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Variations in Amount and Ring Number of Sapwood and Heartwood of Pinus tabulaeformis STUDY 0lN CHEMICAL CHARACTERISTICS AND FORMATION MECHANISM OF POPLAR WETHEARTWOOD COMPARATIVE STUDIES ON THE PERMEABILITY BETWEEN THE SOLVENT- EXCHANGED AND THE AIR-DRIED WOOD Effects of Plant Growth Regulators on Growth, Heartwood Formation and Oil Composition of Young Santalum album Evaluation of Growth and Heartwood Formation of Young Sandal Plantations in Guangdong Province, South China Studies on chemical constituents in heartwood of Taxus cuspidata Spatial Variations in Stem Heartwood and Sapwood for Larix gmelinii Trees with Various Differentiation Classes Growth Characteristics of Heartwood and Sapwood of the Major Tree Species in Northeastern China Study on chemical constituents from heartwood of Caesalpinia sappan Study on chemical constituents from heartwood of Caesalpinia sappan STUDIES ON FORCING HEARTWOOD FORMATION IN SANTALUM ALBUM Effects of Provenances on Growth Characteristics of Sapwood and Heartwood of Larix gmelinii Trees Impacts of Tree Species and Tissue on Estimation of Nonstructural Carbohydrates Storage in Trunk The Effective Components Extraction and Antifungal Test for the Heartwood of Platycladus orientalis Chemical constituents in heartwood of Taxus yunnanensis Studies on the Occurrence, Distribution and Wood Properties of Wetheartwood in Populus deltoides I-69