affected by Application of Humic Acid with Inorganic Fertilizers Primary Study on Decomposition of Lignin of Poplar ‘I-107’by Trametes trogii WT-1 Variation of Leaf Area in Individual Tree for Poplar Shelterbelts Effects of Stand Density on Growth of Populus×euramericana’Neva’ Plantations Responses of Poplar (Populus×euramericana cv. Effects of Exogenous Ca²⁺ on Growth and Dynamic Distribution of Stable Isotope δ¹³ C,δ¹⁵ N of Populus×euramericana‘Nanlin 895‘ Cuttings Pathogen identification of Populus × euramericana Canker Disease Transformation of Drought and Salt Resistant Gene ( DREB1C ) in Populus×euramericana cv. Nanlin 895 Microfibril Angle, Basic Density and Longitudinal Shrinkage of Different Inclined Angles in Artificial Leaned Saplings of Poplar ‘Ⅰ-107’(Populus× euramericana ‘Neva’) Variation of Branch Surface Area in Individual Tree for Poplar Shelterbelts Short-Term Effects of Root Pruning on Photosynthetic Characteristics and Growth of Populus×euramericana cv. ‘Neva’ A Study on the Selective Breeding Potentiality of the F₁ Hybrids between the Cultivars of Populus deltoides and P. euramericana